[Linux-cluster] Performance tuning help sought

[Ferenc Wagner]

Kadlecsik Jozsef <kadlec at sunserv.kfki.hu> writes:

> I believe our performance problem might come from bouncing locks: there is 
> no way to deliver incoming mail systematically to the same machine where 
> the user is actually logged in or connected to via POP/IMAP. So when we 
> see bad performance that may be the result of delivering to one machine 
> and accessing the mailbox from another one.
>
> Which knobs should we tune in order to achieve the fastest lock 
> processing?

Hi,

Try starting gfs_controld with -l0, and maybe decrease demote_secs
(you don't access the same file repeatedly after all).
-- 
Cheers,
Feri.