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    SubjectFile System Performance
    Date
    My System:
    Pentium III 800MHz
    128M SDRAM
    Aug 2001 MSC Linux
    XFS File System

    My Results:
    hdparm /dev/hda

    /dev/hda:
    multcount = 0 (off)
    I/O support = 0 (default 16-bit)
    unmaskirq = 0 (off)
    using_dma = 1 (on)
    keepsettings = 0 (off)
    nowerr = 0 (off)
    readonly = 0 (off)
    readahead = 8 (on)
    geometry = 3739/255/63, sectors = 60074784, start = 0

    hdparm -t /dev/hda

    /dev/hda:
    Timing buffered disk reads: 64 MB in 2.71 seconds = 23.62 MB/sec

    time cp -r /usr/src/linux-2.4.6 tst

    real 0m47.376s
    user 0m0.180s
    sys 0m2.710s

    du -bs tst
    144187392 tst

    Actual Performance
    2*144MB/48s=6MB/sec

    Notes:
    1) for consistent results; data size should exceed file cache.
    2) cp reads and writes files: so 2*3MB/sec = 6MB/sec fileio on a 24MB/sec
    drive

    My Questions:
    Is there a way of identifying what the file system is doing here?
    Is there a way to improve it?
    What tools are there to identify and time the raw disk io done by the file
    system?





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