High Load Avg and Context Switches

[Luc Brouard]

On Wed, Mar 19, 2003 at 04:34:32PM -0600, Jeremy Sanders wrote:
> We remounted the imap and postfix partitions as ext2 and it is smoking.
> Now we just have to figure out how to tweak ext3 to work better. I think
> a bigger journal size might help, it is flushing to disk too often and
> the pop3d processes are piling up waiting on it to flush...

Check Ralf Hildebrandt pages on ext3 for postfix.
Many tips there to tune your conf.

Luc
> 
> Jeremy
> 
> >>> Henrique de Moraes Holschuh <hmh at debian.org> 03/19/03 03:35PM >>>
> On Wed, 19 Mar 2003, Jeremy Sanders wrote:
> > changed to skiplist. It's not all pop3, but it is mostly pop3 in the
> D
> > state. There are some lmtpd, cleanup(postfix), and every once in a
> while
> > kjournald is in DW. When the load really spikes like 30 pop3d
> processes
> 
> Looks like LDAP is hosing your system down, if cleanup is in D state.
> Are
> you using any sort of LDAP maps in postfix?
> 
> > are in state D waiting for disk IO I presume. I don't know if the
> pop3d
> > processes are waiting for authenticaiton or for mailbox access
> though.
> 
> Strace them, and see if they hang talking to saslauthd, then...
> 
> -- 
>   "One disk to rule them all, One disk to find them. One disk to bring
>   them all and in the darkness grind them. In the Land of Redmond
>   where the shadows lie." -- The Silicon Valley Tarot
>   Henrique Holschuh