Re: [PATCH] zerocopy NFS for 2.5.36

From: Alan Cox (
Date: Thu Sep 19 2002 - 05:42:43 EST

On Thu, 2002-09-19 at 04:30, Andrew Morton wrote:
> > It's disappointing that this program doesn't seem to support
> > benchmarking of MMX copy loops (like the ones in arch/i386/lib/mmx.c).
> > Those seem to be the more interesting memcpy functions on modern
> > systems.
> Well the source is there, and the licensing terms are most reasonable.
> But then, the source was there eighteen months ago and nothing happened.
> Sigh.
> I think in-kernel MMX has fatal drawbacks anyway. Not sure what
> they are - I prefer to pretend that x86 CPUs execute raw C.

MMX isnt useful for anything smaller than about 512bytes-1K. Its not
useful in interrupt handlers. The list goes on.

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