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SubjectRe: 2.6.10: kswapd spins like crazy
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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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