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    SubjectRe: Poor desktop responsiveness with background I/O-operations
    On Sun, 20 Sep 2009 05:08:43 +0200
    Ulrich Lukas <stellplatz-nr.13a@datenparkplatz.de> wrote:
    >
    > Observation:
    > - The system becomes _really_ slow as described above; unusable for
    > any multimedia tasks.
    >
    > - Using an encrypted (dm-crypt/LUKS) /home (e.g. on mobile computers)
    > compounds the issue to a painful extent.
    >
    >
    >
    > Possible culprits (I'm guessing) are the Linux I/O- or CPU scheduler.

    this has nothing to do with the cpu scheduler....
    can you try the following two things?

    echo 4096 > /sys/block/sda/queue/nr_requests
    for i in `pidof kjournald` ; do ionice -c1 -p $i ; done

    to see if they help?

    they tweak the IO scheduler... I assume you're using CFQ.


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