A very slow MS 4.62.2-3 & SA 3.2.1 & ClamAV 0.91 machine

[Gottschalk, David]

I have five mail gateways. Here are a few things I've done that helped a lot.

The item that made the biggest difference was changing 'Max Unscanned Messages Per Scan = 30' to 10, and changing 'Max Unsafe Messages Per Scan = 30' to 10 as well.

I also increased my "Max Children" to 10, but I'm still working on tweaking that (only been running MailScanner in production for a week now).

I had one machine that could not keep up with the volume of mail. I couldn't figure out why one machine was having trouble when the rest were doing fine. Soon I discovered that Spamassassin was causing a huge slow down on that one box. It was hanging for ever on checking if dns was avaiable or not. I set 'dns_available no' in the spam.assassin.prefs.conf file and things sped waaayyy up. I changed it on my other relays and it made a significant different on them as well, but not as much as the one relay that couldn't keep up with mail orginially. I still haven't figured out why it so greatly effected that one machine.

Hope that helps.

Good luck.

David Gottschalk
Emory University Infrastructure Technology Services
david.gottschalk at emory.edu

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Quentin Campbell
Sent: Thursday, July 12, 2007 11:37 AM
To: MailScanner discussion
Subject: A very slow MS 4.62.2-3 & SA 3.2.1 & ClamAV 0.91 machine

I have a very slow mail gateway among the 4 that I have just upgraded.

They all run MS 4.62.2-3, SA 3.2.1 and ClamAV 0.91 and should have identical configurations for MS and SA. MCP processing is done and it is the same on all 4.

There were 211 batches of 30 messages each processed on the slow machine. Overall the average time to process each message is 15 seconds!

The last two of these batches were processed by running MailScanner in debug mode. The average processing time for each message then dropped to between 2 and 3 seconds!

I am trying to get a handle on why this machine is so slow. Any suggestions to help further my investigation are welcome.

Quentin
---
PHONE: +44 191 222 8209    Information Systems and Services (ISS),
                           Newcastle University,
                           Newcastle upon Tyne,
FAX:   +44 191 222 8765    United Kingdom, NE1 7RU.
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