[Dovecot] Ongoing performance issues with 2.0.x

Robert Schetterer robert at schetterer.org
Fri Nov 5 15:33:57 EET 2010

Am 05.11.2010 10:58, schrieb Ralf Hildebrandt:
> * Ralf Hildebrandt <Ralf.Hildebrandt at charite.de>:
>> Due to the ongoing performance issues with 2.0.x I switched back to
>> 1.2.15 yesterday evening, with no changes to the machine or my users.
>> (I migrated from 1.2.15 to 2.0.x by converting the existing config)
>> Today, we have MUCH LESS load, with the same number of logins/min.
>> I cannot say what exactly causes this immense increase in load, but one
>> observation is that the time spent in system() has now dropped (user and
>> iowait have stayed contant) to a third of the values I was seeing with
>> 2.0.x.
>> This evening I'll post some graphs showing two comparable 24  hour
>> ranges.
> I uploaded a preliminary screenshot with comments:
> http://www.arschkrebs.de/bugs/dovecot.png
> During the night we're using clamdscan to scan mailboxes for viruses,
> this results in the big block of system & user from 0:00 until about
> 08:00

Hi Ralph, high cpu load is common with clamscan

Best Regards

MfG Robert Schetterer


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