Re: Dovecot Director upgrade from 2.2 to 2.3

On 31 Jul 2019, at 15.41, Alessio Cecchi via dovecot dovecot@dovecot.org wrote:

Hi Timo,

here you can see two images with the load average and CPU usage with Dovecot 2.2 (Centos 6) and 2.3 (Centos 7) on the same hardware and same configuration:

https://imgur.com/a/1hsItlc https://imgur.com/a/1hsItlc Load average increment is relevant but CPU usage is similar.

Load average changes can be rather difficult to debug if it's not because of any CPU usages or disk IO, and in your graphs those hadn't really changed. One more possibility could be to look at context switches, but do you have those from before the upgrade? (sar database?) Also since you changed CentOS 6 -> 7 it could be possible that it has nothing to do with Dovecot at all.