Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

> 
> manfred@colorfullife.com said: 
> > IRR for interrupt 19 is set, that means the IO APIC has sent the 
> > interrupt to a cpu but not yet received the corresponding EOI. 
> 
> OK, but couldn't we reset it by sending an extra EOI when the drivers 
> decide that they've missed interrupts? 

How?
You send an EOI by writing 0 to the EOI register of the local apic, and
then the local apic automagically checks it's ISR bitfield.
It takes the highest set bit and clears it. Then it checks that bit in
the TMR, and it if's also set in the TMR then it sends an EOI to the IO
apic.

The magic seems to be tamper proof: all bits are read only.

The bit on the IO apic is also read only.
Perhaps with brute force? Switch the interrupt to edge triggered on the
io apic, wait 1 usec, switch it back to level triggered. The IRR bit is
undefined for edge triggered interrupts, perhaps that clears the IRR
bit.

I would first concentrate on the differences between 2.2 and 2.4:

Frank, could you try what happens with the NMI oopser disabled?

The second major difference I'm immediately aware of is the number of
the reschedule/tlb flush/etc interrupt: 2.2 uses the lowest priority,
2.4 the highest priority.

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 06:16:36PM +0100, Manfred Spraul wrote:
> I would first concentrate on the differences between 2.2 and 2.4:
> 
> Frank, could you try what happens with the NMI oopser disabled?

Here's the results with nmi_watchdog=0

Before network hang (nmi_watchdog=0)
====================================
Jan 12 18:24:43 behemoth kernel: SysRq:
Jan 12 18:24:43 behemoth kernel: print_PIC()
Jan 12 18:24:43 behemoth kernel:
Jan 12 18:24:43 behemoth kernel: printing PIC contents
Jan 12 18:24:43 behemoth kernel: ... PIC  IMR: fffa
Jan 12 18:24:43 behemoth kernel: ... PIC  IRR: 0000
Jan 12 18:24:43 behemoth kernel: ... PIC  ISR: 0000
Jan 12 18:24:43 behemoth kernel: ... PIC ELCR: 1e00
Jan 12 18:24:43 behemoth kernel: print_IO_APIC()
Jan 12 18:24:43 behemoth kernel: number of MP IRQ sources: 23.
Jan 12 18:24:43 behemoth kernel: number of IO-APIC #2 registers: 24.
Jan 12 18:24:43 behemoth kernel: testing the IO APIC.......................
Jan 12 18:24:43 behemoth kernel:
Jan 12 18:24:43 behemoth kernel: IO APIC #2......
Jan 12 18:24:43 behemoth kernel: .... register #00: 02000000
Jan 12 18:24:43 behemoth kernel: .......    : physical APIC id: 02
Jan 12 18:24:43 behemoth kernel: .... register #01: 00170011
Jan 12 18:24:43 behemoth kernel: .......     : max redirection entries: 0017
Jan 12 18:24:43 behemoth kernel: .......     : IO APIC version: 0011
Jan 12 18:24:43 behemoth kernel: .... register #02: 00000000
Jan 12 18:24:43 behemoth kernel: .......     : arbitration: 00
Jan 12 18:24:43 behemoth kernel: .... IRQ redirection table:
Jan 12 18:24:43 behemoth kernel:  NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
Jan 12 18:24:43 behemoth kernel:  00 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  01 003 03  0    0    0   0   0    1    1    39
Jan 12 18:24:43 behemoth kernel:  02 003 03  0    0    0   0   0    1    1    31
Jan 12 18:24:43 behemoth kernel:  03 003 03  0    0    0   0   0    1    1    41
Jan 12 18:24:43 behemoth kernel:  04 003 03  0    0    0   0   0    1    1    49
Jan 12 18:24:43 behemoth kernel:  05 003 03  0    0    0   0   0    1    1    51
Jan 12 18:24:43 behemoth kernel:  06 003 03  0    0    0   0   0    1    1    59
Jan 12 18:24:43 behemoth kernel:  07 003 03  0    0    0   0   0    1    1    61
Jan 12 18:24:43 behemoth kernel:  08 003 03  0    0    0   0   0    1    1    69
Jan 12 18:24:43 behemoth kernel:  09 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  0a 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  0b 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  0c 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  0d 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  0e 003 03  0    0    0   0   0    1    1    71
Jan 12 18:24:43 behemoth kernel:  0f 003 03  0    0    0   0   0    1    1    79
Jan 12 18:24:43 behemoth kernel:  10 003 03  0    1    0   1   0    1    1    81
Jan 12 18:24:43 behemoth kernel:  11 003 03  0    1    0   1   0    1    1    89
Jan 12 18:24:43 behemoth kernel:  12 003 03  0    1    0   1   0    1    1    91
Jan 12 18:24:43 behemoth kernel:  13 003 03  0    1    0   1   0    1    1    99
Jan 12 18:24:43 behemoth kernel:  14 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  15 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  16 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel:  17 000 00  1    0    0   0   0    0    0    00
Jan 12 18:24:43 behemoth kernel: IRQ to pin mappings:
Jan 12 18:24:43 behemoth kernel: IRQ0 -> 2
Jan 12 18:24:43 behemoth kernel: IRQ1 -> 1
Jan 12 18:24:43 behemoth kernel: IRQ3 -> 3
Jan 12 18:24:43 behemoth kernel: IRQ4 -> 4
Jan 12 18:24:43 behemoth kernel: IRQ5 -> 5
Jan 12 18:24:43 behemoth kernel: IRQ6 -> 6
Jan 12 18:24:43 behemoth kernel: IRQ7 -> 7
Jan 12 18:24:43 behemoth kernel: IRQ8 -> 8
Jan 12 18:24:43 behemoth kernel: IRQ13 -> 13
Jan 12 18:24:43 behemoth kernel: IRQ14 -> 14
Jan 12 18:24:43 behemoth kernel: IRQ15 -> 15
Jan 12 18:24:43 behemoth kernel: IRQ16 -> 16
Jan 12 18:24:43 behemoth kernel: IRQ17 -> 17
Jan 12 18:24:43 behemoth kernel: IRQ18 -> 18
Jan 12 18:24:43 behemoth kernel: IRQ19 -> 19
Jan 12 18:24:43 behemoth kernel: .................................... done.
Jan 12 18:24:43 behemoth kernel: print_all_local_APICs()
Jan 12 18:24:43 behemoth kernel:
Jan 12 18:24:43 behemoth kernel: printing local APIC contents on CPU#1/1:
Jan 12 18:24:43 behemoth kernel: ... APIC ID:      01000000 (1)
Jan 12 18:24:43 behemoth kernel: ... APIC VERSION: 00040011
Jan 12 18:24:43 behemoth kernel: ... APIC TASKPRI: 00000000 (00)
Jan 12 18:24:43 behemoth kernel: ... APIC ARBPRI: 00000000 (00)
Jan 12 18:24:43 behemoth kernel: ... APIC PROCPRI: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC EOI: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC LDR: 02000000
Jan 12 18:24:43 behemoth kernel: ... APIC DFR: ffffffff
Jan 12 18:24:43 behemoth kernel: ... APIC SPIV: 000003ff
Jan 12 18:24:43 behemoth kernel: ... APIC ISR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 7 times
Jan 12 18:24:43 behemoth kernel: ... APIC TMR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 3 times
Jan 12 18:24:43 behemoth kernel: 00000000010000000000000001000000
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 2 times
Jan 12 18:24:43 behemoth kernel: ... APIC IRR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 7 times
Jan 12 18:24:43 behemoth kernel: ... APIC ESR: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC ICR: 000008fc
Jan 12 18:24:43 behemoth kernel: ... APIC ICR2: 01000000
Jan 12 18:24:43 behemoth kernel: ... APIC LVTT: 000200ef
Jan 12 18:24:43 behemoth kernel: ... APIC LVTPC: 00010000
Jan 12 18:24:43 behemoth kernel: ... APIC LVT0: 00010700
Jan 12 18:24:43 behemoth kernel: ... APIC LVT1: 00010400
Jan 12 18:24:43 behemoth kernel: ... APIC LVTERR: 000000fe
Jan 12 18:24:43 behemoth kernel: ... APIC TMICT: 0000a322
Jan 12 18:24:43 behemoth kernel: ... APIC TMCCT: 00000be6
Jan 12 18:24:43 behemoth kernel: ... APIC TDCR: 00000003
Jan 12 18:24:43 behemoth kernel:
Jan 12 18:24:43 behemoth kernel:
Jan 12 18:24:43 behemoth kernel: printing local APIC contents on CPU#0/0:
Jan 12 18:24:43 behemoth kernel: ... APIC ID:      00000000 (0)
Jan 12 18:24:43 behemoth kernel: ... APIC VERSION: 00040011
Jan 12 18:24:43 behemoth kernel: ... APIC TASKPRI: 00000000 (00)
Jan 12 18:24:43 behemoth kernel: ... APIC ARBPRI: 000000e0 (e0)
Jan 12 18:24:43 behemoth kernel: ... APIC PROCPRI: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC EOI: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC LDR: 01000000
Jan 12 18:24:43 behemoth kernel: ... APIC DFR: ffffffff
Jan 12 18:24:43 behemoth kernel: ... APIC SPIV: 000003ff
Jan 12 18:24:43 behemoth kernel: ... APIC ISR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 7 times
Jan 12 18:24:43 behemoth kernel: ... APIC TMR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 3 times
Jan 12 18:24:43 behemoth kernel: 00000000010000000000000001000000
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 2 times
Jan 12 18:24:43 behemoth kernel: ... APIC IRR field:
Jan 12 18:24:43 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth kernel: 00000000000000000100000000000000
Jan 12 18:24:43 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:24:43 behemoth last message repeated 4 times
Jan 12 18:24:43 behemoth kernel: 00000000000000010000000000000000
Jan 12 18:24:43 behemoth kernel: ... APIC ESR: 00000000
Jan 12 18:24:43 behemoth kernel: ... APIC ICR: 000c08fb
Jan 12 18:24:43 behemoth kernel: ... APIC ICR2: 02000000
Jan 12 18:24:43 behemoth kernel: ... APIC LVTT: 000200ef
Jan 12 18:24:43 behemoth kernel: ... APIC LVTPC: 00010000
Jan 12 18:24:43 behemoth kernel: ... APIC LVT0: 00010700
Jan 12 18:24:43 behemoth kernel: ... APIC LVT1: 00000400
Jan 12 18:24:43 behemoth kernel: ... APIC LVTERR: 000000fe
Jan 12 18:24:43 behemoth kernel: ... APIC TMICT: 0000a322
Jan 12 18:24:43 behemoth kernel: ... APIC TMCCT: 000041e1
Jan 12 18:24:43 behemoth kernel: ... APIC TDCR: 00000003


