Postfix daemons waiting for a lock on queue_directory/pid/smtpd and queue_directory/pid/smtpd are a symptom: there are more smtpd and cleanup service daemon processes than the number of connections to the smtpd and cleanup service at that point in time. The idle processes are the residue of a recent burst in traffic. They do not slow down Postfix.
The number of processes will peak at a number that depends on traffic volume (duh) AND on the time to service an SMTP client. My educated guess is that Postfix is taking more time in DNS lookups: in the SMTP daemon doing in FCRDNS checks; or in anti-spam software, doing DNS reputation lookups. See also: https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS Wietse _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
