Describe memcache connection configuration options in defaults

config/defaults.inc.php

@@ -384,6 +384,19 @@ $config['session_storage'] = 'db';
 // Define any number of hosts in the form of hostname:port or unix:///path/to/socket.file
 $config['memcache_hosts'] = null; // e.g. array( 'localhost:11211', '192.168.1.12:11211', 'unix:///var/tmp/memcached.sock' );
 
+// Controls the use of a persistent connections to memcache servers
+// See http://php.net/manual/en/memcache.addserver.php
+$config['memcache_pconnect'] = true;
+
+// Value in seconds which will be used for connecting to the daemon
+// See http://php.net/manual/en/memcache.addserver.php
+$config['memcache_timeout'] = 1;
+
+// Controls how often a failed server will be retried (value in seconds).
+// Setting this parameter to -1 disables automatic retry.
+// See http://php.net/manual/en/memcache.addserver.php
+$config['memcache_retry_interval'] = 15;
+
 // check client IP in session authorization
 $config['ip_check'] = false;