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Date: Wed, 10 Oct 2001 10:09:31 +0200
From: VDA <VDA@port.imtp.ilyichevsk.odessa.ua>
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To: Dan Maas <dmaas@dcine.com>, Bryan Mayland <bmayland@leoninedev.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] again: Re: Athlon kernel crash (i686 works)
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>> I've run several LMbench tests against both 686-optimized
>> and Athlon-optimized kernels.  The results waver across multiple
>> tests, one kernel winning some tests one time and losing the next,
>> but the values are all close.

DM> The benefits of the kernel Athlon optimizations are higher memory bandwidth
DM> for bulk copies/clears and less cache pollution. But LMbench isn't going to
DM> show any difference, because its tests use generic x86 mem*() functions, not
DM> Athlon-optimized SSE memory routines like in the Athlon kernel.

There are no SSE optimizations (yet).
There are prefetch/movntq tricks.
Optimized fast_clear_page() is 3x faster than normal one,
optimized fast_copy_page() is 1.5x faster than normal one.
(roughly, it depends on your mem and CPU MHz)

I can mail a test program to you if you are curious.
-- 
Best regards, VDA
mailto:VDA@port.imtp.ilyichevsk.odessa.ua


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