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    SubjectRe: DMA for ide-scsi?
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    On Saturday 13 of September 2003 13:01, Mikael Pettersson wrote:
    > On Sat, 13 Sep 2003 08:29:18 +0200, Jens Axboe <axboe@suse.de> wrote:
    > >> Actually with 2.6, you no longer need ide-scsi. You'll need to upgrade
    > >> your cdrecord tools and probably your burning GUI, if you use one. I've
    > >> been burning that way for several months now. (I'm using xcdroast,
    > >> though I need to start it with "-n" since I'm using cdrecord 2.01a18.)
    > >> This actually works better for me than ide-scsi as for some reason it
    > >> uses less CPU.
    > >
    > >That's because it _is_ faster. It contains no silly memory allocations
    > >for the buffer and data copying in the kernel, the data is mapped from
    > >the user buffer and DMA'ed directly from there. It also uses DMA where
    > >ide-scsi wont.
    >
    > That begs the question: why won't ide-scsi do DMA?
    > I understand you'd rather see it disappear (:->) but since I use
    > it for other ATAPI devices as well, I'd like to see it maintained
    > and fully operational. Having DMA in ide-scsi would be nice.

    ide-scsi maintainer position is available :-).

    > (And the concept of using a SCSI API to ATA devices is in itself
    > not broken, even if the implementation has some problems.)

    It is not broken short-term, however it is broken long-term.

    > /Mikael

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