On Sun, Dec 21, 2014 at 09:13:53AM +0000, Jonathan K. Tullett wrote:
> Have there been huge improvements to the efficiency of the code base
> between 2.6 and 2.9 (or 2.11)? Does anyone have suggestions on where else
> I can look for the cause?
>
> Thank you in advance for any help you can provide.
Injection of mail into the maildrop directory is delayed primarily
by disk seek latency (write+fsync performace) and getpwuid() latency.
To measure Postfix-related disk performance use the "fsstone"
program that is included in the Postfix source distribution.
Make sure passwd(5) lookups are not slowed down by remote
LDAP servers, ...
Otherwise, make sure that pickup(8) is not slowed down by
"inflow_delay", because during message injection qmgr is not
scheduled often enough. Or the DKIM milter is not slowed down by
DNS lookup timeouts.
--
Viktor.
