nforce2 one card per irq only

[Bob <recbo@nishanet.com>]

Why does dmesg and dmesg -s65536 and
CONFIG_LOG_BUF_SHIFT 14 or 16 have
my dmesg and kern.log truncate here?
I can't see Ross' delay patch printk

In case of odd devfs vc tty thing I
tried "console=vc/0 console=tty0"

dmesg begins--

been registered
PnPBIOS: Scanning system for PnP BIOS support...
PnPBIOS: Found PnP BIOS installation structure at 0xc00fc660
PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0xc690, dseg 0xf0000
pnp: match found with the PnP device '00:07' and the driver 'system'
pnp: match found with the PnP device '00:08' and the driver 'system'
PnPBIOS: 13 nodes reported by PnP BIOS; 13 recorded by driver
SCSI subsystem initialized
ACPI: PCI Interrupt Link [APCS] enabled at IRQ 23
IOAPIC[0]: Set PCI routing entry (2-23 -> 0xa9 -> IRQ 23 Mode:1 Active:0)

and if I use smp instead of uniprocessor kernel,
I get a few lines more showing so Ross' numbers
show but PIC timer is on so the numbers are
useless

________________________________________________

MSI K7N2 Delta MCP2-T amd xp3000+ 333mhz fsb 1:1

nforce2, Award bios update stopped crashing

kernel 2.6.0-test11

I need Ross' ioapic patch to get ioapic edge timer
working.

cpu disconnect defaults to on, and on or off makes
no diff except 50% more MIS count, ERR 0 either way,
no crashes.

Once I moved a tulip ethernet 10/100 nic off the
irq of a promise ide controller I got ERR 0 and
much less MIS count.

24 hours uptime

           CPU0       
  0:   84527308    IO-APIC-edge  timer
  1:      37635    IO-APIC-edge  i8042
  2:          0          XT-PIC  cascade
  8:          1    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 12:     532175    IO-APIC-edge  i8042
 14:        106    IO-APIC-edge  ide0
 15:        215    IO-APIC-edge  ide1
 16:     354495   IO-APIC-level  ide2, ide3
 17:          0   IO-APIC-level  yenta, yenta
 19:     151532   IO-APIC-level  ide4, ide5
 20:     309690   IO-APIC-level  eth0
 21:       1579   IO-APIC-level  NVidia nForce2
NMI:          0 
LOC:   84527227 
ERR:          0
MIS:        188

according to athcool, cpu disconnect on

So one irq per slot is still necessary with pci on
this system, and hdparm unmask off did not help.

This is a uniprocessor but the hd controller and
tulip card on one irq would produce a lot of APIC
errors when cp over nfs while bonnie++, and here
is something from Maciej nominally for smp--

/usr/src/linux-2.6.0-test11/arch/i386/kernel/apic.c
        /*
         * Some unknown Intel IO/APIC (or APIC) errata is biting us with
         * certain networking cards. If high frequency interrupts are
         * happening on a particular IOAPIC pin, plus the IOAPIC routing
         * entry is masked/unmasked at a high rate as well then sooner or
         * later IOAPIC line gets 'stuck', no more interrupts are received
         * from the device. If focus CPU is disabled then the hang goes
         * away, oh well :-(
         *
         * [ This bug can be reproduced easily with a level-triggered
         *   PCI Ne2000 networking cards and PII/PIII processors, dual
         *   BX chipset. ]
         */
        /*
         * Actually disabling the focus CPU check just makes the hang less
         * frequent as it makes the interrupt distributon model be more
         * like LRU than MRU (the short-term load is more even across CPUs).
         * See also the comment in end_level_ioapic_irq().  --macro
         */