[Dovecot] performance 2.1.17 zlib maildir

[Robert Schetterer]

Am 22.07.2013 14:23, schrieb Robert Schetterer:
> Am 22.07.2013 13:50, schrieb Ralf Hildebrandt:
>> * Robert Schetterer <rs at sys4.de>:
>>> Am 20.07.2013 20:30, schrieb Robert Schetterer:
>>>> Hi Timo, i have reports from few users about lost performance with 2.17
>>>> maildir bigger mailboxes ( up to 2 GB ), i also use zlib plugin
>>>>
>>>> what about this patch.....,may not working as i should?
>>>>
>>>> http://hg.dovecot.org/dovecot-2.1/rev/9c23d1fb8969
>>>>
>>>> Best Regards
>>>> MfG Robert Schetterer
>>>>
>>>
>>>
>>> i checked this reverting to 2.1.15 (had only this pre compiled)
>>> perfomance gets better with this, looks like the problem is getting more
>>> worst with having bigger mailboxes and heavy use of subfolder trees
>>> any idea?
>>
>> I wonder why this would matter. zlib is compressing EACH message
>> individually, so the actual SIZE of the mailbox would not matter (the
>> number of message would matter, though).
>>
>> Which operations are slow? Folder listing? Actually accessing messages?
> 
> accessing , list messsages , copy, move delete operations
> 
> it must not be zlib related, that was a guess
> there are two other patches only maildir related might be a better guess
> 
> http://hg.dovecot.org/dovecot-2.1/rev/7389ff729d2e
> http://hg.dovecot.org/dovecot-2.1/rev/4c05b9447a10
> 
> other patches dont look related to me, however i use a lot of other
> plugins which might also involved
> 
> sorry not easy to measure , but performance here is def better with
> 2.1.15 , same client setup, no special failures about that in debug logs
> 
> 
> 
>>
> 
> 
> 
> Best Regards
> MfG Robert Schetterer
> 

back to 2.1.17

looks like

rising values for /proc/sys/fs/inotify/max_user_instances
helped however i got no warning in the logs

so wait and and see for now



Best Regards
MfG Robert Schetterer

-- 
[*] sys4 AG

http://sys4.de, +49 (89) 30 90 46 64
Franziskanerstraße 15, 81669 München

Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263
Vorstand: Patrick Ben Koetter, Axel von der Ohe, Marc Schiffbauer
Aufsichtsratsvorsitzender: Florian Kirstein