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    SubjectRe: -rt doesn't compile for UML
    > > When writing a big file to a ubd disk, everything in uml slows down to
    > > a crawl, even though CPU usage is minimal.
    > What exactly is your test case?

    Something like:

    dd if=/host/tmp/bigfile of=/tmp/bigfile bs=1048576 count=100

    and run 'top' or 'watch something' in another terminal, which
    sometimes completely stops updating during the write.

    > I have some patches which theoretically should help I/O performance
    > which I've been sitting on because I can't find a case where they
    > help.

    It's not I/O performance I'm worried about, but scheduling latencies.
    CPU use inside and outside the UML is minimal, so I can't see where
    this slowdown comes from.

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      Last update: 2007-11-28 16:37    [W:0.018 / U:0.316 seconds]
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