After network hang (nmi_watchdog=0)
===================================

Jan 12 18:26:21 behemoth kernel: SysRq:
Jan 12 18:26:21 behemoth kernel: print_PIC()
Jan 12 18:26:21 behemoth kernel:
Jan 12 18:26:21 behemoth kernel: printing PIC contents
Jan 12 18:26:21 behemoth kernel: ... PIC  IMR: fffa
Jan 12 18:26:21 behemoth kernel: ... PIC  IRR: 0000
Jan 12 18:26:21 behemoth kernel: ... PIC  ISR: 0000
Jan 12 18:26:21 behemoth kernel: ... PIC ELCR: 1e00
Jan 12 18:26:21 behemoth kernel: print_IO_APIC()
Jan 12 18:26:21 behemoth kernel: number of MP IRQ sources: 23.
Jan 12 18:26:21 behemoth kernel: number of IO-APIC #2 registers: 24.
Jan 12 18:26:21 behemoth kernel: testing the IO APIC.......................
Jan 12 18:26:21 behemoth kernel:
Jan 12 18:26:21 behemoth kernel: IO APIC #2......
Jan 12 18:26:21 behemoth kernel: .... register #00: 02000000
Jan 12 18:26:21 behemoth kernel: .......    : physical APIC id: 02
Jan 12 18:26:21 behemoth kernel: .... register #01: 00170011
Jan 12 18:26:21 behemoth kernel: .......     : max redirection entries: 0017
Jan 12 18:26:21 behemoth kernel: .......     : IO APIC version: 0011
Jan 12 18:26:21 behemoth kernel: .... register #02: 00000000
Jan 12 18:26:21 behemoth kernel: .......     : arbitration: 00
Jan 12 18:26:21 behemoth kernel: .... IRQ redirection table:
Jan 12 18:26:21 behemoth kernel:  NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
Jan 12 18:26:21 behemoth kernel:  00 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  01 003 03  0    0    0   0   0    1    1    39
Jan 12 18:26:21 behemoth kernel:  02 003 03  0    0    0   0   0    1    1    31
Jan 12 18:26:21 behemoth kernel:  03 003 03  0    0    0   0   0    1    1    41
Jan 12 18:26:21 behemoth kernel:  04 003 03  0    0    0   0   0    1    1    49
Jan 12 18:26:21 behemoth kernel:  05 003 03  0    0    0   0   0    1    1    51
Jan 12 18:26:21 behemoth kernel:  06 003 03  0    0    0   0   0    1    1    59
Jan 12 18:26:21 behemoth kernel:  07 003 03  0    0    0   0   0    1    1    61
Jan 12 18:26:21 behemoth kernel:  08 003 03  0    0    0   0   0    1    1    69
Jan 12 18:26:21 behemoth kernel:  09 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  0a 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  0b 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  0c 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  0d 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  0e 003 03  0    0    0   0   0    1    1    71
Jan 12 18:26:21 behemoth kernel:  0f 003 03  0    0    0   0   0    1    1    79
Jan 12 18:26:21 behemoth kernel:  10 003 03  0    1    0   1   0    1    1    81
Jan 12 18:26:21 behemoth kernel:  11 003 03  0    1    0   1   0    1    1    89
Jan 12 18:26:21 behemoth kernel:  12 003 03  0    1    0   1   0    1    1    91
Jan 12 18:26:21 behemoth kernel:  13 003 03  0    1    1   1   0    1    1    99
Jan 12 18:26:21 behemoth kernel:  14 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  15 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  16 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel:  17 000 00  1    0    0   0   0    0    0    00
Jan 12 18:26:21 behemoth kernel: IRQ to pin mappings:
Jan 12 18:26:21 behemoth kernel: IRQ0 -> 2
Jan 12 18:26:21 behemoth kernel: IRQ1 -> 1
Jan 12 18:26:21 behemoth kernel: IRQ3 -> 3
Jan 12 18:26:21 behemoth kernel: IRQ4 -> 4
Jan 12 18:26:21 behemoth kernel: IRQ5 -> 5
Jan 12 18:26:21 behemoth kernel: IRQ6 -> 6
Jan 12 18:26:21 behemoth kernel: IRQ7 -> 7
Jan 12 18:26:21 behemoth kernel: IRQ8 -> 8
Jan 12 18:26:21 behemoth kernel: IRQ13 -> 13
Jan 12 18:26:21 behemoth kernel: IRQ14 -> 14
Jan 12 18:26:21 behemoth kernel: IRQ15 -> 15
Jan 12 18:26:21 behemoth kernel: IRQ16 -> 16
Jan 12 18:26:21 behemoth kernel: IRQ17 -> 17
Jan 12 18:26:21 behemoth kernel: IRQ18 -> 18
Jan 12 18:26:21 behemoth kernel: IRQ19 -> 19
Jan 12 18:26:21 behemoth kernel: .................................... done.
Jan 12 18:26:21 behemoth kernel: print_all_local_APICs()
Jan 12 18:26:21 behemoth kernel:
Jan 12 18:26:21 behemoth kernel: printing local APIC contents on CPU#1/1:
Jan 12 18:26:21 behemoth kernel: ... APIC ID:      01000000 (1)
Jan 12 18:26:21 behemoth kernel: ... APIC VERSION: 00040011
Jan 12 18:26:21 behemoth kernel: ... APIC TASKPRI: 00000000 (00)
Jan 12 18:26:21 behemoth kernel: ... APIC ARBPRI: 00000000 (00)
Jan 12 18:26:21 behemoth kernel: ... APIC PROCPRI: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC EOI: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC LDR: 02000000
Jan 12 18:26:21 behemoth kernel: ... APIC DFR: ffffffff
Jan 12 18:26:21 behemoth kernel: ... APIC SPIV: 000003ff
Jan 12 18:26:21 behemoth kernel: ... APIC ISR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 7 times
Jan 12 18:26:21 behemoth kernel: ... APIC TMR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 3 times
Jan 12 18:26:21 behemoth kernel: 00000000010000000000000000000000
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 2 times
Jan 12 18:26:21 behemoth kernel: ... APIC IRR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 7 times
Jan 12 18:26:21 behemoth kernel: ... APIC ESR: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC ICR: 000008fc
Jan 12 18:26:21 behemoth kernel: ... APIC ICR2: 01000000
Jan 12 18:26:21 behemoth kernel: ... APIC LVTT: 000200ef
Jan 12 18:26:21 behemoth kernel: ... APIC LVTPC: 00010000
Jan 12 18:26:21 behemoth kernel: ... APIC LVT0: 00010700
Jan 12 18:26:21 behemoth kernel: ... APIC LVT1: 00010400
Jan 12 18:26:21 behemoth kernel: ... APIC LVTERR: 000000fe
Jan 12 18:26:21 behemoth kernel: ... APIC TMICT: 0000a322
Jan 12 18:26:21 behemoth kernel: ... APIC TMCCT: 00001803
Jan 12 18:26:21 behemoth kernel: ... APIC TDCR: 00000003
Jan 12 18:26:21 behemoth kernel:
Jan 12 18:26:21 behemoth kernel:
Jan 12 18:26:21 behemoth kernel: printing local APIC contents on CPU#0/0:
Jan 12 18:26:21 behemoth kernel: ... APIC ID:      00000000 (0)
Jan 12 18:26:21 behemoth kernel: ... APIC VERSION: 00040011
Jan 12 18:26:21 behemoth kernel: ... APIC TASKPRI: 00000000 (00)
Jan 12 18:26:21 behemoth kernel: ... APIC ARBPRI: 000000e0 (e0)
Jan 12 18:26:21 behemoth kernel: ... APIC PROCPRI: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC EOI: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC LDR: 01000000
Jan 12 18:26:21 behemoth kernel: ... APIC DFR: ffffffff
Jan 12 18:26:21 behemoth kernel: ... APIC SPIV: 000003ff
Jan 12 18:26:21 behemoth kernel: ... APIC ISR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 7 times
Jan 12 18:26:21 behemoth kernel: ... APIC TMR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 3 times
Jan 12 18:26:21 behemoth kernel: 00000000010000000000000001000000
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 2 times
Jan 12 18:26:21 behemoth kernel: ... APIC IRR field:
Jan 12 18:26:21 behemoth kernel: 0123456789abcdef0123456789abcdef
Jan 12 18:26:21 behemoth kernel: 00000000000000000000000000000000
Jan 12 18:26:21 behemoth last message repeated 6 times
Jan 12 18:26:21 behemoth kernel: 00000000000000010000000000000000
Jan 12 18:26:21 behemoth kernel: ... APIC ESR: 00000000
Jan 12 18:26:21 behemoth kernel: ... APIC ICR: 000c08fb
Jan 12 18:26:21 behemoth kernel: ... APIC ICR2: 02000000
Jan 12 18:26:21 behemoth kernel: ... APIC LVTT: 000200ef
Jan 12 18:26:21 behemoth kernel: ... APIC LVTPC: 00010000
Jan 12 18:26:21 behemoth kernel: ... APIC LVT0: 00010700
Jan 12 18:26:21 behemoth kernel: ... APIC LVT1: 00000400
Jan 12 18:26:21 behemoth kernel: ... APIC LVTERR: 000000fe
Jan 12 18:26:21 behemoth kernel: ... APIC TMICT: 0000a322
Jan 12 18:26:21 behemoth kernel: ... APIC TMCCT: 00004e26
Jan 12 18:26:21 behemoth kernel: ... APIC TDCR: 00000003

-- 
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 }#   \|   /                          \
  ##---# _/     <Hacker for Hire>      \
   ####   \      +31-320-252965        /
           \    frank@unternet.org    /
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

[-- Attachment #1: Type: text/plain, Size: 499 bytes --]

Frank de Lange wrote:
> 
> On Fri, Jan 12, 2001 at 06:16:36PM +0100, Manfred Spraul wrote:
> > I would first concentrate on the differences between 2.2 and 2.4:
> >
> > Frank, could you try what happens with the NMI oopser disabled?
> 
> Here's the results with nmi_watchdog=0
> 
> 
> After network hang (nmi_watchdog=0)
> ===================================
> 

It still hangs.

Frank, I've attached a proposed kick_IOAPIC pin. Could you try it?
I'm rebooting with that patch right now.
--
	Manfred

[-- Attachment #2: patch-frank --]
[-- Type: text/plain, Size: 1629 bytes --]

1) add to the end of io_apic.c:

static void print_line(struct IO_APIC_route_entry* entry)
{
	printk(KERN_EMERG " %02x %03X %02X  ",
			0,
			entry->dest.logical.logical_dest,
			entry->dest.physical.physical_dest
		);

	printk("%1d    %1d    %1d   %1d   %1d    %1d    %1d    %02X\n",
			entry->mask,
			entry->trigger,
			entry->irr,
			entry->polarity,
			entry->delivery_status,
			entry->dest_mode,
			entry->delivery_mode,
			entry->vector
		);
}

void kick_IOAPIC_pin(int pin)
{
    	unsigned long flags;
	struct IO_APIC_route_entry entry;

	local_irq_save(flags);

	*(((int *)&entry) + 1) = io_apic_read(0, 0x11 + 2 * pin);
	*(((int *)&entry) + 0) = io_apic_read(0, 0x10 + 2 * pin);

	printk(KERN_EMERG " NR Log Phy Mask Trig IRR Pol"
			  " Stat Dest Deli Vect:   \n");
	printk(KERN_EMERG "Before:\n");
	print_line(&entry);

	entry.trigger = 0;
	io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry) + 1));
	io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry) + 0));
	udelay(10);
	printk(KERN_EMERG "After switching to edge:\n");
	print_line(&entry);

	entry.trigger = 1;
	io_apic_write(0, 0x11 + 2 * pin, *(((int *)&entry) + 1));
	io_apic_write(0, 0x10 + 2 * pin, *(((int *)&entry) + 0));
	udelay(10);
	printk(KERN_EMERG "After switch back:\n");
	print_line(&entry);

	local_irq_restore(flags);
}

2) add to sysrq.c:
--- 2.4/drivers/char/sysrq.c	Mon Dec  4 02:48:19 2000
+++ build-2.4/drivers/char/sysrq.c	Fri Jan 12 18:37:57 2001
@@ -137,6 +137,9 @@
 		send_sig_all(SIGKILL, 1);
 		orig_log_level = 8;
 		break;
+	case 'q':
+		kick_IOAPIC_pin(19);
+
 	default:					    /* Unknown: help */
 		if (kbd)
 			printk("unRaw ");

Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 06:51:36PM +0100, Manfred Spraul wrote:
> Frank, I've attached a proposed kick_IOAPIC pin. Could you try it?
> I'm rebooting with that patch right now.

I added the patch, and tried it out. When the network hangs, I am able to revive it with ALT-SYSRQ-Q. The debug log shows these entries:

Jan 12 19:22:57 behemoth kernel: SysRq: <0> NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
Jan 12 19:22:57 behemoth kernel: Before:
Jan 12 19:22:57 behemoth kernel:  00 003 03  0    1    1   1   1    1    1    99
Jan 12 19:22:57 behemoth kernel: After switching to edge:
Jan 12 19:22:57 behemoth kernel:  00 003 03  0    0    1   1   1    1    1    99
Jan 12 19:22:57 behemoth kernel: After switch back:
Jan 12 19:22:57 behemoth kernel:  00 003 03  0    1    1   1   1    1    1    99

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

[-- Attachment #1: Type: text/plain, Size: 371 bytes --]

Linus wrote:
> Does this seem to happen mainly with drivers that use "disable_irq()" 
> and "enable_irq()"? I know the ne drivers do (through the 8390 module), 
> and some others do too (3c59x). 

I removed the disable_irq lines from 8390.c, and that fixed the problem:
no hang within 2 minutes - the test is still running.

Frank, could you double check it?

--
	Manfred

[-- Attachment #2: patch-frank --]
[-- Type: text/plain, Size: 1620 bytes --]

// $Header$
// Kernel Version:
//  VERSION = 2
//  PATCHLEVEL = 4
//  SUBLEVEL = 0
//  EXTRAVERSION =
--- 2.4/drivers/net/8390.c	Thu Jan  4 22:00:55 2001
+++ build-2.4/drivers/net/8390.c	Fri Jan 12 19:53:47 2001
@@ -242,15 +242,15 @@
 
 	/* Ugly but a reset can be slow, yet must be protected */
 		
-	disable_irq_nosync(dev->irq);
-	spin_lock(&ei_local->page_lock);
+/*	disable_irq_nosync(dev->irq);*/
+	spin_lock_irqsave(&ei_local->page_lock, flags);
 		
 	/* Try to restart the card.  Perhaps the user has fixed something. */
 	ei_reset_8390(dev);
 	NS8390_init(dev, 1);
 		
-	spin_unlock(&ei_local->page_lock);
-	enable_irq(dev->irq);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+/*	enable_irq(dev->irq); */
 	netif_wake_queue(dev);
 }
     
@@ -285,9 +285,9 @@
 	 *	Slow phase with lock held.
 	 */
 	 
-	disable_irq_nosync(dev->irq);
+/*	disable_irq_nosync(dev->irq);*/
 	
-	spin_lock(&ei_local->page_lock);
+	spin_lock_irqsave(&ei_local->page_lock, flags);
 	
 	ei_local->irqlock = 1;
 
@@ -327,8 +327,8 @@
 		ei_local->irqlock = 0;
 		netif_stop_queue(dev);
 		outb_p(ENISR_ALL, e8390_base + EN0_IMR);
-		spin_unlock(&ei_local->page_lock);
-		enable_irq(dev->irq);
+		spin_unlock_irqrestore(&ei_local->page_lock, flags);
+/*		enable_irq(dev->irq);*/
 		ei_local->stat.tx_errors++;
 		return 1;
 	}
@@ -383,8 +383,8 @@
 	ei_local->irqlock = 0;
 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
 	
-	spin_unlock(&ei_local->page_lock);
-	enable_irq(dev->irq);
+	spin_unlock_irqrestore(&ei_local->page_lock, flags);
+/*	enable_irq(dev->irq); */
 
 	dev_kfree_skb (skb);
 	ei_local->stat.tx_bytes += send_length;

Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 08:04:24PM +0100, Manfred Spraul wrote:
> Linus wrote:
> > Does this seem to happen mainly with drivers that use "disable_irq()" 
> > and "enable_irq()"? I know the ne drivers do (through the 8390 module), 
> > and some others do too (3c59x). 
> 
> I removed the disable_irq lines from 8390.c, and that fixed the problem:
> no hang within 2 minutes - the test is still running.
> 
> Frank, could you double check it?

Hm, I also sent in a (somewhat different) patch on my own... :-)]

Anyway, still running under heavy load...

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 08:04:24PM +0100, Manfred Spraul wrote:
> I removed the disable_irq lines from 8390.c, and that fixed the problem:
> no hang within 2 minutes - the test is still running.
> 
> Frank, could you double check it?

I'm currently running my own patched version, which uses
spin_lock_irq/spin_unlock_irq instead of
spin_lock_irqsave/spin_unlock_irqrestore like you patch uses. Looking at
spinlock.h, spin_lock_irq does a local irq disable, which seems to be closer to
the original intent (disable_irq) than spin_lock_irqsave. Anyone want to
comment on this?

Anyway, still running under load, also got USB (which uses the same irq) to
produce some interrupts by scanning some stuff. No problems so far...

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

Frank de Lange wrote:
> 
> On Fri, Jan 12, 2001 at 08:04:24PM +0100, Manfred Spraul wrote:
> > I removed the disable_irq lines from 8390.c, and that fixed the problem:
> > no hang within 2 minutes - the test is still running.
> >
> > Frank, could you double check it?
> 
> I'm currently running my own patched version, which uses
> spin_lock_irq/spin_unlock_irq instead of
> spin_lock_irqsave/spin_unlock_irqrestore like you patch uses. Looking at
> spinlock.h, spin_lock_irq does a local irq disable, which seems to be closer to
> the original intent (disable_irq) than spin_lock_irqsave. Anyone want to
> comment on this?
> 
It's a bit dangerous: _if_ one of the function is called with disabled
local interrupts, then spin_unlock_irq would enable these interrupts.
That could cause other problems, but I haven't checked if these function
are actually called with disabled interrupts - e.g. the transmit
function is called with enabled interrupts.

Frank, the 2.4.0 contains 2 band aids that were added for ne2k smp:

* From Ingo: focus cpu disabled, in arch/i386/kernel/apic.c
* From myself: TARGET_CPU = cpu_online_mask, was 0xFF.

Could you disable both bandaids? I disabled them, no problems so far.

Now back to the disable_irq_nosync().
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 08:33:15PM +0100, Manfred Spraul wrote:
> Frank, the 2.4.0 contains 2 band aids that were added for ne2k smp:
> 
> * From Ingo: focus cpu disabled, in arch/i386/kernel/apic.c
> * From myself: TARGET_CPU = cpu_online_mask, was 0xFF.
> 
> Could you disable both bandaids? I disabled them, no problems so far.

I disabled both (I guess you meant the 'define TARGET_CPUS cpu_online' in
io_apic.c?), and reverted my own patch, added your patch... Now running with
the usual heavy network load, no problems so far... Also made USB produce
interrupts (shares irq with network), no problems...

Could this really be the solution?

