Re: [PATCH] zerocopy NFS for 2.5.36

From: Andrew Morton (
Date: Wed Sep 18 2002 - 22:30:52 EST

Aaron Lehmann wrote:
> > akpm:/usr/src/cptimer> ./cptimer -d -s
> > nbytes=10240 from_align=0, to_align=0
> > copy_32: copied 19.1 Mbytes in 0.078 seconds at 243.9 Mbytes/sec
> > __copy_duff: copied 19.1 Mbytes in 0.090 seconds at 211.1 Mbytes/sec
> 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.

I think in-kernel MMX has fatal drawbacks anyway. Not sure what
they are - I prefer to pretend that x86 CPUs execute raw C.
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