On Thursday 24 October 2002 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
Running on an Athlon XP2000+, ASUS A7V333, 768MB DDR2100:
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 18132 cycles per page
copy_page function '2.4 non MMX' took 25200 cycles per page
copy_page function '2.4 MMX fallback' took 19369 cycles per page
copy_page function '2.4 MMX version' took 18078 cycles per page
copy_page function 'faster_copy' took 11343 cycles per page
copy_page function 'even_faster' took 11203 cycles per page
copy_page function 'no_prefetch' took 7814 cycles per page
1019 [maw] (buruk) /tmp/athlon # athlon_test
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 18081 cycles per page
copy_page function '2.4 non MMX' took 19487 cycles per page
copy_page function '2.4 MMX fallback' took 19403 cycles per page
copy_page function '2.4 MMX version' took 18086 cycles per page
copy_page function 'faster_copy' took 11372 cycles per page
copy_page function 'even_faster' took 11183 cycles per page
copy_page function 'no_prefetch' took 7815 cycles per page
1020 [maw] (buruk) /tmp/athlon # athlon_test
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 18081 cycles per page
copy_page function '2.4 non MMX' took 19487 cycles per page
copy_page function '2.4 MMX fallback' took 19453 cycles per page
copy_page function '2.4 MMX version' took 18063 cycles per page
copy_page function 'faster_copy' took 11335 cycles per page
copy_page function 'even_faster' took 11154 cycles per page
copy_page function 'no_prefetch' took 8332 cycles per page
Greeting, Matthias.
--
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