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Linus Torvalds]

On Fri, 12 Jan 2001, Frank de Lange wrote:

> On Fri, Jan 12, 2001 at 08:33:15PM +0100, Manfred Spraul wrote:
> > Frank, the 2.4.0 contains 2 band aids that were added for ne2k smp:
> > 
> > * From Ingo: focus cpu disabled, in arch/i386/kernel/apic.c
> > * From myself: TARGET_CPU = cpu_online_mask, was 0xFF.
> > 
> > Could you disable both bandaids? I disabled them, no problems so far.
> 
> I disabled both (I guess you meant the 'define TARGET_CPUS cpu_online' in
> io_apic.c?), and reverted my own patch, added your patch... Now running with
> the usual heavy network load, no problems so far... Also made USB produce
> interrupts (shares irq with network), no problems...
> 
> Could this really be the solution?

I'd like to know _which_ of the two makes a difference (or does it only
trigger with both of them enabled)? And even then I'm not sure that it is
"the" solution - both changes to io-apic handling had some reason for
them. Ingo, what was the focus-cpu thing?

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Ingo Molnar]

On Fri, 12 Jan 2001, Linus Torvalds wrote:

> [...] Ingo, what was the focus-cpu thing?

well, some time ago i had an ne2k card in an SMP system as well, and found
this very problem. Disabling/enabling focus-cpu appeared to make a
difference, but later on i made experiments that show that in both cases
the hang happens. I spent a good deal of time trying to fix this problem,
but failed - so any fresh ideas are more than welcome.

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Roeland Th. Jansen]

On Fri, Jan 12, 2001 at 09:03:49PM +0100, Ingo Molnar wrote:
> well, some time ago i had an ne2k card in an SMP system as well, and found
> this very problem. Disabling/enabling focus-cpu appeared to make a
> difference, but later on i made experiments that show that in both cases
> the hang happens. I spent a good deal of time trying to fix this problem,
> but failed - so any fresh ideas are more than welcome.

for the record. my BP6, non OC, apic smp system with ne2k fails within
24 hours here too. if I can be of any help..... (2.4.0. kernel. no
vmware or opensound)

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Sun, Jan 14, 2001 at 12:13:58AM +0000, Roeland Th. Jansen wrote:
> On Fri, Jan 12, 2001 at 09:03:49PM +0100, Ingo Molnar wrote:
> > well, some time ago i had an ne2k card in an SMP system as well, and found
> > this very problem. Disabling/enabling focus-cpu appeared to make a
> > difference, but later on i made experiments that show that in both cases
> > the hang happens. I spent a good deal of time trying to fix this problem,
> > but failed - so any fresh ideas are more than welcome.
> 
> for the record. my BP6, non OC, apic smp system with ne2k fails within
> 24 hours here too. if I can be of any help..... (2.4.0. kernel. no
> vmware or opensound)

You can help yourself by applying Manfred's patch to 8390.c (in preference to
my own patch to the same file). This will sove the hanging-network problem. If
your entire box hangs, that's another story which will probably not be fixed by
that patch. You can find the patch in Manfred's posting to the list from Fri
Jan 12 2001 - 14:04:24 EST.

I've been running a patched driver for more than a day now, under heavy network
load, without problems.

Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 11:59:25AM -0800, Linus Torvalds wrote:
> > Could this really be the solution?
> 
> I'd like to know _which_ of the two makes a difference (or does it only
> trigger with both of them enabled)? And even then I'm not sure that it is
> "the" solution - both changes to io-apic handling had some reason for
> them. Ingo, what was the focus-cpu thing?

Well, with 'this' (in 'could THIS be') I really meant the move from disable_irq
to the irq_safe spinlocks. I'm currently running with the patched 8390.c
driver, patched io_apic (TARGET_CPUS 0xff) and patched apic.c (focus cpu
enabled), and have had no problems yet... even though I'm running several
simulatnsous nfs cp -rd <big_dir>, streaming network audio, scanning with an
USB scanner, etc.

So far, it seems that the patch to 8390.c removed the symptoms. The changes to
apic.c and io_apic.c did not make the network hang come back. 

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Manfred Spraul]

Linus Torvalds wrote:
> 
> 
> I'd like to know _which_ of the two makes a difference (or does it only
> trigger with both of them enabled)? And even then I'm not sure that it is
> "the" solution - both changes to io-apic handling had some reason for
> them. Ingo, what was the focus-cpu thing?
> 

Frank, please clarify:
you still run without disable_irq_nosync() in 8390.c?

I have a first idea: we send an EOI to an interrupt that is masked on
the IO apic, perhaps that causes the problems.

I'm right now typing a patch.

--
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:11:29PM +0100, Manfred Spraul wrote:
> Frank, please clarify:
> you still run without disable_irq_nosync() in 8390.c?

I am running with your patched version of 8390.c (so WITHOUT
disable_irq_nosync()).

In addition, I patched apic.c (focus cpu enabled)
In addition, I patched io_apic ((TARGET_CPUS 0xff)

> I have a first idea: we send an EOI to an interrupt that is masked on
> the IO apic, perhaps that causes the problems.

Sound plausible...

> I'm right now typing a patch.

I'll await yours instead of making my own patch this time... :-)

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Ingo Molnar]

On Fri, 12 Jan 2001, Frank de Lange wrote:

> In addition, I patched apic.c (focus cpu enabled)
> In addition, I patched io_apic ((TARGET_CPUS 0xff)

please try it with the focus CPU enabling change (we want to enable that
feature, i only disabled it due to the stuck-ne2k bug), but with
TARGET_CPUS set to cpu_online_mask. (this later is needed for certain
crappy BIOSes.)

i believe the ne2k driver change is the key.

> > I have a first idea: we send an EOI to an interrupt that is masked on
> > the IO apic, perhaps that causes the problems.
>
> Sound plausible...

does not help. I've tried it (and many other combinations). I did not find
any direct workaround for this problem. (i tried very hard.)

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:19:53PM +0100, Ingo Molnar wrote:
> > In addition, I patched apic.c (focus cpu enabled)
> > In addition, I patched io_apic ((TARGET_CPUS 0xff)
> 
> please try it with the focus CPU enabling change (we want to enable that
> feature, i only disabled it due to the stuck-ne2k bug), but with
> TARGET_CPUS set to cpu_online_mask. (this later is needed for certain
> crappy BIOSes.)

WITH or WITHOUT the changed 8390 driver? I can already give you the results for
running WITH the changed driver: it works. I have not yet tried it WITHOUT the
changed 8390 driver (so that would be stock 8390, patched apic.c, stock
io_apic.c). Please let me know which you want...

Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Ingo Molnar]

On Fri, 12 Jan 2001, Frank de Lange wrote:

> WITH or WITHOUT the changed 8390 driver? I can already give you the
> results for running WITH the changed driver: it works. I have not yet
> tried it WITHOUT the changed 8390 driver (so that would be stock 8390,
> patched apic.c, stock io_apic.c). Please let me know which you want...

WITH. patched 8390.c, patched apic.c, sock io_apic.c. My very strong
feeling is that this will be a stable combination, and that this is what
we want as a final solution.

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:31:15PM +0100, Ingo Molnar wrote:
> 
> On Fri, 12 Jan 2001, Frank de Lange wrote:
> 
> > WITH or WITHOUT the changed 8390 driver? I can already give you the
> > results for running WITH the changed driver: it works. I have not yet
> > tried it WITHOUT the changed 8390 driver (so that would be stock 8390,
> > patched apic.c, stock io_apic.c). Please let me know which you want...
> 
> WITH. patched 8390.c, patched apic.c, sock io_apic.c. My very strong
> feeling is that this will be a stable combination, and that this is what
> we want as a final solution.

It is. As I already mentioned in other messages, I already tested with JUST the
patched 8390.c driver, no other patches. It was stable. I then patched apic.c
AND io_apic.c, which did not introduce new instabilities. Unless you think that
reverting back to a stock io_apic.c would cause instabilities (which would be
weird, since I had no instabilities running only a patched 8390.c), I think the
patch to 8390.c DOES remove the symptoms all by itself. No other patches seem
necessary to get a stable box.

But I'll patch the mess again just fox kicks :-)

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Ingo Molnar]

On Fri, 12 Jan 2001, Frank de Lange wrote:

> It is. As I already mentioned in other messages, I already tested with
> JUST the patched 8390.c driver, no other patches. It was stable. I
> then patched apic.c AND io_apic.c, which did not introduce new
> instabilities. Unless you think that reverting back to a stock
> io_apic.c would cause instabilities (which would be weird, since I had
> no instabilities running only a patched 8390.c), I think the patch to
> 8390.c DOES remove the symptoms all by itself. No other patches seem
> necessary to get a stable box.

okay - i just wanted to hear a definitive word from you that this fixes
your problem, because this is what we'll have to do as a final solution.
(barring any other solution.)

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[David Woodhouse]

On Fri, 12 Jan 2001, Ingo Molnar wrote:

> okay - i just wanted to hear a definitive word from you that this fixes
> your problem, because this is what we'll have to do as a final solution.
> (barring any other solution.)

Patching 8390.c won't fix this for me. The only thing on IRQ19 when I saw
interrupts die was usb-uhci, and that doesn't appear to use disable_irq.

But then again, I've only ever seen this happen once. It's not repeatable.

-- 
dwmw2


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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:37:24PM +0100, Ingo Molnar wrote:
> okay - i just wanted to hear a definitive word from you that this fixes
> your problem, because this is what we'll have to do as a final solution.
> (barring any other solution.)

Now running with this config:

PATCHED 8390.c (using irq_safe spinlocks instead of disable_irq)
PATCHED apic.c (focus cpu ENABLED)
STOCK io_apic.c

No problems under heavy network load.

Gentleman, this (the patch to 8390.c) seems to fix the problem.

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Ingo Molnar]

On Fri, 12 Jan 2001, Frank de Lange wrote:

> PATCHED 8390.c (using irq_safe spinlocks instead of disable_irq)
> PATCHED apic.c (focus cpu ENABLED)
> STOCK io_apic.c
>
> No problems under heavy network load.
>
> Gentleman, this (the patch to 8390.c) seems to fix the problem.

great. Back when i had the same problem, flood pinging another host (on
the local network) was the quickest way to reproduce the hang:

	ping -f -s 10 otherhost

this produced an IOAPIC-hang within seconds.

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:51:36PM +0100, Ingo Molnar wrote:
> great. Back when i had the same problem, flood pinging another host (on
> the local network) was the quickest way to reproduce the hang:
> 
> 	ping -f -s 10 otherhost
> 
> this produced an IOAPIC-hang within seconds.

Apart from killing streaming audio and interactive network use, nothing hangs.
As soon as the ping flood is stopped, audio streams on and ssh sessions are
useable again. So, it seems to fix it...

Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Jorge Nerin]

Frank de Lange wrote:
> 
> On Fri, Jan 12, 2001 at 09:51:36PM +0100, Ingo Molnar wrote:
> > great. Back when i had the same problem, flood pinging another host (on
> > the local network) was the quickest way to reproduce the hang:
> >
> >       ping -f -s 10 otherhost
> >
> > this produced an IOAPIC-hang within seconds.
> 
> Apart from killing streaming audio and interactive network use, nothing hangs.
> As soon as the ping flood is stopped, audio streams on and ssh sessions are
> useable again. So, it seems to fix it...
> 
> Frank

I do have a 3c503 and a ne2k-pci both of them use the 8390, I can hang
the ne2k-pci easily by doing a ping -f, bigger packet size => early the
hang. But I cannot hang the 3c503 by doing this.

Now with 2.4.0 the ne2k-pci behaviour is that: doing a ping -f works for
some amount of time, then stops for a BIG amount of time (various
minutes), and then it works again (it seems), but at a much slower
speed, and if you test it with normal ping (ping host) you don't get
replies.

The packets really go down to the wire and I even got replies. but I
don't receive it.

Previous versions of 2.4.0-testX caused ne2k-pci to hang and remain
hanged until reboot.

System: Mb Gigabyte 586dx, 2x200MMX, 96Mb RAM,

-- 
Jorge Nerin
<comandante@zaralinux.com>
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Linus Torvalds]

On Fri, 12 Jan 2001, Frank de Lange wrote:
> 
> Gentleman, this (the patch to 8390.c) seems to fix the problem.

The problem with this patch is that anybody with a slow ISA ne2000 clone
will basically have absolutely _horrible_ interrupt latency because we
hold the irq lock over some quite expensive operations.

The spin_lock_irqsave() is absolutely my preferred fix, and if I remember
correctly this is in fact how some early 2.1.x code fixed the ne2000
driver when the original irq scalability stuff happened (for some time
during development we did not have a working "disable_irq()" AT ALL
because the irq-disabling counters etc logic hadn't been done).

The spinlock was changed to "disable_irq()" by a patch from Alan, if I
remember correctly, exactly because people couldn't access serial lines at
any kind of high speeds otherwise - even on "reasonable" hardware.

Alan may remember details better. The fact is that as a general design
principle we should _not_ be using "disable_irq/enable_irq" anyway. BUT
that there are some real-world concerns that make the "better" spinlock
handling have some problems too.

So yes, I bet the spinlock fixes it. But..

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 04:15:37PM -0800, Linus Torvalds wrote:
> On Fri, 12 Jan 2001, Frank de Lange wrote:
> > 
> > Gentleman, this (the patch to 8390.c) seems to fix the problem.
> 
> The problem with this patch is that anybody with a slow ISA ne2000 clone
> will basically have absolutely _horrible_ interrupt latency because we
> hold the irq lock over some quite expensive operations.
> 
> The spin_lock_irqsave() is absolutely my preferred fix, and if I remember
> correctly this is in fact how some early 2.1.x code fixed the ne2000
> driver when the original irq scalability stuff happened (for some time
> during development we did not have a working "disable_irq()" AT ALL
> because the irq-disabling counters etc logic hadn't been done).

And that's the patch I meant... Manfred's
spin_lock_irqsave/spin_unlock_irqrestore based one, not my
(spin_lock_irq/spin_unlock_irq) based patch. That is also the one I'm running
now.

Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Alan Cox]

> > The spin_lock_irqsave() is absolutely my preferred fix, and if I remember
> > correctly this is in fact how some early 2.1.x code fixed the ne2000
> > driver when the original irq scalability stuff happened (for some time
> > during development we did not have a working "disable_irq()" AT ALL
> > because the irq-disabling counters etc logic hadn't been done).
> 
> And that's the patch I meant... Manfred's
> spin_lock_irqsave/spin_unlock_irqrestore based one, not my
> (spin_lock_irq/spin_unlock_irq) based patch. That is also the one I'm running
> now.

The old code did it with #ifdef __SMP__ tests so it only screwed up SMP boxes,
which at the time was quite acceptable because real people didnt have them
and certainly at the price didnt put ne2000's in them 8)

The basic problem is that you cannot allow

	-	set multicast list
	-	open/close
	-	irq
	-	transmit

to occur except when serialized because of the indirection and register
gunge on the chip. The copies are slow and long enough that they prevent
28.8 modem sessions being usable.

