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SubjectRe: Busy-wait delay in qmail 1.03 after upgrading to Linux 2.6
Haakon Riiser <hakonrk@ulrik.uio.no> wrote:
>
> > Seems innocuous. What filesystem type is lock/trigger on?
>
> Reiserfs.
>
> > Can you generate a kernel profile of this activity?
>
> Done. Note that I had to reboot to do the profiling, so the
> delay is not as bad as the first example:
>
> 344 00:19:07.476825 write(5, "\0", 1) = 1 <0.291500>
>
> Still around 700 times slower than 2.4 though. :-) Anyway,
> here are the results:
>
> Output from time:
>
> real 0m0.309s
> user 0m0.011s
> sys 0m0.004s
>
> Data in prof.time:

OK, that's inconclusive. Could you do a few runs, or leave it a day or
two, wait until the problem is really prominent and see if you can gather a
clearer profile? The profiling overhead is negligible when profiling is
enabled but not in use, so there is no need to reboot.


Thanks.
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