LinuxQuestions.org - /proc/cpuinfo does not show the correct information

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/proc/cpuinfo does not show the correct information

Hi,

I'm running 2 dual quad core Xeon 5506 systems - identical specs and identical problems.

I am currently running 2.6.18-194.26.1.el5xen though I have also tried running a non-Xen kernel and a later Xen kernel.

Here is the output of cat /proc/cpuinfo:

Quote:

[root@KSP-R2-COL2 cpu1]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Genuine Intel(R) CPU @ 0000 @ 2.13GHz
stepping : 2
cpu MHz : 2133.408
cache size : 4096 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc pni vmx est ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips : 5335.60
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 26
model name : Genuine Intel(R) CPU @ 0000 @ 2.13GHz
stepping : 2
cpu MHz : 2133.408
cache size : 4096 KB
physical id : 1
siblings : 1
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu tsc msr pae cx8 apic mtrr cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc pni vmx est ssse3 cx16 sse4_1 sse4_2 popcnt lahf_lm
bogomips : 5335.60
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:

Clearly there are 2 problems here:
1) It is only showing 2 cores on an octal core machine,
2) The CPU model number is "CPU @ 0000" and not "Xeon 5506 @ 2.13GHz"

Motherboard is Supermicro X8DTT-IBXF.

Xen DomUs can see 8 cores but still see @ 0000.

I don't think this is faulty hardware since both of these nodes were working fine before we did a CentOS reinstall.

Any ideas why only 2 cores with the wrong info are being shown?

/proc/cpuinfo isn't that reliable actually .. can you see 8 cpu's in top ? ( press '1' when interactive )

Hi theburningcat,

I am facing the same problem that you have posted here where the cpuinfo file isnt showing the correct information. If you have found a reason could you kindly share it please.. I have tried kbp's suggestion and it does show the expected number of cpus but I am currently working on finding out why cpuinfo is not providing correct info...

Appreciate any help, Thanks for your time....

Regards,

A BIOS reset got it to show all the cores but apart from that I contact Supermicro who wanted me to send the kit in for them to test. I couldn't afford to remove these servers from their live environment so I settled with cpuinfo showing the wrong information.

Thank you for the prompt response. Yes, in my case too, i was able to get it to show the right number of cores but the info provided in the cpuinfo file is very misleading.. Mine is a dual quad-core IBM machine, so it shows 8 processors but the problem all the 8 processors have the same core id (255- dunno why this random no), same no-of-cores(1- which is wrong, should be 4) but different physical id for all the 8 processors which would imply there are 8 physical processors which again is not true.. so that's my problem.. I need to atleast figure out the reason behind such inconsistent naming .. Kindly let me know if you come across any reason for this...

Anyway, thanks for your help!!!