On Wed, Feb 14, 2007 at 06:17:36PM -0200, Marcelo Tosatti wrote: > On Wed, Feb 14, 2007 at 02:55:46PM -0500, Dave Jones wrote: > > On Wed, Feb 14, 2007 at 05:08:39PM -0200, Marcelo Tosatti wrote: > > > > > > movntq instruction is supported by Geode CPU's, so use > > > fast_clear_page/fast_copy_page versions that have it. > > > > it's supported, but is it a win ? > > The same was also true of the VIA C3/C7's, but due to > > poor memory bandwidth, it turned out to be slower in most cases. > > Do you have the numbers for VIA C3/C7 around?
I don't, and my 3dnow capable C3s are unplugged right now. The newer generation (including the C7) have SSE/SSE2 instead, which seems to be faster. (Using a different benchmark app that uses SSE) clear_page function 'normal clear_page()' took 9425 cycles per page (620.3 MB/s) clear_page function 'new clear_page() ' took 3840 cycles per page (1522.7 MB/s) copy_page function 'normal copy_page()' took 11453 cycles per page (510.5 MB/s) copy_page function 'new copy_page() ' took 5024 cycles per page (1163.7 MB/s) Dave -- http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/