Performance problems...

[Ugo Bellavance]

> -----Message d'origine-----
> De : Eric J Merkel [mailto:merkel at METALINK.NET]
> Envoyé : Friday, January 30, 2004 4:11 PM
> À : MAILSCANNER at JISCMAIL.AC.UK
> Objet : Re: Performance problems...
> 
> 
> See comments in-line...
> ----- Original Message -----
> From: "Kevin Spicer" <kevins at BMRB.CO.UK>
> To: <MAILSCANNER at JISCMAIL.AC.UK>
> Sent: Friday, January 30, 2004 3:31 PM
> Subject: Re: Performance problems...
> 
> 
> > On Fri, 2004-01-30 at 19:49, Eric J Merkel wrote:
> > > I've tried turning off all virus notifications and tweaked the
> > > mailscanner.conf to process messages both in batch and in 
> queue. While
> in
> > > batch mode, I also tried changing the number of messages 
> in the batch to
> > > process at any one time but it doesn't seem like 
> mailscanner can keep up
> > > with the number of incoming messages passing thru the 
> system. I've also
> > > lowered sendmail's logging level to 0, turned off fsync on
> /var/log/maillog.
> > > I tried splitting the mqueue.in directory into multiple 
> directories but
> > > couldn't get sendmail to drop the files into directories under
> mqueue.in.
> > > Yes I did change the sendmail startup command to change 
> the incoming
> queue
> > > directory to mqueue.in/* and also in mailscanner.conf. So 
> at last, I am
> > > wondering what else I can try to improve the throughput 
> of the system?
> > >
> >
> > If you have not done so already try putting the MailScanner work
> > directory (/var/spool/mailscanner/incoming) in tmpfs  
> (assuming memory
> > isn't the issue of course).  I presume you are not using 
> SpamAssassin?
> >
> 
> No we are not using SA. I will look into mounting the MS 
> incoming directory
> on a tempfs. Do you have any recommendation on how much RAM I 
> should set
> aside for the tmpfs?

Redhat?  It will allocate it dynamically

> 
> > I'd guess you are getting a lot of MyDoom related emails?  
> One problem
> > this causes is messages to accounts that don't exist.  If you have
> > MailScanner set to still deliver disinfected / cleaned 
> messages then the
> > bounces from these may cause extra load on your server.
> >
> 
> I do not have it set to deliver cleaned/disinfected messages. 
> I do have a
> fair number of bounced spam messages from unknown user accounts on our
> system. Right now I have a script clean out the mqueue every 
> 10 minutes of
> all invalid bounce messages.
> 
> > There were some useful sendmail rules (both subject and recipient)
> > posted to the list which can help to block MyDoom.
> >
> 
> I just joined the list today so I didn't get a chance to see 
> those filters.
> Do you have the subject of those messages so I can look them up in the
> archive?
> 
> Thanks in advance,
> 
> Eric
>