At 08:32 AM 9/11/2007, Benedict White wrote:
>Firstly I would like to thank Mark Martinec for an
excellent piece of code!
I second that!!
>I have a server (well I run about 10 or so now)
>
>the setups are all postfix MTA to Amavisd with
Spamassassin, using
>Razor, Pyzor and DCC.
>
>What I need to know is how far I can push the maximum
number of
>child processes (max_servers) in postfix and amavisd?
My rule of thumb is apx 5 processes per CPU/Core. That
seems to keep
the CPU loaded with body scanning while some other slower
processes
that require more time than cpu (disk/network) complete.
I've gone
as high as 10 per CPU and it's a little more efficient;
however, the
memory requirements become pretty extreme.
>Also, as one of my servers rejects 70% of the mail that
hits it, do
>I need to have the same number of smtp threads in
postfix as well as
>amavisd or can I get away with less amavisd severs?
Incoming smtp connections are always going to be much much
greater
than amavis smtp connections. For instance, a 4 core server
here I
run 750 smtpd maximum processes, while amavis gets 20. The
reason is
there are considerably more incoming connections to the mail
server
which either a) take a long time to complete due to network
connections/large attachments, and b) a lot of incoming
connections
get rejected immediately by RBLs and never reach amavis.
Another item i've noticed which has required an increase to
postfix
smtp maxproc is there are a ton of either open relays or
malware
infected machines out there that open up a smtp connection,
and sit
idle never sending anything. By default postfix will wait 5
minutes
before disconnecting them. So to solve the issue I've
increased
allowable smtp connections and also added smtpd_timeout =
30s in main.cf.
- Nate
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