[Dovecot] Ongoing performance issues with 2.0.x

[Ralf Hildebrandt]

Due to the ongoing performance issues with 2.0.x I switched back to
1.2.15 yesterday evening, with no changes to the machine or my users.

(I migrated from 1.2.15 to 2.0.x by converting the existing config)

Today, we have MUCH LESS load, with the same number of logins/min.

I cannot say what exactly causes this immense increase in load, but one
observation is that the time spent in system() has now dropped (user and
iowait have stayed contant) to a third of the values I was seeing with
2.0.x.

This evening I'll post some graphs showing two comparable 24  hour
ranges.

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebrandt at charite.de | http://www.charite.de