dovecot - Jun 2007 - tweaking performance

Hi, I was wondering if anyone had some ideas on what I can tweak to gain
more performance. We have tome timeouts reports on pop3 during heavy load
periods. Using imap/pop3 with maildir with 7,000 users using mostly pop3.


# /usr/local/etc/dovecot.conf
protocols: imap pop3
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /usr/local/var/run/dovecot/login
login_executable(default): /usr/local/libexec/dovecot/imap-login
login_executable(imap): /usr/local/libexec/dovecot/imap-login
login_executable(pop3): /usr/local/libexec/dovecot/pop3-login
login_greeting: Cape.Com D-V.1 wpam - ready.
login_processes_count: 16
login_max_processes_count: 500
max_mail_processes: 9000
mail_location: maildir:/home/%1u/%u/Maildir
maildir_copy_with_hardlinks: yes
mail_executable(default): /usr/local/libexec/dovecot/imap
mail_executable(imap): /usr/local/libexec/dovecot/imap
mail_executable(pop3): /usr/local/libexec/dovecot/pop3
mail_plugin_dir(default): /usr/local/lib/dovecot/imap
mail_plugin_dir(imap): /usr/local/lib/dovecot/imap
mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %v.%u
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
  count: 6
  passdb:
    driver: pam
  userdb:
    driver: passwd

TIA, PA

> We have tome timeouts reports on pop3 during heavy load
> periods. Using imap/pop3 with maildir with 7,000 users using mostly pop3.
It's hard to tweak something without knowing the problem.

Run top / iostat / vmstat to get an idea why your system becomes slow:

 - CPU ?
 - Disk-IO ?

Regards,
 Adrian


-- 
 RFC 1925:
   (11) Every old idea will be proposed again with a different name and
        a different presentation, regardless of whether it works.