Performance and accuracy issues

Julian Field mailscanner at
Sun Feb 15 08:41:15 GMT 2004

At 18:42 13/02/2004, you wrote:
>Michael Dahlberg [dahlberg at] wrote:
> > Fanatastic piece of software...I can't imagine running a mail server
> > without it.  However, the latest upgrade (from 4.13-3 to 4.26.8) has
> > uncovered a few issues.
> >
> > A little about our config: MailScanner (4.26.8) runs with Sophos
> > (3.78d) on a dual processor Sun 220R with 2GB RAM. The
> > MailScanner.conf file is set to start 10 child processes which will
> > scan a max of 30 messages.  MailScanner also runs in queue mode rather
> > than batch.  We do no spam analysis, just virus scanning.  I've also
> > installed the first perl mod that Julian Fields released a
> > couple of days ago.
> >
> > I've noticed that when running the SAVI engine (Virus Scanner =
> > sophossavi), rather than `sweep` (Virus Scanner = sophos) it
> > takes about 3x as long with the SAVI engine (approx. 3 min to scan 100
> > messages using SAVI versus 1 min with sweep).  Also when I use the
> > SAVI engine, more MyDoom-infected email messages are found and
> > removed.
> >
> > Is this the experience of other readers of this list?  Does anyone
> > have an explanation or advice on which virus scanner (Sophos or SAVI)
> > to use?
> >
>   Unfortunately, we had to downgrade MailScanner back to 4.13-3.
>   The rate at which messages were being scanned and moved to an
>   outbound mail queue was so slow that mail delivery times had
>   increased to half an hour and the inbound queue size was steadily
>   increasing.

Switch on the speed logging with "Log Speed = true" and see if it sheds any
light on the subject. Take a careful look at the "Allow Form Tags" and the
other related HTML tag checks. If you switch off detection and logging of
all of them, it optimises the code out completely.

Have you added any large rulesets since your 4.13 installation?

Julian Field
Professional Support Services at
MailScanner thanks transtec Computers for their support
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