I'd have to check the chip manual to be sure you even disable the irqs
without corrupting an in progress transfer

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Manfred Spraul]

[-- Attachment #1: Type: text/plain, Size: 887 bytes --]

Ingo Molnar wrote:
> 
> 
> okay - i just wanted to hear a definitive word from you that this fixes
> your problem, because this is what we'll have to do as a final solution.
> (barring any other solution.)
> 
Ingo, is that possible?

The current fix is "disable_irq_nosync() and enable_irq() cause
deadlocks with level triggered ioapic irqs, do not use them" - I'm sure
ne2k-pci isn't the only driver that uses these function.

I have found one combination that doesn't hang with the unpatched
8390.c, but network throughput is down to 1/2. I hope that's due to the
debugging changes.

I'll restart now from a fresh 2.4.0 tree:
Changes:

1) enable focus cpu.
2) apply the attached patch.

I'm not sure if it's a real fix or if it just hides the problem: my
sysrq patch has shown that clearing and setting the "level trigger" bit
in the io apic reanimates the IO APIC.

--
        Manfred

[-- Attachment #2: patch-io --]
[-- Type: text/plain, Size: 1698 bytes --]

--- build-2.4/arch/i386/kernel/io_apic.c.orig	Fri Jan 12 20:17:36 2001
+++ build-2.4/arch/i386/kernel/io_apic.c	Fri Jan 12 21:26:31 2001
@@ -134,6 +134,30 @@
 	spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
+DO_ACTION( __trigger_level,    0, |= 0x00008000, io_apic_sync(entry->apic))/* mask = 1 */
+DO_ACTION( __trigger_edge,  0, &= 0xffff7fff, )				/* mask = 0 */
+
+
+static void unmask_level_IO_APIC_irq (unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ioapic_lock, flags);
+	__trigger_level_IO_APIC_irq(irq);
+	__unmask_IO_APIC_irq(irq);
+	spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
+static void mask_level_IO_APIC_irq (unsigned int irq)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ioapic_lock, flags);
+	__mask_IO_APIC_irq(irq);
+	__trigger_edge_IO_APIC_irq(irq);
+	spin_unlock_irqrestore(&ioapic_lock, flags);
+}
+
 static void unmask_IO_APIC_irq (unsigned int irq)
 {
 	unsigned long flags;
@@ -143,6 +167,7 @@
 	spin_unlock_irqrestore(&ioapic_lock, flags);
 }
 
+
 void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
 {
 	struct IO_APIC_route_entry entry;
@@ -1181,14 +1206,14 @@
  */
 static unsigned int startup_level_ioapic_irq (unsigned int irq)
 {
-	unmask_IO_APIC_irq(irq);
+	unmask_level_IO_APIC_irq(irq);
 
 	return 0; /* don't check for pending */
 }
 
-#define shutdown_level_ioapic_irq	mask_IO_APIC_irq
-#define enable_level_ioapic_irq		unmask_IO_APIC_irq
-#define disable_level_ioapic_irq	mask_IO_APIC_irq
+#define shutdown_level_ioapic_irq	mask_level_IO_APIC_irq
+#define enable_level_ioapic_irq		unmask_level_IO_APIC_irq
+#define disable_level_ioapic_irq	mask_level_IO_APIC_irq
 
 static void end_level_ioapic_irq (unsigned int i)
 {

Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Frank de Lange]

On Fri, Jan 12, 2001 at 09:54:31PM +0100, Manfred Spraul wrote:
> I have found one combination that doesn't hang with the unpatched
> 8390.c, but network throughput is down to 1/2. I hope that's due to the
> debugging changes.

Hm, could it be that the fact that network throughput is halved causes the
problem not to appear? Remember, it only appears under HEAVY network load. A
single nfs cp -rd <big_dir> was not enough to hang my network, I needed to add
at least another cp -rd or some streaming audio or something else...

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Manfred Spraul]

Frank de Lange wrote:
> 
> On Fri, Jan 12, 2001 at 09:54:31PM +0100, Manfred Spraul wrote:
> > I have found one combination that doesn't hang with the unpatched
> > 8390.c, but network throughput is down to 1/2. I hope that's due to the
> > debugging changes.
> 
> Hm, could it be that the fact that network throughput is halved causes the
> problem not to appear?

No. The problem is still there. But now lots of losts packets instead of
a total hang.

Due to the modification of mask_irq now disable_irq_nosync and
enable_irq act as if I would press SysRQ+q every millisecond, and thus
the io apic is immediatly reset when it got stuck.

Btw, my initial assumption about EOI to masked interrupt must be wrong:
2.2 always first masks the irq, then it sends the EOI, and 2.2 doesn't
hang.

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardwarerelated?

[Alan Cox]

> WITH. patched 8390.c, patched apic.c, sock io_apic.c. My very strong
> feeling is that this will be a stable combination, and that this is what
> we want as a final solution.

If you do that please #ifdef SMP all the changes. Its impossible to use a modem
and an ne2K together on a typical PC otherwise. The copy from the NE2K with
irq disabled is just _SO_ slow you drop bytes continually.

I did all the horrible magic in the ne2k driver for a reason. The other 
alternative is to provide a way to force the system back out of apic mode
so the ne2K driver can do a

	goodbye_apic_crap()

type call

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

> Remind me: what polarity are your io-apic irq's? Level, edge, sideways?
> Anything else that might be relevant?

Well, sideways ofcourse! :-)

here's a cat /proc/interrupts from the (BP6) box:

           CPU0       CPU1       
  0:     104936     105433    IO-APIC-edge  timer
  1:       4444       4384    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  3:         79         59    IO-APIC-edge  serial
  4:      12743      12850    IO-APIC-edge  serial
 14:       7855       7885    IO-APIC-edge  ide0
 15:       1990       1703    IO-APIC-edge  ide1
 16:          0          0   IO-APIC-level  es1371, mga@PCI:1:0:0
 17:         24         28   IO-APIC-level  sym53c8xx
 18:          0          0   IO-APIC-level  bttv
 19:     460435     460402   IO-APIC-level  eth0, eth1, usb-uhci
NMI:     210303     210303 
LOC:     210285     210284 
ERR:          0

The interrupt which caused problems was 19 (with both network cards and USB on
it). It shows a high number of interrupts because I've been load-testing the
network. The mere fact that it shows this hig number of interrupts shows the
fix works...

As this is a BP6, I'm now supposed to go on about the dead chickens, dedicated
air conditioners, nuclear powersupplies and other magic you're supposed to buy
to get these boards running. Well, nothing of that sort, it is running on a
simple (but high quality) 235W PSU with heatgreased coolers on the CPUs and the
BX xhipset. Nothing is overclocked. CPU and chipset tmeperatures are 24.C and
32.C, respectively.

In short, nothing remarkable. All PCI slots are used, as you can see from my
first posting in this thread (which contains more info on the hardware).

//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Alan Cox]

> Could you disable both bandaids? I disabled them, no problems so far.
> Now back to the disable_irq_nosync().

Ok so it looks like the disable_irq code is buggy. Unfortunately its not
just used for these drivers they are just the heaviest users.

Given that we can see the IRQ is still set on the APIC can we fake an IRQ in
that condition ?

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Manfred Spraul]

Alan Cox wrote:
> 
> > Could you disable both bandaids? I disabled them, no problems so far.
> > Now back to the disable_irq_nosync().
> 
> Ok so it looks like the disable_irq code is buggy. Unfortunately its not
> just used for these drivers they are just the heaviest users.
> 
> Given that we can see the IRQ is still set on the APIC can we fake an IRQ in
> that condition ?

Switch to edge triggered, wait , switch back to level triggered - I've
added that to my sysrq commands, and it clears the IRR bit in the IO
APIC. Sometimes 2 or 3 attempts are required.

I tried several changes to the ioapic code, but without success.

I found:
* the io_apic_sync() in __mask_IO_APIC_irq() is probably wrong, I'd say
it should be _after_ the io_apic_modify, but currently it is before the
io_apic_modify(). 2.2 uses the same code, that doesn't explain the
problem.

* this comment in
http://oss.sgi.com/www.linux.sgi.com/intel/visws/visws.2210.28jul99.patch

+/* XXX ouch... is this really our only choice for masking this
interrupt? */
+/* XXX not fully safe for 2 reasons:
+ *     1) should not touch an apic entry while (whole) apic is enabled
+ *     2) careful about storing to IRR bit (unless we know this intr is
idle)
+ */
+static void disable_cobalt_irq(unsigned int irq)       /* disable_irq()
*/
+{
+       int ent = is_co_apic(irq);
+       if (ent == -1) {
+               return; /* could actually be a panic */
+       }
+
+       /* Note: h/w nada like read-mod-write!  Vec saved in
IRQ_VECTOR() */
+       co_apic_write(CO_APIC_LO(ent), CO_APIC_MASK);
+       (void)co_apic_read(CO_APIC_LO(ent)); /* sync cpu to cobalt apic
*/
+}
+
It's possible that the comment is about an cobalt specific problem, the
IRR bit is - according the Intel documentation - read only.


--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

On Fri, 12 Jan 2001, Alan Cox wrote:

> > Could you disable both bandaids? I disabled them, no problems so far.
> > Now back to the disable_irq_nosync().
> 
> Ok so it looks like the disable_irq code is buggy. Unfortunately its not
> just used for these drivers they are just the heaviest users.

It may well not be disable_irq() that is buggy. In fact, there's good
reason to believe that it's a hardware problem.

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Frank de Lange]

On Fri, Jan 12, 2001 at 04:36:33PM -0800, Linus Torvalds wrote:
> It may well not be disable_irq() that is buggy. In fact, there's good
> reason to believe that it's a hardware problem.

I am inclined to believe it IS a hardware problem... If disable_irq were buggy,
wouldn't the problem occur more frequently in other irq-heavy areas? A quick
count shows that disable_irq* is used in 84 sourcefiles in the driver/*
directory. This includes drivers which generate many interrupts in a short
timeframe (like ide).

Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

On Sat, 13 Jan 2001, Frank de Lange wrote:

> On Fri, Jan 12, 2001 at 04:36:33PM -0800, Linus Torvalds wrote:
> > It may well not be disable_irq() that is buggy. In fact, there's good
> > reason to believe that it's a hardware problem.
> 
> I am inclined to believe it IS a hardware problem... If disable_irq were buggy,
> wouldn't the problem occur more frequently in other irq-heavy areas? A quick
> count shows that disable_irq* is used in 84 sourcefiles in the driver/*
> directory. This includes drivers which generate many interrupts in a short
> timeframe (like ide).

IDE is not my favourite example of a "known stable driver". Also, in many
cases IDE is for historical reasons connected to an EDGE io-apic pin (ie
it's still considered an ISA interrupt). Which probably wouldn't show this
problem anyway.

Also, IDE doesn't generate all that many interrupts. You can make a
network driver do a _lot_ more interrupts than just about any disk driver
by simply sending/receiving a lot of packets. With disks it is very hard
to get the same kind of irq load - Linux will merge the requests and do at
least 1kB worth of transfer per interrupt etc. On a ne2k 100Mbps PCI card,
you can probably _easily_ generate a much higher stream of interrupts.

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Frank de Lange]

On Fri, Jan 12, 2001 at 04:56:24PM -0800, Linus Torvalds wrote:
> IDE is not my favourite example of a "known stable driver". Also, in many
> cases IDE is for historical reasons connected to an EDGE io-apic pin (ie
> it's still considered an ISA interrupt). Which probably wouldn't show this
> problem anyway.

They (ide interrupts) are indeed EDGE-triggered on my box. I have not enabled
the HPT366 (ATA66) controller on this board, so I can not tell if that
controller is EDGE-triggered as well.

> Also, IDE doesn't generate all that many interrupts. You can make a
> network driver do a _lot_ more interrupts than just about any disk driver
> by simply sending/receiving a lot of packets. With disks it is very hard
> to get the same kind of irq load - Linux will merge the requests and do at
> least 1kB worth of transfer per interrupt etc. On a ne2k 100Mbps PCI card,
> you can probably _easily_ generate a much higher stream of interrupts.

There's sound... The msnd.c (Turtle Beach MultiSound) driver (and its
derivatives, like msnd_pinnacle) uses disable_irq.  Running esd (esound
daemon), sound can easily generate > 1000 interrupts/second, since esd uses
small dma transfers. This can be seen quite clearly from /proc/interrupts on my
soundserver:

           CPU0       
  0:  276867328          XT-PIC  timer
  1:          2          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  3:    7631519          XT-PIC  eth1
  4:    2751419          XT-PIC  serial
  5: 1907346678          XT-PIC  soundblaster
  8:          1          XT-PIC  rtc
  9:   45022986          XT-PIC  eth0
 13:          1          XT-PIC  fpu
 14:    4320643          XT-PIC  ide0
 15:    4409193          XT-PIC  ide1
NMI:          0

OK, this is an ageing P166, and it uses a different driver, etc. I have not
found any problems with hanging sound drivers in Google query for 'linux msnd
bp6' or 'linux multisound bp6'. Of course, this is no conclusive evidence, far
from it... It could be that people using those cards are not the ones who tend
to go for the (somewhat tricky) BP6 board...

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Manfred Spraul]

Frank de Lange wrote:
> 
> It could be that people using those cards are not the ones who tend
> to go for the (somewhat tricky) BP6 board...
> 

I doubt that it's BP6 specific: I have the problem with a Gigabyte BXD
board and I doubt that Ingo used an BP6. Perhaps 82093AA specific (the
IO APIC chip used for SMP 440BX board)

I can't find any spec updates for that chip: either it's the first
perfect chip Intel ever produced, or ...

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Frank de Lange]

On Sat, Jan 13, 2001 at 02:51:54AM +0100, Manfred Spraul wrote:
> Frank de Lange wrote:
> > 
> > It could be that people using those cards are not the ones who tend
> > to go for the (somewhat tricky) BP6 board...
> > 
> 
> I doubt that it's BP6 specific: I have the problem with a Gigabyte BXD
> board and I doubt that Ingo used an BP6. Perhaps 82093AA specific (the
> IO APIC chip used for SMP 440BX board)

It isn't. But I just meant to indicate that the mere fact that I could not find
any problem-report for that combination does not indicate that there ARE no
problems...

> I can't find any spec updates for that chip: either it's the first
> perfect chip Intel ever produced, or ...

:-)

Well, the BX chipset is one of their better attempts I think...

Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Jens Axboe]

On Fri, Jan 12 2001, Linus Torvalds wrote:
> [...] With disks it is very hard
> to get the same kind of irq load - Linux will merge the requests and do at
> least 1kB worth of transfer per interrupt etc. On a ne2k 100Mbps PCI card,

Actually, without mult count you will do only 512b of I/O per interrupt
on IDE. Regardless of merging etc. Still doesn't reach nic levels, but
it's _bad_ anyway :-)

-- 
* Jens Axboe <axboe@suse.de>
* SuSE Labs
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Andrew Morton]

Linus Torvalds wrote:
> 
> On Sat, 13 Jan 2001, Frank de Lange wrote:
> 
> > On Fri, Jan 12, 2001 at 04:36:33PM -0800, Linus Torvalds wrote:
> > > It may well not be disable_irq() that is buggy. In fact, there's good
> > > reason to believe that it's a hardware problem.
> >
> > I am inclined to believe it IS a hardware problem... If disable_irq were buggy,
> > wouldn't the problem occur more frequently in other irq-heavy areas? A quick
> > count shows that disable_irq* is used in 84 sourcefiles in the driver/*
> > directory. This includes drivers which generate many interrupts in a short
> > timeframe (like ide).
> 
> IDE is not my favourite example of a "known stable driver". Also, in many
> cases IDE is for historical reasons connected to an EDGE io-apic pin (ie
> it's still considered an ISA interrupt). Which probably wouldn't show this
> problem anyway.
> 

3c59x calls disable_irq() once per minute, and seems to be
one of the most-affected drivers.
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

On Sat, 13 Jan 2001, Andrew Morton wrote:
> 
> 3c59x calls disable_irq() once per minute, and seems to be
> one of the most-affected drivers.

The ne2k thing seems to be the _most_ affected one, as far as I can tell.

However, it could easily be a matter of timing - for example, if the
driver does something to trigger an interrupt _just_ before (or after,
considering the asynchronous nature of writing to the IO-APIC) doing the
enable_irq(), then..

I'm also nervous about the complete lack of locking in vortex_timer():
disabling interrupts doesn't mean that transmits couldn't be
pending. But maybe the hardware is ok with changing status concurrently.

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Andrew Morton]

Linus Torvalds wrote:
> 
> I'm also nervous about the complete lack of locking in vortex_timer():
> disabling interrupts doesn't mean that transmits couldn't be
> pending. But maybe the hardware is ok with changing status concurrently.
> 

mm..  It's a little racy wrt vortex_ioctl(), but otherwise OK.
del_timer_sync() in vortex_ioctl() seems to be needed.

disable_irq() is very useful in functions such as this.  It
would be a shame to have to stop using it.
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Russell King]

Andrew Morton writes:
> Linus Torvalds wrote:
> > I'm also nervous about the complete lack of locking in vortex_timer():
> > disabling interrupts doesn't mean that transmits couldn't be
> > pending. But maybe the hardware is ok with changing status concurrently.
> 
> disable_irq() is very useful in functions such as this.  It
> would be a shame to have to stop using it.

Doesn't the NCR53C9x SCSI drivers use disable_irq() a lot?  Do they have
any problems?
   _____
  |_____| ------------------------------------------------- ---+---+-
  |   |         Russell King        rmk@arm.linux.org.uk      --- ---
  | | | | http://www.arm.linux.org.uk/personal/aboutme.html   /  /  |
  | +-+-+                                                     --- -+-
  /   |               THE developer of ARM Linux              |+| /|\
 /  | | |                                                     ---  |
    +-+-+ -------------------------------------------------  /\\\  |
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Call for testers: ne2k-pci and io apic (was: Re: QUESTION: Network hangs with BP6...)

[Manfred Spraul]

[-- Attachment #1: Type: text/plain, Size: 1057 bytes --]

Russell King wrote:
> 
> Doesn't the NCR53C9x SCSI drivers use disable_irq() a lot?  Do they have
> any problems?
>

It seems that a certain timing is necessary: one flood ping or a single
ncp usually doesn't trigger any problems, but 2 concurrent flood pings
hang the network after 5-10 seconds. It's not multi processor specific,
both I and Frank can trigger it when we boot with one cpu.

So far it seems that only the io apic for the BX chipset is affected
(only SMP BX boards contain an io apic).

Any volunteers with ne2k-pci cards and other motherboards that include
an io apic (e.g. all Intel motherboards that use an IO Controller Hub,
Via Apollo Pro133, Pro133A, KX133)?

Please:
* apply the attached patch.
* compile the kernel for SMP, or at least enable uniprocessor io apic
support.
* reboot.
* flood ping the computer with 2 concurrent flood pings from a second
computer.
* wait one minute.

According to the ICH2 documentation the IRR bit on the IO APIC is
writable - that's either a docu error, or could cause further problems.

--
	Manfred

[-- Attachment #2: patch-focus --]
[-- Type: text/plain, Size: 316 bytes --]

--- linux/arch/i386/kernel/apic.c	Tue Dec  5 21:43:48 2000
+++ linux/arch/i386/kernel/apic.c.new	Sat Jan 13 15:54:56 2001
@@ -270,7 +270,7 @@
 	 *   PCI Ne2000 networking cards and PII/PIII processors, dual
 	 *   BX chipset. ]
 	 */
-#if 0
+#if 1
 	/* Enable focus processor (bit==0) */
 	value &= ~(1<<9);
 #else

Re: Call for testers: ne2k-pci and io apic (was: Re: QUESTION: Network hangs with BP6...)

[Manfred Spraul]

It seems that noone uses a Ne2000 compatible pci NIC with a newer
motherboard (every K7 board, Intel 8xx boards, via apollo pro 133), but
I've set up a tiny web site that describes my problem:

	colorfullife.com/~manfred/io_apic

--
	Manfred
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Re: Call for testers: ne2k-pci and io apic

[J . A . Magallon]

On 2001.01.13 Manfred Spraul wrote:
> 
> Any volunteers with ne2k-pci cards and other motherboards that include
> an io apic (e.g. all Intel motherboards that use an IO Controller Hub,
> Via Apollo Pro133, Pro133A, KX133)?
> 
> Please:
> * apply the attached patch.
> * compile the kernel for SMP, or at least enable uniprocessor io apic
> support.
> * reboot..
> * flood ping the computer with 2 concurrent flood pings from a second
> computer.
> * wait one minute.
> 

Volunteer. Mine is a Realtek 8029:
00:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
        Subsystem: Realtek Semiconductor Co., Ltd. RT8029(AS)
        Flags: medium devsel, IRQ 11
        I/O ports at ef40 [size=32]

Board: SuperMicro P6DGU (440GX,PIIX4), 256Mb, 2xPII@400(Deschutes,512Kb).
The only problem is that I just have a cable connection. Is it enough
a 'loopback' connection (ie, ping myself) ? Does it goes at least until
the card and generates interrupts or stops at the kernel soft level ?
Anyways, if a 128K connection can generate enough flood for you, i'll send
you my results. I am going to test it anyways...

dmesg selected info:
I/O APIC #2 Version 17 at 0xFEC00000.
Int: type 3, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 00
Int: type 0, pol 0, trig 0, bus 2, IRQ 01, APIC ID 2, APIC INT 01
Int: type 0, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 02
Int: type 0, pol 0, trig 0, bus 2, IRQ 03, APIC ID 2, APIC INT 03
Int: type 0, pol 0, trig 0, bus 2, IRQ 04, APIC ID 2, APIC INT 04
Int: type 0, pol 0, trig 0, bus 2, IRQ 06, APIC ID 2, APIC INT 06
Int: type 0, pol 0, trig 0, bus 2, IRQ 07, APIC ID 2, APIC INT 07
Int: type 0, pol 1, trig 1, bus 2, IRQ 08, APIC ID 2, APIC INT 08
Int: type 0, pol 0, trig 0, bus 2, IRQ 09, APIC ID 2, APIC INT 09
Int: type 0, pol 0, trig 0, bus 2, IRQ 0c, APIC ID 2, APIC INT 0c
Int: type 0, pol 0, trig 0, bus 2, IRQ 0d, APIC ID 2, APIC INT 0d
Int: type 0, pol 0, trig 0, bus 2, IRQ 0e, APIC ID 2, APIC INT 0e
Int: type 0, pol 0, trig 0, bus 2, IRQ 0f, APIC ID 2, APIC INT 0f
Int: type 0, pol 3, trig 3, bus 2, IRQ 0a, APIC ID 2, APIC INT 10
Int: type 0, pol 3, trig 3, bus 2, IRQ 0b, APIC ID 2, APIC INT 11
Int: type 0, pol 3, trig 3, bus 2, IRQ 0b, APIC ID 2, APIC INT 12
Int: type 0, pol 3, trig 3, bus 2, IRQ 05, APIC ID 2, APIC INT 13
Int: type 2, pol 0, trig 0, bus 2, IRQ 00, APIC ID 2, APIC INT 17
Lint: type 3, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 00
Lint: type 1, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 01
Processors: 2
mapped APIC to ffffe000 (fee00000)
mapped IOAPIC to ffffd000 (fec00000)
..
ENABLING IO-APIC IRQs
..changing IO-APIC physical APIC ID to 2 ... ok.
Synchronizing Arb IDs.
init IO_APIC IRQs
 IO-APIC (apicid-pin) 2-0, 2-5, 2-10, 2-11, 2-20, 2-21, 2-22, 2-23 not connected
.
.TIMER: vector=49 pin1=2 pin2=0
activating NMI Watchdog ... done.
testing NMI watchdog ... OK.
number of MP IRQ sources: 18.
number of IO-APIC #2 registers: 24.
testing the IO APIC.......................

IO APIC #2......
... register #00: 02000000
......    : physical APIC id: 02
... register #01: 00170011
......     : max redirection entries: 0017
......     : IO APIC version: 0011
... register #02: 00000000
......     : arbitration: 00
... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 000 00  1    0    0   0   0    0    0    00
 01 003 03  0    0    0   0   0    1    1    39
 02 003 03  0    0    0   0   0    1    1    31
 03 003 03  0    0    0   0   0    1    1    41
 04 003 03  0    0    0   0   0    1    1    49
 05 000 00  1    0    0   0   0    0    0    00
 06 003 03  0    0    0   0   0    1    1    51
 07 003 03  0    0    0   0   0    1    1    59
 08 003 03  0    0    0   0   0    1    1    61
 09 003 03  0    0    0   0   0    1    1    69
 0a 000 00  1    0    0   0   0    0    0    00
 0b 000 00  1    0    0   0   0    0    0    00
 0c 003 03  0    0    0   0   0    1    1    71
 0d 000 00  1    0    0   0   0    0    0    00
 0e 003 03  0    0    0   0   0    1    1    79
 0f 003 03  0    0    0   0   0    1    1    81
 10 003 03  1    1    0   1   0    1    1    89
 11 003 03  1    1    0   1   0    1    1    91
 12 003 03  1    1    0   1   0    1    1    91
 13 003 03  1    1    0   1   0    1    1    99
 14 000 00  1    0    0   0   0    0    0    00
 15 000 00  1    0    0   0   0    0    0    00
 16 000 00  1    0    0   0   0    0    0    00
 17 000 00  1    0    0   0   0    0    0    00
IRQ to pin mappings:
IRQ0 -> 2
IRQ1 -> 1
IRQ3 -> 3
IRQ4 -> 4
IRQ5 -> 19
IRQ6 -> 6
IRQ7 -> 7
IRQ8 -> 8
IRQ9 -> 9
IRQ10 -> 16
IRQ11 -> 17-> 18
IRQ12 -> 12
IRQ13 -> 13
IRQ14 -> 14
IRQ15 -> 15
................................... done.
calibrating APIC timer ...
.... CPU clock speed is 400.9147 MHz.
.... host bus clock speed is 100.2284 MHz.
cpu: 0, clocks: 1002284, slice: 334094
CPU0<T0:1002272,T1:668176,D:2,S:334094,C:1002284>
cpu: 1, clocks: 1002284, slice: 334094
CPU1<T0:1002272,T1:334080,D:4,S:334094,C:1002284>
checking TSC synchronization across CPUs: passed.
Setting commenced=1, go go go
..
Board Vendor: Supermicro Inc..
Board Name: Intel 440BX/440GX.

-- 
J.A. Magallon                                                      $> cd pub
mailto:jamagallon@able.es                                          $> more beer

Linux werewolf 2.4.0-ac8 #1 SMP Fri Jan 12 18:02:50 CET 2001 i686

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Re: Call for testers: ne2k-pci and io apic (was: Re: QUESTION: Network hangs with BP6...)

[J . A . Magallon]

On 2001.01.13 Manfred Spraul wrote:
> 
> Please:
> * apply the attached patch.
> --
> 	Manfred
> --- linux/arch/i386/kernel/apic.c	Tue Dec  5 21:43:48 2000
> +++ linux/arch/i386/kernel/apic.c.new	Sat Jan 13 15:54:56 2001
> @@ -270,7 +270,7 @@
>  	 *   PCI Ne2000 networking cards and PII/PIII processors, dual
>  	 *   BX chipset. ]
>  	 */
> -#if 0
> +#if 1
>  	/* Enable focus processor (bit==0) */
>  	value &= ~(1<<9);
>  #else
> 

In my 2.4.0-ac9, that code goes to line 315 and looks like:

     *   BX chipset. ]
     */
#if 0
    /* Enable focus processor (bit==0) */
    value &= ~APIC_SPIV_FOCUS_DISABLED;
#else
    /* Disable focus processor (bit==1) */
    value |= APIC_SPIV_FOCUS_DISABLED;
#endif
    /*
     * Set spurious IRQ vector

-- 
J.A. Magallon                                                      $> cd pub
mailto:jamagallon@able.es                                          $> more beer

Linux werewolf 2.4.0-ac8 #1 SMP Fri Jan 12 18:02:50 CET 2001 i686

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Re: Call for testers: ne2k-pci and io apic

[J . A . Magallon]

On 2001.01.13 Manfred Spraul wrote:
> 
> Any volunteers with ne2k-pci cards and other motherboards that include
> an io apic (e.g. all Intel motherboards that use an IO Controller Hub,
> Via Apollo Pro133, Pro133A, KX133)?
> 

In my case, (440GX/BX, PIIX4), network goes off (both with a ping-flood
or some web browsing) with a message:

Jan 14 03:01:25 werewolf kernel: NETDEV WATCHDOG: eth0: transmit timed out
Jan 14 03:01:57 werewolf last message repeated 19 times


-- 
J.A. Magallon                                                      $> cd pub
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Linux werewolf 2.4.0-ac9 #2 SMP Sun Jan 14 01:46:07 CET 2001 i686

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Zdenek Kabelac]

Linus Torvalds wrote:
> 
> On Sat, 13 Jan 2001, Frank de Lange wrote:
> 
> IDE is not my favourite example of a "known stable driver". Also, in many
> cases IDE is for historical reasons connected to an EDGE io-apic pin (ie
> it's still considered an ISA interrupt). Which probably wouldn't show this
> problem anyway.

I've been having similar problem with my network card 3c59x. My BP6 was
hanging with 
50% probablity while running netscape from nfs mounted /usr partition).

For 2.2 kernel I've created this patch which has solved this problem
(so I don't have any problems until recentely I've started to use UDMA4
with ATA66
- but this seems to be related to BX chipset problem and as far as I
know Andre
is working on this issue)

While using this patch - I've got many messages about irq_enter in my
kernel log,
but the system was stable and running quite happy.

