[Dovecot] Concurrent POP3 Sessions Issues

[Brandon Lamb]

On Fri, Jan 30, 2009 at 4:39 AM, Mauricio López Riffo
<mauricio.lopez at netline.net> wrote:
> Timo,
>
>        What messages should be see?  I execute the commands and shows a lot
> of messages, i dont know what it means, i m not a programmer :)
>
>
> Thanks
>
> ----
>
> Mauricio López Riffo
> Red Hat Certified Engineer
> 804006455319519
> Netline Telecomunicaciones Chile
> Los Conquistadores 2430, Providencia, Santiago.
> Codigo Postal: 7530041
> Fono: +562 6560600
> Móvil: +569 90992366
>
>> -----Mensaje original-----
>> De: Timo Sirainen [mailto:tss at iki.fi]
>> Enviado el: jueves, 29 de enero de 2009 20:46
>> Para: mauricio.lopez at netline.net; Dovecot Mailing List
>> Asunto: Re: [Dovecot] Concurrent POP3 Sessions Issues
>>
>> On Jan 29, 2009, at 1:17 PM, Mauricio López Riffo wrote:
>>
>> >     I have problems with dovecot + ldap + nfs, we could't have more than
>> > 20 concurrent sessions of pop3, when user 21 comes, the auth process
>> > takes more than 1 sec and is incresing (while most users arrives, more
>> > delay in
>> > autenticacion exists) and my customers complaint about the service.
>> > We need
>> > support about 200 concurrents pop3 users, here is my details
>>
>> Someone else was recently complaining about the same thing. Or was it you?
> Anyway,
>> dovecot-auth doesn't know how many users are logged in so if the problem
> really is 21
>> *concurrent users* instead of n logins/ second, I find it highly unlikely
> that the problem is
>> with authentication.
>>
>> My guess is that this has something to do with NFS. Perhaps start Dovecot
> with strace -tt -f
>> dovecot and then when it's slowing down see what syscall it says is
> blocking.

I had the same kind of issues. Moving dovecot to the nfs server
directly solved all my weird problems.