Messages in this thread | | | Date | Fri, 25 Oct 2002 04:43:28 +1000 | Subject | Re: [CFT] faster athlon/duron memory copy implementation | From | (Simon Fowler) |
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On Thu, Oct 24, 2002 at 07:15:43PM +0200, 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. > simon@caccini:~/hacking$ cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 1 model name : AMD-K7(tm) Processor stepping : 2 cpu MHz : 553.880 cache size : 512 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 pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat mmx syscall mmxext 3dnowext 3dnow bogomips : 1104.28
simon@caccini:~/hacking$ ./athlon; ./athlon; ./athlon 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 12855 cycles per page copy_page function '2.4 non MMX' took 17267 cycles per page copy_page function '2.4 MMX fallback' took 14930 cycles per page copy_page function '2.4 MMX version' took 10642 cycles per page copy_page function 'faster_copy' took 10591 cycles per page copy_page function 'even_faster' took 13035 cycles per page copy_page function 'no_prefetch' took 11657 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 12871 cycles per page copy_page function '2.4 non MMX' took 18482 cycles per page copy_page function '2.4 MMX fallback' took 15013 cycles per page copy_page function '2.4 MMX version' took 10679 cycles per page copy_page function 'faster_copy' took 12268 cycles per page copy_page function 'even_faster' took 10789 cycles per page copy_page function 'no_prefetch' took 11691 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 13110 cycles per page copy_page function '2.4 non MMX' took 14958 cycles per page copy_page function '2.4 MMX fallback' took 14952 cycles per page copy_page function '2.4 MMX version' took 12864 cycles per page copy_page function 'faster_copy' took 10581 cycles per page copy_page function 'even_faster' took 10629 cycles per page copy_page function 'no_prefetch' took 11607 cycles per page
Simon
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