Messages in this thread | | | Subject | Re: [CFT] faster athlon/duron memory copy implementation | From | Marcus Libäck <> | Date | 24 Oct 2002 21:11:05 +0200 |
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On Thu, 2002-10-24 at 19:15, Manfred Spraul wrote: > AMD recommends to perform memory copies with backward read operations > instead of prefetch. > > http://208.15.46.63/events/gdc2002.htm > > Attached is a test app that compares several memory copy implementations. > Could you run it and report the results to me, together with cpu, > chipset and memory type? > > Please run 2 or 3 times. > > -- > Manfred > ---- >
[phuse@buffy:~/files]$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 6 model name : AMD Athlon(tm) XP 1900+ stepping : 2 cpu MHz : 1601.986 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow bogomips : 3198.15
[phuse@buffy:~/files]$ gcc athlon.c -o athlon-mem ; ./athlon-mem ; ../athlon-mem ; ./athlon-mem Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
copy_page() tests copy_page function 'warm up run' took 21174 cycles per page copy_page function '2.4 non MMX' took 23369 cycles per page copy_page function '2.4 MMX fallback' took 23134 cycles per page copy_page function '2.4 MMX version' took 20586 cycles per page copy_page function 'faster_copy' took 12297 cycles per page copy_page function 'even_faster' took 11697 cycles per page copy_page function 'no_prefetch' took 8664 cycles per page Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
copy_page() tests copy_page function 'warm up run' took 20611 cycles per page copy_page function '2.4 non MMX' took 23508 cycles per page copy_page function '2.4 MMX fallback' took 23396 cycles per page copy_page function '2.4 MMX version' took 20350 cycles per page copy_page function 'faster_copy' took 12199 cycles per page copy_page function 'even_faster' took 11443 cycles per page copy_page function 'no_prefetch' took 8739 cycles per page Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
copy_page() tests copy_page function 'warm up run' took 20362 cycles per page copy_page function '2.4 non MMX' took 24304 cycles per page copy_page function '2.4 MMX fallback' took 23258 cycles per page copy_page function '2.4 MMX version' took 20307 cycles per page copy_page function 'faster_copy' took 11379 cycles per page copy_page function 'even_faster' took 11388 cycles per page copy_page function 'no_prefetch' took 8800 cycles per page
-- Regards / Med vänlig hälsning: Marcus Libäck <marcus@fofso.net> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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