On 27.6.2012, at 14.55, Emmanuel Dreyfus wrote: > On Wed, Jun 27, 2012 at 12:50:20PM +0300, Timo Sirainen wrote: >> What mailbox format do you use? This shouldn't be a problem with for >> example mdbox, probably not with sdbox either and with mbox/maildir >> there are settings that can improve this. > > This is mbox. > >> Or are you not talking about opening the mailbox, but about clients >> redownloading all the mails all the time? > > I don't think the client downloads the whole mailbox each time. It > takes so long on a 1 GB mbox that the users would have complained. > However, I can see a lot of disk I/O activity for pop daemon operating > on the bigger mbox (easy to spot looking at the process uid)
Try mbox_very_dirty_syncs=yes
