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    Subjectiosched: time to copy many small files

    This test simply measures how long it takes to copy a large number of files
    within the same filesystem. It creates a lot of small, competing read and
    write I/O's. Changes which were made to the VFS dirty memory handling early
    in the 2.5 cycle tends to make 2.5 a bit slower at this.

    Three copies of the 2.4.19 kernel tree were placed on an ext2 filesystem.
    Measure the time it takes to copy them all to the same filesystem, and to
    then sync the system. This is just

    cp -a ./dir-with-three-kernel-trees/ ./new-dir

    The anticipatory scheduler doesn't help here. It could, but we haven't got
    there yet, and it may need VFS help.

    2.4.21-pre4: 70 seconds
    2.5.61+hacks: 72 seconds
    2.5.61+CFQ: 69 seconds
    2.5.61+AS: 66 seconds

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      Last update: 2005-03-22 13:33    [W:0.025 / U:4.644 seconds]
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