Cached file read performance

[Alexander Leidinger]

Quoting Bruce Evans <bde at zeta.org.au> (Fri, 22 Dec 2006 23:37:53 +1100 (EST)):

> On Fri, 22 Dec 2006, Adrian Chadd wrote:
> 
> > On 22/12/06, David Xu <davidxu at freebsd.org> 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.  
> 
> Sure.  It's a larger win mainly in benchmarks.  It's a twisty MD maze.

I want to point out http://www.freebsd.org/projects/ideas/#p-memcpy
here. Just in case someone wants to play around a little bit.

Bye,
Alexander.

-- 
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