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SubjectRe: [CFT] faster athlon/duron memory copy implementation
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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>
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