Huge performance problems after updating from 2.4 to 2.5.8

[Bron Gondwana]

On Fri, Jul 15, 2016, at 23:52, Bron Gondwana via Info-cyrus wrote:
> On Fri, Jul 15, 2016, at 23:46, Andy Dorman via Info-cyrus wrote:
> > So if the issue apparently lies with twoskip, can we keep our dbs using 
> > skiplist and do the 2.4 -> 2.5 upgrade?  Is it possible -h could revert 
> > back to skiplist?
> 
> You can convert a db back just by changing the setting in imapd.conf and restarting - it will convert itself.
> 
> mboxlist_db: skiplist
> 
> > If it could help we could test upgrading to 2.5.8 on our dev server 
> > while leaving our database(s) as skiplist.
> 
> Twoskip should be fixed in 2.5.9.  I've worked out what went wrong, and am working on patches now :)

Patches have passed all the tests - they're on master and 2.5.  I'm pushing to FastMail's testing stores and then going to bed :)

-- 
  Bron Gondwana
  brong at fastmail.fm