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    SubjectRe: [PATCH] 2.6 ide-cd DMA ripping
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    Jens Axboe <axboe@suse.de> writes:

    > On Sat, Mar 06 2004, Sean Neakums wrote:
    >> Jens Axboe <axboe@suse.de> writes:
    >>
    >> > Hi,
    >> >
    >> > 2.6 still uses PIO for CDROMREADAUDIO cdda ripping, which is less than
    >> > optimal of course... This patch uses the block layer infrastructure to
    >> > enable zero copy DMA ripping through CDROMREADAUDIO.
    >> >
    >> > I'd appreciate people giving this a test spin. Patch is against
    >> > 2.6.4-rc1 (well current BK, actually).
    >>
    >> Applied successfully to 2.6.4-rc1-mm2, and it works great. For some
    >> reason, on two different machines, ripping with cdparanoia used to
    >> somehow crowd out the serial port, but now everything just works.
    >
    > cd ripping was highly cpu intensive when it ran in pio, so it's very
    > likely that this screwed up your serial port communication. It doesn't
    > matter with the patch, but had you used hdparm -u1 on your cd device
    > on an unpatched kernel, you would have had better luck.

    I had a look, just for pig iron, and hdparm -u on one of the machines
    reports that it is already enabled. That machine is SMP with two
    1.13GHz PIIIs. I can't check the other machine as the drive in
    question is no longer functional.
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