With the latest 2.4 kernels I do not have same problems (at least it
looks so far)
(So I assume the problem was hidden somewhere inside NFS).
However with 2.4.0 & ac patches I'm seeing some problem when one CPU is
locked
and the computer becomes unusable without any reason - there is no
network trafick
no ide intensive actions - all I can do is to move mouse within Xfree
(so maybe
its xfree bug - but its hard to recognize this - all I could say is that
I'm not seeing
such problems with -test12 kernels)


Here the patch for 2.2 I've been using:


--- linux.orig/arch/i386/kernel/irq.h   Wed May 31 11:21:04
2000                
+++ linux/arch/i386/kernel/irq.h        Wed May 31 11:21:47
2000                
@@ -138,8 +138,22
@@                                                            
 static inline void irq_enter(int cpu, unsigned int
irq)                        

{                                                                              
       
hardirq_enter(cpu);                                                     
-       while (test_bit(0,&global_irq_lock))
{                                  
-               /* nothing
*/;                                                  
+       if (global_irq_holder == cpu && test_bit(0, &global_irq_lock))
{        
+                printk(KERN_WARNING "irq_enter - CPU:%d already holder
(count:%
+                       cpu, global_irq_count,
local_irq_count[cpu]);           
+                /* avoid deadlock bellow
*/                                    
+               
clear_bit(0,&global_irq_lock);                                 
+        } else
{                                                               
+            unsigned long i =
1000000;                                         
+            while (test_bit(0,&global_irq_lock) && i)
{                        
+               
i--;                                                           
+                /* nothing
*/;                                                 
+           
}                                                                  
+            if (!i)
{                                                          
+               
clear_bit(0,&global_irq_lock);                                 
+                printk(KERN_WARNING "irq_enter - loop timeout CPU:%d 
Holder:%d!
+                       cpu,
global_irq_holder);                                
+           
}                                                                  
       
}                                                                       

}                                                                              
               printk(KERN_WARNING "irq_enter - loop timeout CPU:%d 
Holder:%d!

-- 
             There are three types of people in the world:
               those who can count, and those who can't.
  Zdenek Kabelac  http://i.am/kabi/ kabi@i.am {debian.org; fi.muni.cz}

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Manfred Spraul]

Linus Torvalds wrote:
> 
> It may well not be disable_irq() that is buggy. In fact, there's good
> reason to believe that it's a hardware problem.
> 
Perhaps a problem with the 82093AA external IO APIC used for 440BX
board? I haven't seen any reports from newer Intel boards (the ICH2
includes an IO APIC) or from Via boards.

The problem is not SMP specific: Frank wrote that it also occured when
he booted with "max_cpus=1".

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Andrew Morton]

Alan Cox wrote:
> 
> > Could you disable both bandaids? I disabled them, no problems so far.
> > Now back to the disable_irq_nosync().
> 
> Ok so it looks like the disable_irq code is buggy. Unfortunately its not
> just used for these drivers they are just the heaviest users.
> 
> Given that we can see the IRQ is still set on the APIC can we fake an IRQ in
> that condition ?

As you think about this problem, please bear in mind that
this loss of APIC interrupts also occurs in 2.2 kernels.

Donald may have more details.

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Alan Cox]

> Frank, could you try what happens with the NMI oopser disabled?
> 
> The second major difference I'm immediately aware of is the number of
> the reschedule/tlb flush/etc interrupt: 2.2 uses the lowest priority,
> 2.4 the highest priority.

Im trying to remember what they were, but some APIC versions do have errata
and someting about 3 irqs at the same priority level rings a bell.


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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Manfred Spraul]

Alan Cox wrote:
> 
> > Frank, could you try what happens with the NMI oopser disabled?
> >
> > The second major difference I'm immediately aware of is the number of
> > the reschedule/tlb flush/etc interrupt: 2.2 uses the lowest priority,
> > 2.4 the highest priority.
> 
> Im trying to remember what they were, but some APIC versions do have errata
> and someting about 3 irqs at the same priority level rings a bell.

The PPro local apic documentation says:
<<<<<<<
The processor's local APIC includes an in-service entry and a holding
entry for each priority level. To avoid losing interrupts, software
should allocate no more than 2 interrupt vectors per priority.
>>>>>>>>

Ok, we must reorder the vector numbers for our own interrupts
(0xfb-0xff), but that doesn't explain our problems: we don't loose
reschedule interrupts, we have problems with normal interrupts - and
there we only use 2 irq at the same priority level.

Btw, the kick patch I sent a few minutes ago revives my io apic.

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Ingo Molnar]

On Fri, 12 Jan 2001, Manfred Spraul wrote:

> The PPro local apic documentation says:
> <<<<<<<
> The processor's local APIC includes an in-service entry and a holding
> entry for each priority level. To avoid losing interrupts, software
> should allocate no more than 2 interrupt vectors per priority.
> >>>>>>>>
>
> Ok, we must reorder the vector numbers for our own interrupts
> (0xfb-0xff), but that doesn't explain our problems: we don't loose
> reschedule interrupts, we have problems with normal interrupts - and
> there we only use 2 irq at the same priority level.

we *already* reorder vector numbers and spread them out as much as
possible. We do this in 2.2 as well. We did this almost from day 1 of
IO-APIC support. If any manually allocated IRQ vector creates a '3 vectors
in the same 16-vector region' situation then thats a bug in hw_irq.h..

the 'loss of interrupts' above does not include external interrupts, only
local interrupts (such as the APIC timer interrupt) can get lost in such a
situation.

(nevertheless there is something going on.)

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Manfred Spraul]

Ingo Molnar wrote:
> 
> we *already* reorder vector numbers and spread them out as much as
> possible. We do this in 2.2 as well. We did this almost from day 1 of
> IO-APIC support. If any manually allocated IRQ vector creates a '3 vectors
> in the same 16-vector region' situation then thats a bug in hw_irq.h..
> 
I reread the 2.2 and 2.4 code:

2.2 spreads all vectors, even the internal interrupts (tlb flush,
reschedule, timer, call function) are spread.
Hmm. AFAICS there is one bug: 3 interrupts are in priority 5:

CALL_FUNCTION_VECTOR	0x50
IRQ0_TRAP_VECTOR	0x51
irq1: irq0+8		0x59

check arch/i386/kernel/irq.h and assign_irq_vector (io_apic.c)

2.4 spreads the vectors for the external (hardware, from io apic)
interrupts, but 5 ipi vectors have the same priority: reschedule, call
function, tlb invalidate, apic error, spurious interrupt.

But that doesn't explain what happens with ne2k cards: neither 2.2 nor
2.4 have more than 2 interrupts in class for the hardware interrupt
16/19.
With 2.2 I don't have any problems, 2.4 hangs.

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Ingo Molnar]

On Fri, 12 Jan 2001, Manfred Spraul wrote:

> 2.4 spreads the vectors for the external (hardware, from io apic)
> interrupts, but 5 ipi vectors have the same priority: reschedule, call
> function, tlb invalidate, apic error, spurious interrupt.

my reading of the errata is that the lost APIC timer IRQ happens only if
the APIC timer IRQ vector's priority level has more than 2 active vectors.
It's a very limited case, which does not happen in recent CPUs anyway
(such as the PIII).

> But that doesn't explain what happens with ne2k cards: neither 2.2 nor
> 2.4 have more than 2 interrupts in class for the hardware interrupt
> 16/19.

yep.

	Ingo

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

In article <3A5F4827.2E443786@colorfullife.com>,
Manfred Spraul  <manfred@colorfullife.com> wrote:
>The processor's local APIC includes an in-service entry and a holding
>entry for each priority level. To avoid losing interrupts, software
>should allocate no more than 2 interrupt vectors per priority.
>>>>>>>>>
>
>Ok, we must reorder the vector numbers for our own interrupts
>(0xfb-0xff), but that doesn't explain our problems: we don't loose
>reschedule interrupts, we have problems with normal interrupts - and
>there we only use 2 irq at the same priority level.
>
>Btw, the kick patch I sent a few minutes ago revives my io apic.

Does this seem to happen mainly with drivers that use "disable_irq()"
and "enable_irq()"? I know the ne drivers do (through the 8390 module),
and some others do too (3c59x). 

"disable_irq()"/"enable_irq()" has always tended to be slightly
problematic.  It's not a set of semantics that maps well onto all
interrupt controllers (io-apic definitely included).  Drivers would
generally be better off if they disabled their own chip from sending
interrupts, rather than disabling the interrupt line the chip is on. 

(Of course, most drivers would be even _better_ off if they didn't play
games with irq disabling at all, but I think the 8390 driver does it
because otherwise it would suck too badly for words). 

If you are seeing this with a 8390 core, try to see if the problem goes
away if you remove the "disable_irq_nosync(dev->irq);" and
"enable_irq()" thing (which means that you need to change the
spinlocking at the same place to use irq-safe versions - this _will_
make for bad interrupt latency especially with ISA ne2000 cards, but it
would be interesting to hear if it makes the problem less likely to
happen). 

		Linus
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Alan Cox]

> interrupt controllers (io-apic definitely included).  Drivers would
> generally be better off if they disabled their own chip from sending
> interrupts, rather than disabling the interrupt line the chip is on. 

That doesn't work very well because the device irq can arrive a measurable
number of clocks after you disable it on the source and there is no way to
say 'and be sure the stupid thing has propogated the apic bus'

Alan

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

On Fri, 12 Jan 2001, Alan Cox wrote:

> > interrupt controllers (io-apic definitely included).  Drivers would
> > generally be better off if they disabled their own chip from sending
> > interrupts, rather than disabling the interrupt line the chip is on. 
> 
> That doesn't work very well because the device irq can arrive a measurable
> number of clocks after you disable it on the source and there is no way to
> say 'and be sure the stupid thing has propogated the apic bus'

I agree. Asynchronous buses are nasty that way. However, if your "locking"
is based on device state, you can still do it: you just have to have an
internal device protocol. The simplest example of this is:

	interrupt_handler()
	{
		status = readl(dev->status);
		if (status & MY_IRQ_DISABLE)
			return;

	}


	{
		status = readl(dev->status);
		writel(dev->status, status | MY_IRQ_DISABLE);
		spin_lock();
		.. critical region ..
		spin_unlock();
		writel(dev->status, status);
	}


Notice how the above does NOT guarantee that the physical interrupt might
not be "in flight". It does, however, synchronize other ways, simply by
virtue of using the _synchronous_ bus (PCI, in this case) to figure out
when the asynchronous bus (interrupts) has a bogus event.

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Alan Cox]

> 	interrupt_handler()
> 	{
> 		status = readl(dev->status);
> 		if (status & MY_IRQ_DISABLE)
> 			return;

Unfortunately on the 8390 the IRQ statud register is on page 0. The code
on the other CPU might not be on page 0. That means we can't even safely
check if there is an irq pending or clear it down (bad news on ne2k-pci)
without getting that lock.

That means we have to be able to just block that one irq source to avoid
horrible SMP latency problems. 

Alan

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

On Sat, 13 Jan 2001, Alan Cox wrote:

> > 	interrupt_handler()
> > 	{
> > 		status = readl(dev->status);
> > 		if (status & MY_IRQ_DISABLE)
> > 			return;
> 
> Unfortunately on the 8390 the IRQ statud register is on page 0. The code
> on the other CPU might not be on page 0. That means we can't even safely
> check if there is an irq pending or clear it down (bad news on ne2k-pci)
> without getting that lock.

Alan.

THINK.

The "synchronous channel" can be _memory_. I just used the above as an
example of using a synchronous channel to make sure that the asynchronous
buses aren't screwing us.

You only need one bit of synchronous information. The example used the
very same bit that the irq flag on the device is anyway - which works on a
lot of devices simply because they need to read the status flags anyway
in order to handle the interrupt.

But if you have problems with that, just use an atomic flag off
"dev->private" instead. Big deal.

		Linus

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Frank de Lange]

As per Linus' suggestion, I removed the disable_irq/enable_irq statements from
the 8390 core driver, and replace the spinlocks with irq-safe versions. This
seems to solve the network hangs, as I am currently running a heavy network
load (which would have killed a non-patched driver within seconds). Network
latency seems a bit higher, and there are some hiccups in the streaming audio
(part of the network load, easy indicator of performance...), but no hangs.
Here's the patch:

--- linux/drivers/net/8390.c.org	Fri Jan 12 19:52:38 2001
+++ linux/drivers/net/8390.c	Fri Jan 12 19:54:50 2001
@@ -242,15 +242,15 @@
 
 	/* Ugly but a reset can be slow, yet must be protected */
 		
-	disable_irq_nosync(dev->irq);
-	spin_lock(&ei_local->page_lock);
+	/* disable_irq_nosync(dev->irq); */
+	spin_lock_irq(&ei_local->page_lock);
 		
 	/* Try to restart the card.  Perhaps the user has fixed something. */
 	ei_reset_8390(dev);
 	NS8390_init(dev, 1);
 		
-	spin_unlock(&ei_local->page_lock);
-	enable_irq(dev->irq);
+	spin_unlock_irq(&ei_local->page_lock);
+	/* enable_irq(dev->irq); */
 	netif_wake_queue(dev);
 }
     
@@ -285,9 +285,9 @@
 	 *	Slow phase with lock held.
 	 */
 	 
-	disable_irq_nosync(dev->irq);
+	/* disable_irq_nosync(dev->irq); */
 	
-	spin_lock(&ei_local->page_lock);
+	spin_lock_irq(&ei_local->page_lock);
 	
 	ei_local->irqlock = 1;
 
@@ -383,8 +383,8 @@
 	ei_local->irqlock = 0;
 	outb_p(ENISR_ALL, e8390_base + EN0_IMR);
 	
-	spin_unlock(&ei_local->page_lock);
-	enable_irq(dev->irq);
+	spin_unlock_irq(&ei_local->page_lock);
+	/* enable_irq(dev->irq); */
 
 	dev_kfree_skb (skb);
 	ei_local->stat.tx_bytes += send_length;

-- 
  WWWWW      _______________________
 ## o o\    /     Frank de Lange     \
 }#   \|   /                          \
  ##---# _/     <Hacker for Hire>      \
   ####   \      +31-320-252965        /
           \    frank@unternet.org    /
            -------------------------
 [ "Omnis enim res, quae dando non deficit, dum habetur
    et non datur, nondum habetur, quomodo habenda est."  ]
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Linus Torvalds]

In article <20010112200541.A25675@unternet.org>,
Frank de Lange  <frank@unternet.org> wrote:
>As per Linus' suggestion, I removed the disable_irq/enable_irq statements from
>the 8390 core driver, and replace the spinlocks with irq-safe versions. This
>seems to solve the network hangs, as I am currently running a heavy network
>load (which would have killed a non-patched driver within seconds). Network
>latency seems a bit higher, and there are some hiccups in the streaming audio
>(part of the network load, easy indicator of performance...), but no hangs.

Ok, so it's tentatively the IOAPIC disable/enable code.  But it could
obviously be something that just interacts with it, including just a
timing issue (ie the _real_ bug might just be bad behaviour when
changing IO-APIC state at the same time as an interrupt happens, and
disable/enable-irq just happen to be the only things that do it at a
high enough frequency that you can see the problem). 

