Bug 212978 - Incorrect number of CPUs for Pentium D960
Summary: Incorrect number of CPUs for Pentium D960
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel   
(Show other bugs)
Version: 6
Hardware: i686
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2006-10-30 13:57 UTC by J
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2006-10-30 23:09:34 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description J 2006-10-30 13:57:04 UTC
Description of problem:

Only 1 CPU is listed under /proc/cpuinfo for a dual-core CPU (Pentium D960)
Note: This appears to be unrelated to anaconda bug because of the version of the
kernel in use...

Version-Release number of selected component (if applicable):

Linux 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16 14:37:32 EDT 2006 i686
i686 i386 GNU/Linux
Actual results:
> cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 3.60GHz
stepping        : 4
cpu MHz         : 2400.000
cache size      : 2048 KB
physical id     : 0
siblings        : 1
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     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat 
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pni 
monitor ds_cpl vmx est cid cx16 xtpr lahf_lm
bogomips        : 7199.22

Expected results:

( At least ):
cpu cores       : 2

Steps attempted to resolve:
Removed and reinstalled i686 kernel.
( Thinking it was an anaconda bug. )

Other knowns:
Pentium D950 (same motherboard, Intel D965WH, installed as 64 bit returns two
core processors (and I think, 2 siblings)

Comment 1 J 2006-10-30 16:42:48 UTC
It ocurred to me that I should also add this:
Per Intel, I am booting the board with the flags: ALL-GENERIC-IDE PCI=NOMMCONF
Since I have no idea what the second one does, I figured I'd mention it.

Comment 2 J 2006-10-30 23:09:34 UTC
The BIOS has a setting to force the processor into single processor mode. 
Unfortunately, it's wording is a little confusing: "Enable single processor
mode" "disabled" is the setting to get dual processing power from it.

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