2002-11-21 13:18:35

by Margit Schubert-While

Subject: L1_CACHE_SHIFT value for P4 ?

Andi,
L2 cache lines = L2 cache size ?
This P4 has got 512KB L2 cache.

processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 2.40GHz
stepping : 4
cpu MHz : 2400.143
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
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
bogomips : 4784.12

2002-11-21 13:25:01

by Dave Jones

Subject: Re: L1_CACHE_SHIFT value for P4 ?

On Thu, Nov 21, 2002 at 02:25:54PM +0100, Margit Schubert-While wrote:
> Andi,
> L2 cache lines = L2 cache size ?

No.

> This P4 has got 512KB L2 cache.

That 512KB is divided into 'lines' of n bytes.
Where n is the L1_CACHE_SHIFT value. (Or should be).
x86info will tell you the line size. (Its also printk'd at boot up iirc)

Dave

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| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs