[Dovecot] How to debug slow operation

[Timo Sirainen]

On Tue, 2007-10-23 at 13:50 +0200, zbigniew szalbot wrote:
> mail_plugins(imap): quota imap_quota
> mail_plugins(pop3): quota
..
>   userdb:
>     driver: sql
>     args: /usr/local/etc/dovecot-postfix-sql.conf

Your strace showed lots of lstat() calls. Does your user_query in
dovecot-postfix-sql.conf return "dirsize" as the quota backend? That's a
really bad idea with maildir. Use "maildir" backend instead.
http://wiki.dovecot.org/Quota

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