[Dovecot] load increase after upgrade to 2.0.8

Stan Hoeppner stan at hardwarefreak.com
Fri Dec 10 11:12:55 EET 2010

Timo Sirainen put forth on 12/9/2010 7:10 PM:
> On 10.12.2010, at 0.54, Stan Hoeppner wrote:
>> However, this still doesn't seem to explain Ralf's issue, where the
>> kernel stays the same, but the Dovecot version changes, with 2.0.x
>> causing the high load and 1.2.x being normal.  Maybe 2.0.x simply causes
>> this bug to manifest itself more loudly?
> Cor's debugging has so far shown that a single epoll_wait() call can sometimes generate a few thousand voluntary context switches. I can't really understand how that's possible. Those epoll_wait() calls about half of the total voluntary context switches generated by imap processes. We'll see tomorrow if poll() works better or if a small patch I made makes it better.
>> This Linux kernel bug doesn't explain the high load reported with 2.0.x
>> on FreeBSD either.
> Who has reported high load on FreeBSD? So far I know of only Ralf and Cor and both are using Linux.

Oh, my bad Timo.  I thought someone said they were running Dovecot 2.0.x
atop FreeBSD on bare metal and having the high load issue.  I must have
got two different posts crossed up in the gray matter.


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