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    Subjectbugme #1217: "Use PCI DMA by default when available" does not work
    I sent the following followup report to the bug I filed at several months ago about my hpt372 ide controller being

    I have determined what causes the dramatic slowdown problem. It is not
    drive specific but it may be specific to the hpt controllers. The
    problem is due to using automatic dma. If I don't have the following
    two options set in my kernel then it runs at full speed when I turn on
    dma with hdparm. Otherwise using automatic dma I get somewhere between
    a 50% - 700% slowdown on writes, reads seem to not be as badly affected.
    This is reproducible on both 2.4.23-rc1-xfs and 2.6.0-test9-bk24 (the
    two I tested on).


    Chris Cheney
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