[Dovecot] NFS performance and 1.1.3 - what can you (unofficially) get away with?

[Jack Stewart]

Thanks. I would like to give the patches a try.

I've removed all of the redhat patches except for the one that tells 
dovecot where to find the certs (why does redhat use pki? why?) but I 
haven't installed this version yet. Are there any build/configure 
twiddles that might help?

Just as an update, I tried 1.1.3 with the nfs settings below. At first, 
it was horrid. Then I deleted the old index cache files. Now it seems to 
be working well (with webmail - major service is not yet moved). The 
load is under 1.

I've managed to descend into the twilight zone yet again. Just rolling 
one server and just rolling webmail for now - we'll see where it goes.

---Jack

Timo Sirainen wrote:
> On Wed, 2008-09-10 at 12:20 -0700, Jack Stewart wrote:
>> The performance hit was bad. When I tried "mail_nfs_index = yes" the 
>> load went from 0.5 to 120+ (on each of three servers).
> 
> It shouldn't have been anything that bad. I could send you some patches
> that reduce what mail_nfs_index=yes does. It would be interesting to
> know if the problem is just one or few specific calls or all of them
> cumulatively.
> 
>> dotlock_use_excl: no
> 
> "yes" should be safe (and faster) here.
> 

-- 
Jack Stewart
jstewart at caltech.edu / 626-395-4690
http://www.imss.caltech.edu