[Dovecot] Dovecot login slow

[Marc Perkel]

On 11/13/2013 4:34 PM, Benny Pedersen wrote:
> Marc Perkel skrev den 2013-11-14 01:13:
>
>> I does act like a DNS problem but why is DNS involved? It doesn't have
>> a delay in connecting. It's the login that's slow.
>
> you use a auth that depends on fast dns ?
>
> lost now how your dovecot -n was
>
> are we sure its dns at all ?, i see the INDEX on another path then 
> MAILDIR was, is it 2 diff harddisk drives ?
>
> is it running on shared resources ?
>

My AUTH depends only on MYSQL. There's no DNS involved. At least not 
that I can see there should be. So why would localhost take 10-15 
seconds to do the login part and coming into the servers IP address is 
instant. And in both cases the connection itself is instant. It's when I 
type in the LOGIN command that the delay occurs.


# 2.2.7: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-042stab083.2 x86_64 CentOS release 6.4 (Final) ext4
auth_master_user_separator = *
auth_mechanisms = login plain
disable_plaintext_auth = no
first_valid_uid = 12
info_log_path = /var/log/dovecot.log
log_path = /var/log/dovecot.log
login_greeting = Computer Tyme Dovecot ready.
mail_fsync = never
mail_gid = mail
mail_location = maildir:/vhome/%d/home/%n:INDEX=/email/imap-cache/%d-%n
mail_uid = mail
passdb {
   args = /etc/dovecot/sql.conf
   driver = sql
}
passdb {
   args = /etc/dovecot/master-combined-sql.conf
   driver = sql
   master = yes
   pass = yes
}
protocols = imap pop3
service anvil {
   client_limit = 20000
}
service auth {
   client_limit = 20000
   unix_listener auth-client {
     mode = 0666
   }
   unix_listener auth-master {
     mode = 0666
   }
}
service imap-login {
   process_limit = 4000
   process_min_avail = 30
   service_count = 0
}
service imap {
   process_limit = 4000
}
service pop3-login {
   process_limit = 2000
   process_min_avail = 20
   service_count = 0
}
service pop3 {
   process_limit = 2000
}
ssl_ca = </usr/share/ssl/certs/rapidssl.crt
ssl_cert = </usr/share/ssl/certs/imapd.pem
ssl_key = </usr/share/ssl/certs/imapd.pem
verbose_proctitle = yes
protocol imap {
   mail_max_userip_connections = 50
}
protocol pop3 {
   pop3_uidl_format = %v.%u
}