Ralf Hildebrandt put forth on 11/5/2010 4:23 AM:
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.
Hi Ralf,
What hardware platform? (AMD/Intel/SPARC/PPC, generation/freq) What OS platform? What compiler/version? What threading library?
If IPC is the culprit, it may very well be a platform/compiler/system library issue and not a dovecot issue, given no one else seems to be suffering this problem.
-- Stan