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