Fw: [Bugme-new] [Bug 5693] New: Hyperthreading processor shows only 1 CPU

Fw: [Bugme-new] [Bug 5693] New: Hyperthreading processor shows only 1 CPU

[Andrew Morton]

Is this an APCI problem?

Begin forwarded message:

Date: Fri, 2 Dec 2005 12:32:33 -0800
From: bugme-daemon@bugzilla.kernel.org
To: bugme-new@lists.osdl.org
Subject: [Bugme-new] [Bug 5693] New: Hyperthreading processor shows only 1 CPU


http://bugzilla.kernel.org/show_bug.cgi?id=5693

           Summary: Hyperthreading processor shows only 1 CPU
    Kernel Version: 2.6.14.3
            Status: NEW
          Severity: normal
             Owner: platform_i386@kernel-bugs.osdl.org
         Submitter: stephen@revealed.net


Most recent kernel where this bug did not occur: 
   (that I'm aware of and have tested) 2.6.10

Distribution: LFS

Hardware Environment: 
  Intel S875WP1-E Entry Server Board
  Intel(R) Pentium(R) 4 CPU 3.40GHz
  1 Gig Ram
  250 Gig sata drive

(Output from lspci)
00:00.0 Host bridge: Intel Corp.: Unknown device 2578 (rev 02)
00:01.0 PCI bridge: Intel Corp.: Unknown device 2579 (rev 02)
00:03.0 PCI bridge: Intel Corp.: Unknown device 257b (rev 02)
00:1d.0 USB Controller: Intel Corp.: Unknown device 24d2 (rev 02)
00:1d.1 USB Controller: Intel Corp.: Unknown device 24d4 (rev 02)
00:1d.2 USB Controller: Intel Corp.: Unknown device 24d7 (rev 02)
00:1d.3 USB Controller: Intel Corp.: Unknown device 24de (rev 02)
00:1d.7 USB Controller: Intel Corp.: Unknown device 24dd (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corp.: Unknown device 24d0 (rev 02)
00:1f.1 IDE interface: Intel Corp.: Unknown device 24db (rev 02)
00:1f.2 IDE interface: Intel Corp.: Unknown device 24d1 (rev 02)
00:1f.3 SMBus: Intel Corp.: Unknown device 24d3 (rev 02)
02:01.0 Ethernet controller: Intel Corp.: Unknown device 1019
03:06.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
03:07.0 RAID bus controller: Promise Technology, Inc.: Unknown device 3319 (rev 02)
03:08.0 Ethernet controller: Intel Corp.: Unknown device 1050 (rev 01)

Software Environment:
  Console based server set up.  Based off of LFS 5.1  Running apache, qmail, mysql.

Problem Description:
  Upgraded to the 2.6.14.3 kernel because of SMP based eip errors on the
previous kernel (2.6.10) when the system was under heavy load.  With SMP and SMT
turned on, and the kernel set for Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon
as the Processor Family.  The 3.4ghz hyperthreading processor only shows 1 CPU
in /proc/cpuinfo, and in the boot.log/dmesg output.

(Output of /proc/cpuinfo)
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 3
model name      : Intel(R) Pentium(R) 4 CPU 3.40GHz
stepping        : 4
cpu MHz         : 3392.200
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe pni monitor ds_cpl cid
xtpr
bogomips        : 6792.41

(dmesg information)
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
 BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000003fe30000 (usable)
 BIOS-e820: 000000003fe30000 - 000000003fe414a0 (ACPI NVS)
 BIOS-e820: 000000003fe414a0 - 000000003ff30000 (usable)
 BIOS-e820: 000000003ff30000 - 000000003ff40000 (ACPI data)
 BIOS-e820: 000000003ff40000 - 000000003fff0000 (ACPI NVS)
 BIOS-e820: 000000003fff0000 - 0000000040000000 (reserved)
 BIOS-e820: 00000000fecf0000 - 00000000fecf1000 (reserved)
 BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
127MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000ff780
On node 0 totalpages: 261936
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 225280 pages, LIFO batch:31
  HighMem zone: 32560 pages, LIFO batch:15
DMI 2.3 present.
Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
OEM ID:  Product ID: Canterwood-P APIC at: 0xFEE00000
Processor #0 15:3 APIC version 20
I/O APIC #2 Version 32 at 0xFEC00000.
Enabling APIC mode:  Flat.  Using 1 I/O APICs
Processors: 1
Allocating PCI resources starting at 50000000 (gap: 40000000:becf0000)
Built 1 zonelists
Kernel command line: root=/dev/sda2
mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 65536 bytes)
Detected 3392.200 MHz processor.
Using tsc for high-res timesource
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1032496k/1047744k available (2816k kernel code, 14400k reserved, 1007k
data, 216k init, 130168k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 6792.41 BogoMIPS (lpj=13584833)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 0000441d
00000000 00000000
CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 0000441d
00000000 00000000
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: After all inits, caps: bfebfbff 00000000 00000000 00000080 0000441d
00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
mtrr: v2.0 (20020519)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... OK.
CPU0: Intel(R) Pentium(R) 4 CPU 3.40GHz stepping 04
Total of 1 processors activated (6792.41 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 pin1=2 pin2=0
Brought up 1 CPUs
<<<Snip>>>


Steps to reproduce:
  I've personally reproduced this issue on two boxes with almost duplicate
hardware setups.  I compiled the kernel with these options in the config for the
CPU:

CONFIG_X86_PC=y
CONFIG_MPENTIUM4=y
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
CONFIG_X86_L1_CACHE_SHIFT=7
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_SMP=y
CONFIG_NR_CPUS=32
CONFIG_SCHED_SMT=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_BKL=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
CONFIG_X86_MCE_P4THERMAL=y

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