Messages in this thread | | | Date | Mon, 27 May 2002 12:55:47 -0400 | Subject | Re: [PATCH] [2.4] [2.5] [i386] Add support for GCC 3.1 | From | rwhron@earthlin ... |
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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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