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    SubjectRe: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling
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    Paul Davis <paul@linuxaudiosystems.com> writes:

    >>That's discouraging about reiserfs. Is it version 3 or 4? Earlier
    >>versions showed good realtime responsiveness for audio testers. It
    >>had a reputation for working much better at lower latency than ext3.
    >
    > 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.
    >
    > 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.

    I was not speaking of its disk performance, but rather of low-latency
    CPU performance. In 2.4 with the low-latency patches, reiserfs did
    that fairly well.

    I know its design is not focused on streaming large blocks of data to
    disk. But, when you're recording clicks every 20 seconds, disk
    throughput is definitely a secondary consideration.

    Looks like we need to do another study to determine which filesystem
    works best for multi-track audio recording and playback. XFS looks
    promising, but only if they get the latency right. Any experience
    with that?
    --
    joq
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