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    SubjectRe: [CFT] faster athlon/duron memory copy implementation
    Date
    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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    From: Matthias Welk office: +49-30-3463-7272
    FhG-FOKUS mobile: +49-179- 1144752
    Kaiserin-Augusta-Allee 31 fax : +49-30-3463-8672
    10589 Berlin email : matthias.welk@fokus.fraunhofer.de
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