Messages in this thread |  | | Date | Wed, 10 Oct 2001 10:09:31 +0200 | From | VDA <> | 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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