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? The Geode benefits from movntq instead of movq: [EMAIL PROTECTED] ~]$ cat /proc/cpuinfo processor : 0 vendor_id : Geode by NSC cpu family : 5 model : 5 model name : Geode(TM) Integrated Processor by National Semi stepping : 2 cpu MHz : 364.898 cache size : 32 KB ... [EMAIL PROTECTED] ~]$ wget http://www.fenrus.demon.nl/athlon.c ... [EMAIL PROTECTED] ~]$ ./athlon Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $ clear_page() tests clear_page function 'warm up run' took 9565 cycles per page clear_page function '2.4 non MMX' took 3347 cycles per page clear_page function '2.4 MMX fallback' took 3389 cycles per page clear_page function '2.4 MMX version' took 2920 cycles per page clear_page function 'faster_clear_page' took 2912 cycles per page clear_page function 'even_faster_clear' took 2863 cycles per page copy_page() tests copy_page function 'warm up run' took 9409 cycles per page copy_page function '2.4 non MMX' took 13161 cycles per page copy_page function '2.4 MMX fallback' took 13033 cycles per page copy_page function '2.4 MMX version' took 9288 cycles per page copy_page function 'faster_copy' took 9806 cycles per page copy_page function 'even_faster' took 8990 cycles per page - 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/
