RE: AMD optimizations?
Jones D (djones2@glam.ac.uk)
Thu, 26 Aug 1999 12:58:38 +0100
> > I believe I read in Alan's diary that he's written a 3dnow! version
> > of the memory copy routines. As long as it doesn't use
> Athlon specific
> > opcodes then that should speed things along on a K6-2 or K6-3 too.
>
> From benchmarking it on my K6-II its the same speed from main
> memory as using rep mov Intel style. It may be a little faster on
> cached memory. On the K6-III it may be a win but you would want to
> change the prefetch factor a bit.
>
> Start with and see how well it compares to kernel memcpy
> performance (which
> is rep movs)
<Snip>
This reminded of something I meant to ask about the optimised string
copying routines that used to be in the kernel. Is there anyone
working on rewriting those ? I understand they were removed as they
were unstable, and causing problems, but if a stable version can be
produced, the gains should be obvious.
regards,
Dave.
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