Trying to figure out hardware info for Linux box

ScoreOne · 10-20-2010, 01:42 PM

Hi,

I'm trying to figure out the number of physical processors and cores for this box. I thought this is a quadcore and when I used the 'cat /proc/cpuinfo' command I got proc0 and proc1.. see below. Anyone happen to know what's causing this?

Thanks

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Intel(R) Xeon(R) CPU L5420 @ 2.50GHz
stepping : 6
cpu MHz : 2501.085
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
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 lm pni monitor ds_cpl est tm2 xtpr
bogomips : 5003.60

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 7
model name : Intel(R) Xeon(R) CPU L5420 @ 2.50GHz
stepping : 6
cpu MHz : 2501.085
cache size : 6144 KB
physical id : 1
siblings : 4
core id : 4
cpu cores : 4
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
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 lm pni monitor ds_cpl est tm2 xtpr
bogomips : 4999.60

SaintDanBert · 10-20-2010, 02:00 PM

I don't know anything about your specific processor, but would check the identifiers at the Intel(tm) site.

I would also check you "system setup" or CMOS or BIOS settings to see if you must enable or disable something.

The utility lshw shows a linux-eye view of your hardware.

Code:

...
    *-cpu:0
          description: CPU
          product: Intel(R) Core(TM)2 Duo CPU     L7500  @ 1.60GHz
          vendor: Intel Corp.
          physical id: 6
          bus info: cpu@0
          version: 6.15.11
          serial: 0000-06FB-0000-0000-0000-0000
          slot: None
          size: 1200MHz
          capacity: 1200MHz
          width: 64 bits
          clock: 200MHz
          capabilities: boot fpu fpu_exception wp 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 nx x86-64 constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority cpufreq
          configuration: id=0
...

The utility dmidecode has a report about processor details.
Read the man-page for an explanation of that tool. My report says,
in part:

Code:

...
Handle 0x0006, DMI type 4, 35 bytes
Processor Information
        Socket Designation: None
        Type: Central Processor
        Family: Other
        Manufacturer: GenuineIntel
        ID: FB 06 00 00 FF FB EB BF
        Version: Intel(R) Core(TM)2 Duo CPU     L7500  @ 1.60GHz
        Voltage: 1.1 V
        External Clock: 200 MHz
        Max Speed: 1600 MHz
        Current Speed: 1600 MHz
        Status: Populated, Enabled
        Upgrade: None
        L1 Cache Handle: 0x000A
        L2 Cache Handle: 0x000C
        L3 Cache Handle: Not Provided
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified
...

Bonne chance,
~~~ 0;-Dan

ScoreOne · 10-20-2010, 02:23 PM

Thanks for the response. I will look into those commands.
I'm just wondering what are the potential reasons for causing the output to only show two logical processors? This is the first time I'm seeing so this so it would be good to have an idea what may be causing this before I go around tinkering with the settings.

Thanks

SaintDanBert · 10-21-2010, 04:19 PM

I would think that (1) either you only have a dual core item instead of the quad or other that you expected, or (2) BIOS or similar has suppressed the others.

I'm not a maven about either multi-core processors or what the kernel is doing to support them. Perhaps a trip to various kernel and symmetric multi-processing (SMP) sites will shed light.

Wish I could have helped more,
~~~ 0;-Dan

SaintDanBert · 10-21-2010, 04:20 PM

Inspect your kernel config file to see what it says about multiple and multi-core processors. Where it lives depends on your distribution.

~~~ 0;-Dan