Super Slow Queue Processing

[Peter Russell]

Hi there, we have a MailScanner system that has had a lot (any) 
attention for 6 months or so and all of a sudden it is unable to process 
the messages in the queue faster than they are building up.

Doing an sa -D -t < on any of the high scoring spam messages i have is 
very quick (less than 5sec). there was some error about hash from 
sa-learn --force-expire, a google revealed naught so i disabled bayes 
for now. but it maks no difference.

But changing Use Spamassassin to no means the queue is processed 
lightening quick. which seems weird because SA appears to run quite quick.

The messages do eventually seem to get processed but it takes quite a 
while (upto 30min) and the queue seems to be growing muh quicker than 
processing.

MS debug takes AGES.

I cant seem to find anything useful or interesting in the logs, i have 
attached the output of the MS debug (yes i need to update clamav).

Appreciate ANY tips on how to diagnose (or hopefully fix) this. :)

Many thanks
Pete


MailScanner version 4.55.9
SpamAssassin version 3.1.8
   running on Perl version 5.8.5
Linux Centos 2.6.9-11.ELsmp
Postfix 2.3 (HOLD method)

tarting MailScanner daemons:
          incoming postfix :                                [  OK  ]
          outgoing postfix :                                [  OK  ]
          MailScanner:       In Debugging mode, not forking...
LibClamAV Warning: ********************************************************
LibClamAV Warning: ***  This version of the ClamAV engine is outdated.  ***
LibClamAV Warning: *** DON'T PANIC! Read http://www.clamav.net/faq.html ***
LibClamAV Warning: ********************************************************
LibClamAV Warning: ********************************************************
LibClamAV Warning: ***  This version of the ClamAV engine is outdated.  ***
LibClamAV Warning: *** DON'T PANIC! Read http://www.clamav.net/faq.html ***
LibClamAV Warning: ********************************************************
Ignore errors about failing to find EOCD signature
format error: can't find EOCD signature
  at /usr/sbin/MailScanner line 820

<snip>

format error: can't find EOCD signature
  at /usr/sbin/MailScanner line 820
Stopping now as you are debugging me.
commit ineffective with AutoCommit enabled at 
/usr/lib/MailScanner/MailScanner/CustomFunctions/MailWatch.pm line 93, 
<CLIENT> line 1422.
Commmit ineffective while AutoCommit is on at 
/usr/lib/MailScanner/MailScanner/CustomFunctions/MailWatch.pm line 93, 
<CLIENT> line 1422.
                                                            [  OK  ]