Remind me: what polarity are your io-apic irq's? Level, edge, sideways?
Anything else that might be relevant?

		Linus
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware

[Roeland Th. Jansen]

On Fri, Jan 12, 2001 at 12:04:21PM -0800, Linus Torvalds wrote:
> Ok, so it's tentatively the IOAPIC disable/enable code.  But it could
> obviously be something that just interacts with it, including just a
> timing issue (ie the _real_ bug might just be bad behaviour when
> changing IO-APIC state at the same time as an interrupt happens, and
> disable/enable-irq just happen to be the only things that do it at a
> high enough frequency that you can see the problem). 


my BP6 with the patch frank sent me and the apic code at line 273 (or
so) defined as '1' and a flood ping :

Jan 14 19:56:19 grobbebol kernel: APIC error on CPU1: 02(02)
Jan 14 19:56:25 grobbebol kernel: APIC error on CPU1: 02(02)
Jan 14 19:58:10 grobbebol last message repeated 2 times
Jan 14 20:00:01 grobbebol kernel: APIC error on CPU1: 02(02)
Jan 14 20:01:11 grobbebol last message repeated 2 times
Jan 14 20:01:48 grobbebol kernel: APIC error on CPU1: 02(02)
Jan 14 20:01:59 grobbebol kernel: APIC error on CPU1: 02(08)
Jan 14 20:02:10 grobbebol kernel: APIC error on CPU1: 08(08)
Jan 14 20:02:39 grobbebol kernel: APIC error on CPU1: 08(02)
Jan 14 20:02:39 grobbebol kernel: unexpected IRQ trap at vector 8d
Jan 14 20:15:32 grobbebol kernel: APIC error on CPU1: 02(08)
[....]


ad the network is dead. however, no crashes seen during this.
-- 
Grobbebol's Home                   |  Don't give in to spammers.   -o)
http://www.xs4all.nl/~bengel       | Use your real e-mail address   /\
Linux 2.2.16 SMP 2x466MHz / 256 MB |        on Usenet.             _\_v  
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Latest status of IDE patches from Andre

[Jeff Nguyen]

Hi Alan,

Will you incorporate Andre IDE patches into the 2.2.19preXX
kernel? If not, do you have any plan to do so in the very near future? 
I know this issue has been discussed before. But there has not been
any progress.

I have been following the kernel development for years. I have seen
many drivers added to the kernel. Some weren't working properly
and had to be removed quickly. Strangely, the IDE patches drag on
and on after all the kernel releases.

Are you still concern about the stability of the driver?  

Regards,

Jeff

ASL Inc.

 

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Maciej W. Rozycki]

On Fri, 12 Jan 2001, Frank de Lange wrote:

[I've cut syslog junk away for clarity -- you could just do `dmesg -s 32768'.]
> before network hang
> ===================
[...]
>  NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
[...]
>  13 0FF 0F  0    1    0   1   0    1    1    99
[...]
> printing local APIC contents on CPU#0/0:
[...]
> ... APIC TMR field:
> 0123456789abcdef0123456789abcdef
[...]
> 00000000010000000000000001000000
                           ^
[...]
> printing local APIC contents on CPU#1/1:
[...]
> ... APIC TMR field:
> 0123456789abcdef0123456789abcdef
[...]
> 00000000000000000000000001000000
                           ^
[...]

 Here everything is fine.  Vector 0x99 (the one you are having troubles
with) is set up as level-triggered (Trig is 1) and the respective bits of
the Trigger Mode Register (TMR) of the local APIC of both CPUs are set,
i.e. the last 0x99 IRQ processed was level-triggered as expected.  As a
part of the ususal inter-APIC handshake for level-triggered interrupts an
EOI message was sent to the originating I/O APIC (IRR is 0) to inform it,
it's free to send the IRQ again if still asserted. 

> after network hang
> ==================
[...]
> NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:
[...]
>  13 0FF 0F  0    1    1   1   0    1    1    99
[...]
> printing local APIC contents on CPU#1/1:
[...]
> ... APIC TMR field:
> 0123456789abcdef0123456789abcdef
[...]
> 00000000000000000000000001000000
                           ^
> printing local APIC contents on CPU#0/0:
[...]
> ... APIC TMR field:
> 0123456789abcdef0123456789abcdef
[...]
> 00000000010000000000000000000000
                           ^ Gotcha!
[...]

 Here the last 0x99 IRQ delivered to CPU#1 was fine, just like before. 
But the last 0x99 IRQ CPU#0 received was apparently delivered as
edge-triggered -- the respective bits of the Trigger Mode Register (TMR)
of the local APIC is cleared.  Hence the local APIC decided no EOI message
is needed for the originating I/O APIC as edge-triggered interrupts are
always sent by an I/O APIC whenever arriving (it's not possible for
level-triggered ones as an IRQ storm would result).  Upon receiving an EOI
command from Linux the local APIC decides everything is finished and the
I/O APIC is left stuck with the IRR bit set to 1.  It's still waiting for
an EOI message to arrive for further 0x99 IRQs to send.

 How could it happen?  Well, I guess a transmission error could have
happened that remained unnoticed by the checksumming hardware.  As the
checksum algorithm is pretty trivial -- a cumulative sum of 2-bit values
-- it might just have happened two bits got toggled.  I believe such
errors are happening due to marginal hardware -- not every i386 SMP box
shows this problem, even if a high volume of level-triggered interrupts is
observed. 

 Thank you very much for the log.  I already have an idea how to
automatically recover from such a situation.  No driver change is required
-- apparently no driver is at fault, it's just a load of the inter-APIC
bus, I/O APICs (including system bus accesses) or the whole system in
general. 

 I'm hereby asking everyone not to modify drivers just to circumvent APIC
lock-ups.  Especially if such changes would "punish" perfectly good
systems.  It won't cure anything -- it might only make it happen less
frequently due to different conditions.  I hope to have changes ready to
test by the next week.

  Maciej

-- 
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

Let's decode it:

> IO APIC #2...... 
> NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect: 
> 12 0FF 0F 0 1 0 1 0 1 1 91 
> 13 0FF 0F 0 1 1 1 0 1 1 99 

IRR for interrupt 19 is set, that means the IO APIC has sent the
interrupt to a cpu but not yet received the corresponding EOI.

That bit is read only, so we can't set it to 0 to kick the io apic.

The Vector is 99, we must check that bit in the ISR, TMR and IRR of both
cpus.

cpu1:
> ISR: all bits 0
> TMR: only bit 0x99 is set
> IRR: all bits 0

cpu0:
> ISR: all bits 0
> TMR: only bit 0x89 is set
> IRR: bit 0xfc and bit 0xef are set.

ISR is the in-server register, 0 means that the cpu is not processing an
interrupt right now.

TMR is the trigger mode registers, 1 means that the local apic should
send an EOI to the io apic when the cpu signals the EOI to the local
apic.


IRR is the list of pending interrupts:
0xef is the local timer interrupt,
0xfc is the reschedule interrupt
(see include/asm-i386/hw_irq.h)

These bits are also read only.

If you search the IO APIC documentation: number 29056601 - just search
with google. The local APIC is documented in the main cpu handbook (PPro
or later), in the chapter about multiple processor management 

--
	Manfred
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[David Woodhouse]

manfred@colorfullife.com said:
> IRR for interrupt 19 is set, that means the IO APIC has sent the
> interrupt to a cpu but not yet received the corresponding EOI.

OK, but couldn't we reset it by sending an extra EOI when the drivers 
decide that they've missed interrupts?

--
dwmw2


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QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

Hi'all,

Ever since I put two ethernet-cards (cheap Winbond W89C940 based PCI NE2K
clones) in my BP-6 system, I've been experiencing intermittent network hangs. A
hang manifests itself as a total failure to communicate through either network
card, and can only be solved by rebooting. Removing and reloading the modules
does not fix the problem, only a reboot works.

I have searched high and low for possible causes, but I found no definite
answer. I suspect the problem may be hardware-related (the BP-6 can be tricky
sometimes), but I want to rule out software issues before I take the system
apart. So, my question: does anyone else experience these network-related
problems with a BP-6 based system? Or maybe other similar problems, where a
specific subsystem hangs an can only be revived by rebooting the box? The
network cards are currently in PCI4 and PCI5 (which should work, they are
NON-busmastering cards after all...), but relocating the cards does not solve
the problem. This problem has been nagging me ever since I moved to 2.3.x
(somewhere around 2.3.30). As it is intermittent, it is very difficult to pin
down. I suspect the APIC in not completely sane, or some timing on the bus is
out of spec, but that's no more than a suspicion. And since I do not have
access to a logic analyzer it is somewhat hard to prove...

Here's a lspci for the box:

00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (rev 03)
00:01.0 PCI bridge: Intel Corporation 440BX/ZX - 82443BX/ZX AGP bridge (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
00:07.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01)
00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
00:09.0 Ethernet controller: Winbond Electronics Corp W89C940
00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 (rev 02)
00:0b.1 Multimedia controller: Brooktree Corporation Bt878 (rev 02)
00:0d.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c875 (rev 26)
00:0f.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 06)
00:11.0 Ethernet controller: Winbond Electronics Corp W89C940 (rev 0b)
00:13.0 Unknown mass storage controller: Triones Technologies, Inc. HPT366 (rev 01)
00:13.1 Unknown mass storage controller: Triones Technologies, Inc. HPT366 (rev 01)
01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 04)

and here's a cat /proc/<interesting_file>

/proc/cpuinfo shows this box contains dual Celeron 466's (non-overclocked)

/proc/interrupts:
           CPU0       CPU1       
  0:   10003353    9483961    IO-APIC-edge  timer
  1:      85449      84279    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  3:        167        249    IO-APIC-edge  serial
  4:     380807     381140    IO-APIC-edge  serial
 14:     136991     132077    IO-APIC-edge  ide0
 15:      25836      24605    IO-APIC-edge  ide1
 16:      42510      42482   IO-APIC-level  es1371, mga@PCI:1:0:0
 17:         26         26   IO-APIC-level  sym53c8xx
 18:       9287       8837   IO-APIC-level  bttv
 19:     205294     205191   IO-APIC-level  eth0, eth1, usb-uhci
NMI:   19487238   19487238 
LOC:   19488621   19488620 
ERR:          0

/proc/meminfo:
        total:    used:    free:  shared: buffers:  cached:
Mem:  261984256 260354048  1630208        0 12873728 99012608
Swap: 511926272 14245888 497680384
...
...

# network cards share IRQ with USB, which hosts...
/proc/bus/usb/devices:
T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc= 11/900 us ( 1%), #Int=  1, #Iso=  0
D:  Ver= 1.00 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB UHCI Root Hub
S:  SerialNumber=c000
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   8 Ivl=255ms
T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
D:  Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=03f0 ProdID=0401 Rev= 1.00
S:  Product=HP ScanJet 5200C
S:  SerialNumber=SG95D1720ZHT
C:* #Ifs= 1 Cfg#= 1 Atr=60 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=00(>ifc ) Sub=00 Prot=00 Driver=usbscanner
E:  Ad=81(I) Atr=02(Bulk) MxPS=  64 Ivl=  0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  16 Ivl=  0ms
E:  Ad=83(I) Atr=03(Int.) MxPS=   1 Ivl=250ms

uname -a:
Linux behemoth.localnet 2.4.0 #1 SMP Fri Jan 5 15:41:39 CET 2001 i686 unknown

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Manfred Spraul]

Frank de Lange wrote:
> 
> Hi'all,
> 
> Ever since I put two ethernet-cards (cheap Winbond W89C940 based PCI NE2K
> clones) in my BP-6 system, I've been experiencing intermittent network hangs.
>

Which driver do you use? The driver in 2.4.0 contains several bugfixes.
If that driver still hangs then I'll double check the documentation.

> A
> hang manifests itself as a total failure to communicate through either network
> card, and can only be solved by rebooting. Removing and reloading the modules
> does not fix the problem, only a reboot works.
> 

That's different from my problems:
unload+reload always fixed my problems with the unpatch winbond-840
driver.

> which should work, they are
> NON-busmastering cards after all...),
third line in w840_probe1():

	pci_set_master().

And the documentation begins with
W89C840F
	PCI Bus Master Fast Ethernet LAN Controller.


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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Wed, Jan 10, 2001 at 11:21:49PM +0100, Manfred Spraul wrote:
> Which driver do you use? The driver in 2.4.0 contains several bugfixes.
> If that driver still hangs then I'll double check the documentation.

The NE2K PCI one... I'll try to fiddle around with the driver, who knows...

> And the documentation begins with
> W89C840F
> 	PCI Bus Master Fast Ethernet LAN Controller.

That is the 'F' (Fast) version. My cards are just plain and simple 10base2/T,
humble and non-busmastering (AFAIK).

Cheers//Frank


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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Wed, Jan 10, 2001 at 11:21:49PM +0100, Manfred Spraul wrote:
> > which should work, they are
> > NON-busmastering cards after all...),
> third line in w840_probe1():
> 
> 	pci_set_master().
> 
> And the documentation begins with
> W89C840F
> 	PCI Bus Master Fast Ethernet LAN Controller.

...in addition to my previous reply, your cards use the Winbond 840 series,
while my cards use the 940 series. Higher number, but a less capabpe chipset or
so it seems...

Hm, but that reminds me not to get 840's to solve my problems :-)

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Andrew Morton]

Frank de Lange wrote:
> 
> Hi'all,
> 
> Ever since I put two ethernet-cards (cheap Winbond W89C940 based PCI NE2K
> clones) in my BP-6 system, I've been experiencing intermittent network hangs. A
> hang manifests itself as a total failure to communicate through either network
> card, and can only be solved by rebooting. Removing and reloading the modules
> does not fix the problem, only a reboot works.
> 

Losing both NICs at the same time could be the elusive "APIC
stops generating interrupts" problem.

Do you get any transmit timeout messages in the logs?  If
so, send them.

Does it happen with a uniprocessor build?

Are you able to boot with the `noapic' LILO option?
If so, does that make it stop?

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Thu, Jan 11, 2001 at 10:48:23PM +1100, Andrew Morton wrote:
> Losing both NICs at the same time could be the elusive "APIC
> stops generating interrupts" problem.

Yup, that's what I thought... But the real question is, is this a
software/configuration problem or a hardware problem which can only be fixed by
physically changing something on the board?... As it is, as you call it,
'elusive', it is a b*tch to pinpoint the source of these problems...

> Do you get any transmit timeout messages in the logs?  If
> so, send them.

Here they are (marked with ***):

grep -B2 -A2 transmit /var/log/messages:
    Jan 10 22:24:47 behemoth kernel: usb_control/bulk_msg: timeout 
    Jan 10 22:24:50 behemoth kernel: usb_control/bulk_msg: timeout 
*** Jan 10 22:56:51 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
    Jan 10 22:57:03 behemoth last message repeated 7 times
    Jan 10 22:57:03 behemoth kernel: SysRq: Emergency Sync 
    --
    Jan 10 22:57:09 behemoth kernel: Syncing device 16:07 ... OK 
    Jan 10 22:57:09 behemoth kernel: Done. 
*** Jan 10 22:57:09 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
    Jan 10 22:57:09 behemoth kernel: SysRq: Emergency Sync 
    Jan 10 22:57:09 behemoth kernel: Syncing device 03:01 ... OK 

> Does it happen with a uniprocessor build?

