[Mimedefang] High CPU Utilization
Nels Lindquist
nlindq at maei.ca
Wed Mar 5 17:34:01 EST 2003
On 5 Mar 2003 at 15:56, Michael Pellegrino wrote:
> Pentium II, 256MB Ram, MD 2.30, SA 2.50, clamd 2.54, SPOOLDIR resides on a
> RAM Disk, server does maybe 1000-1200 messages per day tops. 10 min slaves,
> 30 max. timeout 90, busy timeout 300. Suse Linux 8.1 (2.4.19).
>
> We occasionally have brief spikes in email traffic, about 20-30 messages
> over a 2-4 minute time period. These are rare, but were never a problem
> until recently. We will get a few "ERR Filter timed out - system may be
> overloaded" messages along with a lot of rejected emails (Milter: data,
> reject=451 4.7.1 Please try again later).
Yes; we see these spikes as well. Sadly, they're almost always a
flood of spam--most often Nigerian scams for some reason.
> Any thoughts? I could easily upgrade the server, but for the volume of
> email this system should be just fine. It just seems to me that the CPU
> utilization on the mimedefang processes is a bit high.
We're seeing this, too. I strongly suspect that SA 2.50 is the
problem. Which options are you using with SA? Bayes? Any network
tests? DCC/Razor2?
We've got a similar setup, only with 128MB but no ramdisk. How large
is your ramdisk? During one of the "floods," I ran vmstat and
noticed a *lot* of swap activity; I suspect our machine could use
some more memory.
----
Nels Lindquist <*>
Information Systems Manager
Morningstar Air Express Inc.
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