[Dovecot] migration 1.2.5 -> 2.0.5 load increased dramatically

[Ralf Hildebrandt]

* Ralf Hildebrandt <Ralf.Hildebrandt at charite.de>:
> During norml operation this morning we're seeing a significantly
> increased load on the IMAP server (factor 5, from 5 to 25).
> 
> Does dovecot need to rebuild index files or perform other IO intensive
> operations after the upgrade?
> 
> We're using Maildir
> 
> Our monitoring shows increased "system" time. We're runnign fewer
> processes, the IO rate ist identical to yesterday, memory usage is
> identical.

I found the reason: My excessive number of ca-certificates!

dovecot-lda invoke doveconf, which in turn needs a whooping 1.2s
wallclock time to parse the config!

I pruned the ca-certificates file and removed ALL ca-certificates but
the ones that belong to the certificate chain for postamt.charite.de

-- 
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