[Dovecot] performance problems with rc10 and solaris 10

[Dominik Saar]

Hi,

thanks for your help!

I will set this settings and try it again.

Thats right, the server is swapping, but aren´t a problem with
alpha4 .... ?!?

Have some more memory and will spend it!!! :)

I tell you if it helps or not ...

Thanks again.

Dominik



Am Donnerstag, den 19.10.2006, 10:27 -0400 schrieb Jeff A. Earickson:
> Hi,
> 
> I am running dovecot rc10 on a Sun E220R (sparc) for 3000 users with Solaris
> 10 version 6/06 plus current patches.  While the performance isn't great 
> (it is a slow 2 cpu x 450 MHz box), it isn't bad either.
> 
> I use mbox format (/var/mail is NFS mounted) and ZFS for home directories.
> Authentication is via PAM.  PAM uses kerberos to Active Directory.
> 
> I have the following in my /etc/system file for dovecot:
> 
> * double file descriptor limits for dovecot
> set rlim_fd_cur = 65536
> set rlim_fd_max = 131072
> 
> I also discovered that I need this setting in my dovecot.conf, or it
> will fail over with the "shutting down too early/too many open files" 
> problem that is often discussed on this list:
> 
> login_process_per_connection = no
> 
> Are you sure that your E450 isn't swapping?  The "growing data stack"
> sounds like lack of memory/swap issues.
> 
> Jeff Earickson
> Colby College
> 
> On Thu, 19 Oct 2006, Dominik Saar wrote:
> 
> > Date: Thu, 19 Oct 2006 14:04:03 +0200
> > From: Dominik Saar <dominik.saar at 1und1.de>
> > To: dovecot at dovecot.org
> > Subject: [Dovecot] performance problems with rc10 and solaris 10
> > 
> > Hi,
> >
> > i have 2 dovecot imap server running on solaris 10
> >
> > The primary server with dovecot 1.0.alpha4 is running with best
> > performance on Sun Sparc E4k5 with 8x 450MHz
> >
> > The secondary with rc10 has ugly performanceproblems on Sun E450 wth 4x
> > 450MHz. Every new imap process takes permanent 25% cpu usage
> >
> > List the folder and fetch message are both slowy!
> >
> > Both servers are configred with ldap backend
> >
> >
> > preventive i deleted for rc10 the complet index and controlfiles,
> > because the spooldir is a sync from the masterserver with dovecot
> > alpha4. I thought its a little bit slowy because of my 30.000 mails.
> >
> > the indexfiles are created now, but the still ugly slow ....
> >
> > For debugging i compiled rc10 again --with-debug=yes and start dovecot
> > with solaris truss
> >
> > truss tells nothing to explain this behavor
> > logentrys from dovecot has this warnings:
> >
> > -->
> >
> > dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing pool 'storage'
> > with: 1024
> > dovecot: Oct 18 14:51:47 Info: IMAP(saar): dirsize quota limit =
> > 750000kB
> > dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing data stack with:
> > 32768
> > dovecot: Oct 18 14:51:47 Warning: IMAP(saar): Growing data stack with:
> > 65536
> > dovecot: Oct 18 14:51:48 Warning: IMAP(saar): Growing data stack with:
> > 131072
> > dovecot: Oct 18 14:51:48 Warning: IMAP(saar): Growing pool 'uidlist
> > record_pool' with: 32768
> >
> > <--
> >
> > also i compiled rc10 --with-notify=none, no result
> >
> > to ensure it isn´t the solaris system, i compiled alpha4.
> > Result: good performance
> >
> > Any ideas?
> >
> > Cheers
> >
> > Dominik
> >
> >