[Mimedefang] high-load scanning with mimedefang
David F. Skoll
dfs at roaringpenguin.com
Wed Nov 27 22:29:00 EST 2002
On Thu, 28 Nov 2002, Rudolph Pereira wrote:
> The former class (cmdline) seem far too slow for busy mail servers
I would think so.
> while although the
> latter are much faster, there seem to be
> far fewer products that support a memory-resident daemon, and most of
> them are expensive
CLAM AntiVirus is free. http://clamav.elektrapro.com/
If it's feasible for your class of users, blocking .exe and friends
will block 99.99% of current viruses.
> I'm also wondering about what I should look at at getting better
> performance out of mimedefang; my tests seem to indicate about a 20%
> performance drop compared to plain sendmail.
If it's only 20%, I think that's pretty good. If you run
SpamAssassin, that figure will probably increase a lot.
Content-scanning is expensive; there's no way around it. Putting the
spool on tmpfs is practically required for a busy Solaris server.
Beyond that, the usual "fast CPU, fast disk, sufficient RAM" tuning is
about all you can do.
> Oh, most of my tests/work have been on a 2-cpu
> solaris 5.8/sparc machine with perl-5.005 and mimedefang 2.23
MD 2.27-BETA-1 and the forthcoming 2.27-FINAL may be slightly better on
busy servers, although the difference is small.
--
David.
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