Len Conrad wrote:
>>> But I still feel there's something throttling amavis with the current
>>> hardware. This machine groans on passing 900 - 1100 msgs/hour?  I
>>> think it can do a lot better.

You need to find out where the bottleneck is.  Most "average" 
email messages should go through amavisd-new in a few seconds 
with ~95% of the time spent in SA.

Running amavisd-nanny for a couple minutes will show if you 
are really using all your amavis workers.

Running amavisd-new at loglevel 2 or above will log timing 
details.

I expect this to tell you that amavisd-new is spending all its 
time running spamassassin, but best to confirm this before 
barking up the wrong tree.

Then you can run amavisd with sa-debug or run some standalone 
spamassassin -D scans from the command line to see where SA is 
spending its time.

The usual suspects are RBL or other network tests.  Maybe 
temporarily disable those tests (or set their timeouts really 
low) in SA.

Other things that commonly take a long time are a slow file 
system or using a non-deamonized virus scanner, such as using 
"clamscan" rather than "clamdscan".

Remember - measure twice, cut once.

-- 
Noel Jones

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