Not tried yet, since I wanna use both CPU's :-).

> Are you able to boot with the `noapic' LILO option?

I am, and did it a while ago. As far as I remember, it did not make it stop...
I'll try again (even though it is not a real solution, since that APIC is there
for a reason...)

Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

> Do you get any transmit timeout messages in the logs?  If
> so, send them.

In addition to my previous message, here's what I get from the debug log
facility:

Jan 10 22:56:51 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:51 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=33. 
Jan 10 22:56:52 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:52 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=26. 
Jan 10 22:56:53 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:53 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=30. 
Jan 10 22:56:56 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:56 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=78. 
Jan 10 22:56:56 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:56 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=32. 
Jan 10 22:56:58 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:56:58 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=89. 
Jan 10 22:57:00 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:57:00 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=77. 
Jan 10 22:57:03 behemoth kernel: NETDEV WATCHDOG: eth0: transmit timed out 
Jan 10 22:57:03 behemoth kernel: eth0: Tx timed out, lost interrupt? TSR=0x3, ISR=0x3, t=171. 

So yeah, I get timeouts allright...

Currently running NOAPIC, pity to see CPU1 receiving no interrupts at all... In the same debug log I now just saw this:

Jan 11 17:37:05 behemoth kernel: spurious 8259A interrupt: IRQ7

That's weird, since there's nothing there...:

cat /proc/interrupts 
           CPU0       CPU1       
  0:     232967          0          XT-PIC  timer
  1:       6424          0          XT-PIC  keyboard
  2:          0          0          XT-PIC  cascade
  3:        138          0          XT-PIC  serial
  4:      46201          0          XT-PIC  serial
  9:         52          0          XT-PIC  sym53c8xx
 10:     744329          0          XT-PIC  eth0, eth1, usb-uhci
 11:          0          0          XT-PIC  bttv
 12:          0          0          XT-PIC  es1371, mga@PCI:1:0:0
 14:      19778          0          XT-PIC  ide0
 15:       4520          0          XT-PIC  ide1
NMI:          0          0 
LOC:     232916     232914 
ERR:          1

See? Nothing on 7... This is with NOAPIC (as you can see from the XT-PIC's in
the above dump). BP6 again?

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

Here's another posting to the list which mentions problems with NE2K and BP6:

http://web.gnu.walfield.org/mail-archive/linux-kernel/2000-August/0132.html

"...In another machine, a dual celeron abit-bp6, recent 2.3.x kernels seem to 
dislike my realtek 8029 NIC. (I know, it's garbage plugged in to 
garbage...) The network card will die randomly, usually when I'm sending 
large amounts of data. When it dies, there are no kernel messages, and 
the interrupt count in /proc/interrupts for the card stop changing. Minor 
(painful) experimentation has shown that if the card is sharing the 
interrupt with anything else (say, ide2), it takes that with it. This 
only happens in "newer" kernels, it's fine in 2.2.16, and in some earlier 
2.3.x kernels. It goes away if I boot with the noapic=1 kernel parameter, 
and seems to be replaced with harmless "spurious 8259A interrupt: IRQ7." 
messages. (I haven't configured any hardware at all to be on IRQ7 - 
though I'm lead to believe IRQ7 has some sort of special purpose) ..."

So I'm not the only one...

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Thu, Jan 11, 2001 at 02:23:53PM -0500, Jeff Garzik wrote:
> Just out of curiosity, if you boot a Linux 2.4.0 kernel with the
> "noapic" command line option, does behavior improve?

For the curious, here's a summary of some tests I did:

apic, 2 cpu's, no smp affinity -> network hangs under load
apic, maxcpus=1, no smp affinity -> network hangs under load
apic, 2 cpu's, smp affinity for all irq's on CPU1 -> network hangs under load
noapic, 2 cpu's, no smp affinity -> NO HANG, WORKSFORME

Quick and dirty conclusion: as soon as the apic comes in to play, things get
messy...

ps. load == 2 simultaneous nfs cp -rd <big_directory> sessions and streaming
esd audio over the network

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Andrew Morton]

Frank de Lange wrote:
> 
> Quick and dirty conclusion: as soon as the apic comes in to play, things get
> messy...

Yup.

Frank, for over a year there have been sporadic reports
of APIC's forgetting how to deliver interrupts.  Not only
on BP6's.  Often with 3com NICs, so I've never been 100% sure
that it's not a failure in the NIC.

In your case, you have three devices on the same IRQ and
they all go to lunch at the same time.  That's pretty
convincing.

Nobody has been able to repeat this frequently enough
for any useful debugging to be done. Don't go away!

Here is a debugging patch.  Could you please apply this,
rebuild and:

1: Type ALT-SYSRQ-A when everything is good
2: Type ALT-SYSRQ-A when everything is bad
3: send the resulting logs.

I've Cc'ed Maciej, who understands this stuff.





--- linux-2.4.0-test11.macro/arch/i386/kernel/io_apic.c	Thu Oct  5 21:08:17 2000
+++ linux-2.4.0-test11/arch/i386/kernel/io_apic.c	Sun Nov 26 12:39:01 2000
@@ -692,7 +692,7 @@ void __init UNEXPECTED_IO_APIC(void)
 	printk(KERN_WARNING "          to linux-smp@vger.kernel.org\n");
 }
 
-void __init print_IO_APIC(void)
+void /*__init*/ print_IO_APIC(void)
 {
 	int apic, i;
 	struct IO_APIC_reg_00 reg_00;
diff -up --recursive --new-file linux-2.4.0-test11.macro/drivers/char/sysrq.c linux-2.4.0-test11/drivers/char/sysrq.c
--- linux-2.4.0-test11.macro/drivers/char/sysrq.c	Tue Nov 14 10:24:52 2000
+++ linux-2.4.0-test11/drivers/char/sysrq.c	Sun Nov 26 12:42:11 2000
@@ -72,6 +72,15 @@ void handle_sysrq(int key, struct pt_reg
 	console_loglevel = 7;
 	printk(KERN_INFO "SysRq: ");
 	switch (key) {
+	case 'a':
+		printk("\n");
+		printk("print_PIC()\n");
+		print_PIC();
+		printk("print_IO_APIC()\n");
+		print_IO_APIC();
+		printk("print_all_local_APICs()\n");
+		print_all_local_APICs();
+		break;
 	case 'r':					    /* R -- Reset raw mode */
 		if (kbd) {
 			kbd->kbdmode = VC_XLATE;
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 10:40:04PM +1100, Andrew Morton wrote:
> Frank de Lange wrote:
> > 
> > Quick and dirty conclusion: as soon as the apic comes in to play, things get
> > messy...
> Here is a debugging patch.  Could you please apply this,
> rebuild and:
> 
> 1: Type ALT-SYSRQ-A when everything is good
> 2: Type ALT-SYSRQ-A when everything is bad
> 3: send the resulting logs.

WillCo...

Now rebuilding...


Cheers//Frank

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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Fri, Jan 12, 2001 at 10:40:04PM +1100, Andrew Morton wrote:
> Here is a debugging patch.  Could you please apply this,
> rebuild and:
> 
> 1: Type ALT-SYSRQ-A when everything is good
> 2: Type ALT-SYSRQ-A when everything is bad
> 3: send the resulting logs.

OK, here's the results I get...

Before network hang
===================

print_PIC()
printing PIC contents
print_IO_APIC()
testing the IO APIC.......................

.................................... done.
print_all_local_APICs()

... APIC ID:      01000000 (1)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000


... APIC ID:      00000000 (0)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000010000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000001000

NOTICE: results differ every time I hit ALT-SYSRQ-A.
	The '1' bit at 'row 11, col. 26' stays '1'
	no matter how many times I use the magic keys.
	The other '1' bits jump around a bit, or
	disappear alltogether. Also, the sequence
	in which the APICs appear in the dump sometimes
	differs (this example shows 1 first, then 0,
	other times you'd see 0 first, then 1)

After network hang
==================

print_PIC()
printing PIC contents
print_IO_APIC()
testing the IO APIC.......................

.................................... done.
print_all_local_APICs()

... APIC ID:      00000000 (0)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000010000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000


... APIC ID:      01000000 (1)
... APIC VERSION: 00040011
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000001000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000010000000000000000

NOTICE:	hmmm... see, now that '1' bit at row 11,
	col. 26 for APIC 0 which was '1' before
	has turned to '0'. It will stay '0' no
	matter how many times I hit the magic keys...
	It seems to have been replaced by the '1'
	bit at row 11, col. 10, since that bit 
	stays '1' no matter how many magic I
	throw at it...

Hope this helps... If you need more, let me know...

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

Hm, the noapic option seems to help, as I'm currently beating the network to
death but it won't die... As the problem is elusive, it is hard to tell, and it
would not surprise me if the net dropped dead the moment this mail went
through, but current indication is that noapic makes the sudden net-death
disappear.

So.... we're still left with the question 'is this hardware-related, or is it a
software/configuration problem'? Other people seem to have similar problems
with dissimilar hardware (tulip cards instead of Winbond, etc), on 2.2.x as
well as 2.3/4.x. As I do not run Windows (NT or 2K), I can not tell if this
problem also occurs there. And my FreeBSD-box is uniprocessor... So... has
anyone seen anything like this on other 'true' (SMP) OS's? If so, that would
indicate a hardware problem...

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

Another observation wrt. behaviour with 'noapic'...

When streaming time-critical data over the network (running esound to another
server, etc), sometimes there are hiccups in the stream. These hiccups seem to
be much less frequent, if at all present, when running with 'noapic'. I'm
currently running sound over a heavily loaded ethernet, no hiccups at all...
Weird, since the apic ought to spread the load of handling the interrupts over
all available CPU's.

Whatever is causing this, there seems to be something fishy in the way
interrupts are handled when the apic(s) is/are enabled...

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

OK, just one last addition to what has nearly become my own thread...

I now am fairly certain that the problem (network stalls on multiprocessor systems) is not BP6 or NE2K-PCI specific. I found several postings which relate to similar problems on dissimilar hardware. Another interesting one is:

Re: PROBLEM : Networking stops working with kernel 2.4.0-test11 
  (http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg18722.html)

"...I have an almos identical system as you, 2x200MMX motherboard (Gigabyte
       586DX) also Voodoo3 (2000 pci) the same nic Realtek 8029AS, also a bt848
       tv card, also SCSI (Aic-7880 onboard, but not used).

       I have reported it some time ago, and now all I get with
       2.4.0-test11-pre4 and I think a additional patch is  NETDEV WATCHDOG:
       eth0: transmit timed out, and something in the console about lost irq?

       I can't reproduce it with a uniprocesor kernel, and I have a 3c503 card
       wich uses the 8390 module, so I suppose that the problem it's not in the
       8390, and it seems to be smp related...."


ne2k-pci freezes with APIC error on 2.4.0-testX SMP
  (http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg14468.html)

"...

       When doing massive NFS transfers (2.4 machine as the client) on my SMP
       box
       (Abit BP6 2x celeronA 533mhz (non-overclocked) 64Mb ram, latest
       apt-get-ed
       debian woody) my ne2k-pci card (Realtek Semiconductor Co., Ltd.
       RTL-8029(AS)
        (rev 0)) suddenly stops working. test5 spits that in syslog:..."

More to be found when searching the archives. This problem has been around for
a long, long time (probably since the current level of apic-support was added,
somewhere around 2.3.1x?). It has been reported by several people, several
times. I feel like rigging every apic-related piece of code with a zillion
bells and printk's but that would surely only create more mayhem as this whole
thing seems to be timing-related...

Anyone got any idea's on how to tackle this? Anyone who is 'intimate with' the
apic-related code? It'll take me some time to dive into that part, so if there
is anyone who already has taken the plunge, do tell...

Cheers//Frank

[ who is still running apic-less, without problems [
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Jeff Garzik]

Frank de Lange wrote:
> 
> OK, just one last addition to what has nearly become my own thread...
> 
> I now am fairly certain that the problem (network stalls on multiprocessor systems) is not BP6 or NE2K-PCI specific. I found several postings which relate to similar problems on dissimilar hardware. Another interesting one is:

>        I have reported it some time ago, and now all I get with
>        2.4.0-test11-pre4 and I think a additional patch is  NETDEV WATCHDOG:
>        eth0: transmit timed out, and something in the console about lost irq?



Are you judging based on the error message?  The 'netdev watchdog ...'
message is a generic error message that could have any number of
causes.  It's just saying, well, what it says :)  The kernel was unable
to transmit a packet in a certain amount of time.  You might get these
messages if you unplug a cable suddenly, or if your hardware isn't
delivering interrupts, or many other things...

	Jeff


-- 
Jeff Garzik       | "You see, in this world there's two kinds of
Building 1024     |  people, my friend: Those with loaded guns
MandrakeSoft      |  and those who dig. You dig."  --Blondie
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[Frank de Lange]

On Thu, Jan 11, 2001 at 04:47:00PM -0500, Jeff Garzik wrote:
> Are you judging based on the error message?  The 'netdev watchdog ...'
> message is a generic error message that could have any number of
> causes.  It's just saying, well, what it says :)  The kernel was unable
> to transmit a packet in a certain amount of time.  You might get these
> messages if you unplug a cable suddenly, or if your hardware isn't
> delivering interrupts, or many other things...

No, I'm judging based on the fact that I found reports from people using
NE2K-PCI with several cards as well as tulip-based cards (different driver) on
abit BP6 as well as Gigabyte motherboards, mostly on 2.3.x/2.4.x kernels. I
found some postings with these problems on 2.2.x kernels.

Cheers//Frank
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Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware related?

[David Woodhouse]

frank@unternet.org said:
>  No, I'm judging based on the fact that I found reports from people
> using NE2K-PCI with several cards as well as tulip-based cards
> (different driver) on abit BP6 as well as Gigabyte motherboards,
> mostly on 2.3.x/2.4.x kernels. I found some postings with these
> problems on 2.2.x kernels. 

IRQ 19 on my BP6 stopped arriving a few days ago. 

 19:      90373      90473   IO-APIC-level  usb-uhci

Removing and reloading the usb-uhci driver didn't help. Loading the uhci 
driver just oopsed, which seems to be its normal behaviour on the occasions 
on which I try it.

Rebooting fixed it. I was half tempted to code a 'kick APIC because I think 
it broke' function, but then decided not to bother.

It might be nice in 2.5 to give drivers some way of kicking the APIC when 
they think they've missed an interrupt, much like the network code kicks 
the driver. And to deal more gracefully with IRQ storms.

Once a driver has a way of saying "Oi! Why isn't IRQ x working?" it would 
be feasible to just disable the damn thing if we receive a million of them 
in rapid succession.

--
dwmw2


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