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    SubjectRe: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling
    On Thu, Jan 20, 2005 at 10:42:24AM -0500, Paul Davis wrote:
    > over on #ardour last week, we saw appalling performance from
    > reiserfs. a 120GB filesystem with 11GB of space failed to be able to
    > deliver enough read/write speed to keep up with a 16 track
    > session. When the filesystem was cleared to provide 36GB of space,
    > things improved. The actual recording takes place using writes of
    > 256kB, and no more than a few hundred MB was being written during the
    > failed tests.

    It's been a long while since I followed ReiserFS development closely,
    *however*, this issue used to be a common problem ReiserFS - when
    free space starts to drop below 10%, performace takes a big hit. So
    performance improved when space was cleared up.

    I don't remember what causes this or what the status is in modern
    ResierFS systems.

    > everything i read about reiser suggests it is unsuitable for audio
    > work: it is optimized around the common case of filesystems with many
    > small files. the filesystems where we record audio is typically filled
    > with a relatively small number of very, very large files.

    Anecdotally, I've found this to not be the case. I only use ReiserFS
    and have a few reasonably sized projects in Ardour that work fine:
    maybe 20 tracks, with 10-15 plugins (in the whole project), and I can
    do overdubs with no problems. It may be relevant that I only have a
    four track card and so load is too small.

    But at least in my practice, it hasn't been a huge hinderance.

    --
    Ross Vandegrift
    ross@lug.udel.edu

    "The good Christian should beware of mathematicians, and all those who
    make empty prophecies. The danger already exists that the mathematicians
    have made a covenant with the devil to darken the spirit and to confine
    man in the bonds of Hell."
    --St. Augustine, De Genesi ad Litteram, Book II, xviii, 37
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