Performance tuning in Dovecot's configuration.

2 files changed, 11 insertions, 3 deletions

diff --git a/roles/IMAP/files/etc/dovecot/conf.d/10-master.conf b/roles/IMAP/files/etc/dovecot/conf.d/10-master.conf
index 30a6f8b..30e9fb6 100644
--- a/roles/IMAP/files/etc/dovecot/conf.d/10-master.conf
+++ b/roles/IMAP/files/etc/dovecot/conf.d/10-master.conf
@@ -1,82 +1,90 @@
 #default_process_limit = 100
 #default_client_limit = 1000
 
 # Default VSZ (virtual memory size) limit for service processes. This is mainly
 # intended to catch and kill processes that leak memory before they eat up
 # everything.
 #default_vsz_limit = 256M
 
 # Login user is internally used by login processes. This is the most untrusted
 # user in Dovecot system. It shouldn't have access to anything at all.
 default_login_user = dovenull
 
 # Internal user is used by unprivileged processes. It should be separate from
 # login user, so that login processes can't disturb other processes.
 default_internal_user = dovecot
 
 service imap-login {
+  inet_listener imap {
+    port = 0
+  }
   inet_listener imaps {
     port = 993
     ssl = yes
   }
 
   # Number of connections to handle before starting a new process. Typically
   # the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
   # is faster. <doc/wiki/LoginProcess.txt>
   service_count = 1
 
+  # Max. number of IMAP processes (logins)
+  process_limit = 256
+
   # Number of processes to always keep waiting for more connections.
-  #process_min_avail = 0
+  process_min_avail = 4
 
   # If you set service_count=0, you probably need to grow this.
   #vsz_limit = $default_vsz_limit
 }
 
 service pop3-login {
   inet_listener pop3 {
     #port = 110
   }
   inet_listener pop3s {
     #port = 995
     #ssl = yes
   }
 
   service_count = 1
 }
 
 service lmtp {
   user = vmail
-  process_min_avail = 3
 
   unix_listener /var/spool/postfix-mda/private/dovecot-lmtpd {
     group = postfix
     user = postfix
     mode = 0600
   }
 
   # Create inet listener only if you can't use the above UNIX socket
   #inet_listener lmtp {
     # Avoid making LMTP visible for the entire internet
     #address =
     #port = 
   #}
+
+  # Number of processes to always keep waiting for more connections.
+  process_min_avail = 4
 }
 
 service imap {
   # Most of the memory goes to mmap()ing files. You may need to increase this
   # limit if you have huge mailboxes.
   #vsz_limit = $default_vsz_limit
 
   # Max. number of IMAP processes (connections)
   #process_limit = 1024
 }
 
 service pop3 {
   # Max. number of POP3 processes (connections)
   #process_limit = 1024
 }
 
 service auth {
   # auth_socket_path points to this userdb socket by default. It's typically
   # used by dovecot-lda, doveadm, possibly imap process, etc. Users that have
   # full permissions to this socket are able to get a list of all usernames and
diff --git a/roles/IMAP/files/etc/dovecot/conf.d/20-imap.conf b/roles/IMAP/files/etc/dovecot/conf.d/20-imap.conf
index 6771cc7..fa127c6 100644
--- a/roles/IMAP/files/etc/dovecot/conf.d/20-imap.conf
+++ b/roles/IMAP/files/etc/dovecot/conf.d/20-imap.conf
@@ -1,33 +1,33 @@
 ##
 ## IMAP specific settings
 ##
 
 protocol imap {
   # Maximum IMAP command line length. Some clients generate very long command
   # lines with huge mailboxes, so you may need to raise this if you get
   # "Too long argument" or "IMAP command line too large" errors often.
   #imap_max_line_length = 64k
 
   # Maximum number of IMAP connections allowed for a user from each IP address.
   # NOTE: The username is compared case-sensitively.
-  #mail_max_userip_connections = 10
+  mail_max_userip_connections = 16
 
   # Space separated list of plugins to load (default is global mail_plugins).
   #mail_plugins = $mail_plugins antispam
 
   # IMAP logout format string:
   #  %i - total number of bytes read from client
   #  %o - total number of bytes sent to client
   #imap_logout_format = bytes=%i/%o
 
   # Override the IMAP CAPABILITY response. If the value begins with '+',
   # add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
   #imap_capability = 
 
   # How long to wait between "OK Still here" notifications when client is
   # IDLEing.
   #imap_idle_notify_interval = 2 mins
 
   # ID field names and values to send to clients. Using * as the value makes
   # Dovecot use the default value. The following fields have default values
   # currently: name, version, os, os-version, support-url, support-email.