Messages in this thread | | | Date | Thu, 15 Feb 2007 13:01:16 -0200 | From | Marcelo Tosatti <> | Subject | Re: [PATCH] use movntq version of fast_clear_page/fast_copy_page on Geode |
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On Wed, Feb 14, 2007 at 09:16:46PM +0000, Alan wrote: > On Wed, 14 Feb 2007 17:08:39 -0200 > Marcelo Tosatti <marcelo@kvack.org> wrote: > > > > > movntq instruction is supported by Geode CPU's, so use > > fast_clear_page/fast_copy_page versions that have it. > > Is it actually faster for macro performance not just microbenchmarking ?
A COW intensive private mmap() benchmark shows the kernel spending _more_ time inside mmx_copy_page() with movntq than with movq.
So its not clear whether the patch is actually a win, please drop it.
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