Cached file read performance

Adrian Chadd adrian at
Thu Dec 21 20:35:34 PST 2006

On 22/12/06, David Xu <davidxu at> wrote:

> I suspect in such a test, memory copying speed will be a key factor,
> I don't have number to back up my idea, but I think Linux has lots
> of tweaks, such as using MMX instruction to copy data.

I had the oppertunity to study the AMD Athlon XP Optimisation guide
and noted their example copy routine, optimised for the chipset, was
quite a hell of a lot faster over a straight block copy.

Has anyone here done any similar modifications to optimise
copyin/copyout? I can't imagine it'd be a bad thing to have.


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