Ubuntu 12.04 3.2 Kernel showing incorrect "cache size" in cpuinfo?

Posted by Tom G on Server Fault See other posts from Server Fault or by Tom G
Published on 2012-09-28T21:31:15Z Indexed on 2012/09/28 21:39 UTC
Read the original article Hit count: 235

Filed under:

linux

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ubuntu

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cache

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cpu

2x Xeon E5620 . 16 Cores altogether. /proc/cpuinfo shows cache is only @ 4096kb

According to intel this should have 12MB of "smart cache". Doing searched for E5620 and CPUinfo shows the correct number:

cache size : 12288 KB

However mine shows this:

processor       : 15
v    endor_id       : GenuineIntel
cpu family      : 6
model           : 44
model name      : Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz
stepping        : 2
microcode       : 0x1
cpu MHz         : 2400.104
cache size      : 4096 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx         
bogomips        : 4800.20
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual

Any idea on why it shows like it's missing 8MB in CPU cache?

.

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