The listen pipes are just for STMPD (and any other process that sends a message) to tell the queue manager that a file is waiting in the spool directory for delivery. I've flooded SMTPD with messages in stress testing many times and I've never needed more than six. The function that talks to QM through the pipe will retry several times before giving up, so a pipe usually becomes available. The actually communication through the pipe is very small and fast, and the queue manager has a dedicated thread to reading messages off the pipe. Even if you didn't have enough pipes set for your environment, when the queue manager starts a queue run it looks in the spool directory for any messages that it doesn't know about. Having 20 pipes is not going to hurt you, it's just having the queue manager use more system resources than it really needs.
Tripp ----- Original Message ----- From: "Markus Gufler" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, March 05, 2005 7:33 PM Subject: RE: Re[2]: [IMail Forum] To anyone who bought a 3Com Nic > Listen pipes listen for connections from SMTPD to QM (or > Declude/mxGuard to QM), not connections from Internet to > SMTPD. I suspect you're thinking otherwise. The socket > bottleneck at SMTPD makes increasing listen pipes beyond 64 > useless. Delivery threads are QM threads (SMTP clients in > your comparison). This is also why I'm not sure if my settings are "the best" I can set up for my needs. Even if I understand what for example "max listen pipes" means I don't know why this value is set as default to 4 and what are the drawbacks when setting it to the maximum allowed value of 20. I'm monitoring the server from both outside as inside (logfiles) and can't see any problems up to now. So I believe the values are ok. Markus To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
