On 3.1.2012, at 16.54, Mikko Lampikoski wrote: > I got Dual Core Intel Xeon CPU 3.00GHz, over 1000 mailbox and almost 1 > dovecot login / second (peak time). > Server stats says that load is continually over 2 and cpu usage is 60%. top > says that imap is making this load.
You mean an actual "imap" process? Or more than one imap processes? Or something else, e.g. "imap-login" process? If there's one long running IMAP process eating CPU, it might have simply gone to an infinite loop, and upgrading could help. > virtual users are in mysql database and mysqld is running on another server > (this server is ok). > > Do I need better CPU or is there something going on that I do not understand? Your CPU usage should probably be closer to 0%. > login_process_size: 128 > login_processes_count: 10 > login_max_processes_count: 2048 Switching to http://wiki2.dovecot.org/LoginProcess#High-performance_mode may be helpful. > mail_nfs_storage: yes Do you have more than one Dovecot server? This setting doesn't anyway work reliably. If you've only one server accessing mails, you can set this to "no".
