[Dovecot] Ongoing performance issues with 2.0.x
Ralf.Hildebrandt at charite.de
Sat Nov 6 17:32:08 EET 2010
* Stan Hoeppner <stan at hardwarefreak.com>:
> Hmm. My Lenny systems have 4.3.2-2. Are you maybe using Squeeze, not
Yes, squeeze, sorry
> I'm still using i686 systems, but I wouldn't think that would change
> the version of GCC that gets installed. I'm not sure if this may be
> playing a role in this problem or not. What kernel version are you
> running, stock Debian or rolled from source?
2.6.32-23-generic-pae, from Ubuntu
> I'm trying to help you identify what is different on your system from
> other OPs that is causing 2.x to perform so badly vs 1.x. If sys is
> high but usr and iowait aren't, then I would think the problem is in a
> system library, your kernel, dovecot, or more specifically, the
> interaction among all three.
> You're using maildir correct? What filesystem are you using?
Maildir on ext4
> Are you doing anything in your Dovecot config, both 1.x and 2.x, that is
> "unique" or non-standards maybe, compared to other OPs?
It's all users from /etc/passwd, but nothing special.
> Is this a virtual machine guest or bare metal host?
virtual machine guest
> What do memory and swap usage look like?
Memory usage is identical with 2.0 and 1.2:
The machine has no swap.
> What do you see for %CPU when you watch your kernel threads in top? Is
> one of then eating lots of CPU time? If so, which one?
Uhm, for that I'd have to switch back and look at kernel threads
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