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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ AMaViS-user mailing list AMaViS-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amavis-user AMaViS-FAQ:http://www.amavis.org/amavis-faq.php3 AMaViS-HowTos:http://www.amavis.org/howto/
