Re: [PATCH] [2.4] [2.5] [i386] Add support for GCC 3.1

From: rwhron@earthlink.net
Date: Mon May 27 2002 - 11:55:47 EST

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>> Adding CONFIG_XF86_USE_3DNOW=y
>> seems to help a little too.

Mmm, maybe not.

> Make sure you benchmark FPU intensive use when testing USE_3DNOW. I've
> seen several situations where it looks marginally better until you
> actually measure two things - memory bandwidth available to user
> programs, and also FPU performance, especially of FPU heavy apps that
> schedule a lot (eg Quake)

Thanks for helping me narrow the search. On an allocate and write to
pages of memory test, USE_3DNOW increased test time by 15% (which is
bad) on k6-2.

Both kernels compiled with gcc-3.1.0 -march=k6-2.

mtest01 -w 50 executed 100 times

CONFIG_X86_USE_3DNOW=n 745 seconds
CONFIG_X86_USE_3DNOW=y 860 seconds

-- Randy Hron

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