Murray, You may remember that I have been complaining about long times it takes for a dkim-milter (with Postfix) to sign long messages.
The mystery has now been explained, it is due to a deadlock between a sender's Nagle algorithm and receivers's delayed ACK policy. At each deadlock the session stalls for 0.1 seconds. The problem is avoided in a sendmail setup because sendmail uses larger buffer for sending mail contents to a milter, which doesn't trigger TCP congestion avoidance mechanisms. The problem is being addressed. See a thread starting at: http://marc.info/?l=postfix-users&m=118546060709676 http://marc.info/?l=postfix-users&m=118547823903681 also: http://www.sigcomm.org/ccr/archive/2001/jan01/ccr-200101-mogul.pdf Mark ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ dkim-milter-discuss mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dkim-milter-discuss
