On 3. Feb 2025, at 7.05, Anatoliy Zhestov via dovecot <dovecot@dovecot.org> wrote: > > Hi. We have a performance problem with imap authentication through > postgresql. > Our servers(modoboa based) have a big amount of permanent imap > connections(5000-50000). > Current performance is about 3000 successful authentications per hour. No > visible reasons for such low speed. Accordingly, after a network failure or > server restart, all clients try to reconnect, but restoring the connection > pool takes hours and even tens of hours. Judging by the logs after the > restart, a huge number of auth requests closed by timeout after 70-90 > seconds. The postgresql database is not overloaded at the restore > connections process and the postgresql connection pool (100) does not > overflow. Manually started sql auth queries work fast, tables have indexes. > So I guess there is a bottleneck somewhere in dovecot auth service or > postgresql driver.
Are you sure the problem is authentication / pgsql? You could test with looping "doveadm auth lookup $user" rapidly. Of course for different users to avoid them coming from cache. Or if you can reproduce it that way, try if the same happens for repeating the same user so it does come from cache. _______________________________________________ dovecot mailing list -- dovecot@dovecot.org To unsubscribe send an email to dovecot-le...@dovecot.org
