[Dovecot] imap-login crashes after upgrade to Dovecot 1.2.8 Linux 64-bit

[Timo Sirainen]

On Fri, 2009-12-18 at 14:56 +0000, Chris Wakelin wrote:
> > I guess the crash is caused by the "connection queue full". I'll see about fixing the crash, but you shouldn't let it get full in any case. So increase your login_max_connections value.
> > 
> 
> That's puzzling, I thought it was supposed to fire up another imap-login
> process (up to login_max_processes_count)?

It's supposed to, yes, but it's been buggy for a long time and I haven't
figured out how to fix it. v2.0 should finally fix it..

>  We have something in the
> region of 1000 concurrent connections and login_max_processes_count *
> login_max_connections = 128 * 256 should be enough for 32000+ of them!
> 
> Would it be better to have login_max_connections = 1024 (or even higher)?

Yes. If you have only one CPU/core you shouldn't have more than 2 login
processes.

> I'm also confused as to why we never saw the problem on the Solaris box
> (with more connections as it was during term time).

It was probably doing a better job than Linux of distributing
connections to processes.
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