[Dovecot] hunting timeouts

[Timo Sirainen]

On Thu, 2010-08-12 at 14:28 +0200, Iv Ray wrote:
> The timeout we face is that sometimes even small messages take 20-40 seconds to open (i. e. Tunderbird 2 on Windows 7).
> Or connection to the mail server timeouts.
> 
> Could you give me a few tips where can I look in order to detect the possible reason for these timeouts.

Have you looked at if during the 20-40 seconds the disk I/O is high? If
the problem is on server and not on network, it might be helpful to
strace the process that's taking a long time to reply. Then it could
show if it's mainly waiting for some system call to finish.
http://wiki.dovecot.org/Debugging/ProcessTracing