Re: [PATCH] zerocopy NFS for 2.5.36

[Andrew Morton]

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.
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.