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    SubjectRe: 2.6.10: kswapd spins like crazy
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    Date
    On Thu, 2005-02-03 at 11:29 +0100, Terje Fåberg wrote:
    > I recently upgraded my desktop from 2.4.28 to
    > 2.6.10. Even under moderate memory pressure kswapd
    > regularly eats almost all available cpu time
    > whenever there is a little more IO throughput,
    > like copying large files. The system is extremely
    > sluggish during this. The system load goes up to
    > 7.5 or more.
    >
    > This is a Pentium3-866 with 768MB RAM, 2x1GB
    > swap partitions, vanilla 2.6.10. The strange
    > behaviour starts at about 200 MB of swap in use.
    > 2.4.28 masters the same workload without any
    > problems.
    >
    > vmstat:
    > procs -----------memory----------
    > r b swpd free buff cache
    > 6 1 428012 4868 33236 347184
    > ---swap-- -----io---- --system-- ----cpu----
    > si so bi bo in cs us sy id wa
    > 10 7 147 120 108 111 19 10 68 3
    >
    > Is there anything I can do to track this down?
    >

    Can you post about 10 seconds of `vmstat 1` output
    while this is happening?

    Also:
    `cat /proc/vmstat > pre ; sleep 10 ; cat /proc/vmstat > post`
    while this is happening, and send the pre and post files.

    cat /proc/meminfo also might be helpful.

    And compile a kernel with "magic sysrq" support, and get a
    couple of Alt+SysRq+M dumps (the output will be in dmesg).

    Thanks,
    Nick



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