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SubjectRe: Locking comment on shrink_caches()
On Wed, 26 Sep 2001, Alan Cox wrote:

>and for completeness
>
>VIA Cyrix CIII (original generation 0.18u)
>
>nothing: 28 cycles
>locked add: 29 cycles
>cpuid: 72 cycles
>
>Pentium Pro
>
>nothing: 33 cycles
>locked add: 51 cycles
>cpuid: 98 cycles
>
>(base comparison - pure in order machine)
>
>IDT winchip
>
>nothing: 17 cycles
>locked add: 20 cycles
>cpuid: 33 cycles

2x Pentium MMX 233MHz

nothing: 14 cycles
locked add: 59 cycles
cpuid: 31 cycles

2x Pentium 133MHz

nothing: 14 cycles
locked add: 76 cycles
cpuid: 31 cycles

cpuid is oddly fast.

--
George Greer, greerga@m-l.org | Genius may have its limitations, but stupidity
http://www.m-l.org/~greerga/ | is not thus handicapped. -- Elbert Hubbard

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