Hello I have Red Hat Enterprise Linux 5, postfix 2.3.3 and dovecot 2.0.9. Mails are delivered to dovecot by virtual_transport=dovecot and the mailbox_command is /usr/libexec/dovecot/deliver. Everything works as expected.
In dovecot I am testing enabling zlib compression to save some IOPs and disk space. I use the software postal to generate mail load and send 30.000 messages of 2 megabytes in 1 hour, always the same test, with compression enabled & disabled. My first question is about logs. Without compression in dovecot I got log lines like this: /Feb 4 14:10:13 buzon postfix/pipe[4018]: 4EA77C7775: to=<cor...@us.es>, relay=dovecot, delay=1.6, delays=1.3/0.17/0/0.12, dsn=2.0.0, status=sent (delivered via dovecot service)/ With compression enabled: Feb 3 17:48:25 buzon postfix/pipe[8263]: 2169CC7758: to=<javierdemig...@us.es>, relay=dovecot, delay= *13*, delays= *0.83/11/0/1.2*, dsn=2.0.0, status=sent (delivered via dovecot service) I have read postfix doc about logs time stamps and I got the following: # Message delivery time stamps# delays=a/b/c/d, where# a = time before queue manager, including message transmission# b = time in queue manager# c = connection setup including DNS, HELO and TLS;# d = message transmission time. I have read the doc "postfix anatomy" and I do not fully understand each number. Let's resume it With compression in mailboxes: delay= *13*, delays= *0.83/11/0/1.2* Without compression: /delay=1.6, delays=1.3/0.17/0/0.12 The big difference is the second value, /"b - time in queue manager"/. When is the mailbox_command executed & measured ? In b or in d ? My second question: I use syslog for logging. I have the following line in /etc/syslog.conf mail.* -/var/log/maillog What can I do to improve logging perfomance? I would like to stick with standard syslog. Regards Maria
