linux-kernel - Re: Wrong cache size reported on Q6600

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Date:	Thu, 28 Jun 2007 16:33:13 -0700
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: Wrong cache size reported on Q6600

On Fri, Jun 29, 2007 at 09:31:44AM +1000, Con Kolivas wrote:
> This is a Q6600 which has cache size of 8 MB. Unless it's reporting each 
> half's effective L2, I think it should be reporting 8192 instead of 4096.

There are two L2's, each of 4MB. Each L2 shared by two cores.

thanks,
suresh

> 
> On 2.6.22-rc6:
> 
> cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Quad CPU           @ 2.40GHz
> stepping        : 7
> cpu MHz         : 2401.919
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 4
> core id         : 0
> cpu cores       : 4
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 10
> 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 syscall lm 
> constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4806.38
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Quad CPU           @ 2.40GHz
> stepping        : 7
> cpu MHz         : 2401.919
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 4
> core id         : 1
> cpu cores       : 4
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 10
> 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 syscall lm 
> constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4803.73
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> processor       : 2
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Quad CPU           @ 2.40GHz
> stepping        : 7
> cpu MHz         : 2401.919
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 4
> core id         : 2
> cpu cores       : 4
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 10
> 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 syscall lm 
> constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4803.86
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> processor       : 3
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 15
> model name      : Intel(R) Core(TM)2 Quad CPU           @ 2.40GHz
> stepping        : 7
> cpu MHz         : 2401.919
> cache size      : 4096 KB
> physical id     : 0
> siblings        : 4
> core id         : 3
> cpu cores       : 4
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 10
> 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 syscall lm 
> constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
> bogomips        : 4803.93
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 36 bits physical, 48 bits virtual
> power management:
> 
> -- 
> -ck
> -
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