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    SubjectRe: APM killing low-latency performance on BX mainboard (we need a method to disable it dynamically)
    On Wed, Nov 10 1999, Benno Senoner wrote:
    > I discovered a small (but easy to correct) problem:
    > by default ATAPI CDROM driver run with DMA , unmaskirq and 32bit I/O
    > all three disabled. You can tune this using
    > hdparm -d 1 -u 1 -c 1 /dev/hdc or so , but the problem is that
    > you can't do this when there is no CD in the drive.

    That's the _old_ O_NONBLOCK bug again. The distros should
    fix hdparm - there's nothing preventing your from changin
    parameters without a disc in the drive.

    * Jens Axboe <>
    * Linux CD-ROM Maintainer

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