Messages in this thread | | | Subject | Re: [PATCH] zerocopy NFS for 2.5.36 | From | Alan Cox <> | Date | 19 Sep 2002 11:42:43 +0100 |
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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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