Index: sites/default/default.settings.php
===================================================================
RCS file: /cvs/drupal/drupal/sites/default/default.settings.php,v
retrieving revision 1.15
diff -u -p -r1.15 default.settings.php
--- sites/default/default.settings.php	6 Oct 2008 10:54:15 -0000	1.15
+++ sites/default/default.settings.php	12 Nov 2008 15:21:19 -0000
@@ -202,6 +202,8 @@ ini_set('session.cache_expire',     2000
 ini_set('session.cache_limiter',    'none');
 ini_set('session.cookie_lifetime',  2000000);
 ini_set('session.gc_maxlifetime',   200000);
+ini_set('session.gc_probability', 1);
+ini_set('session.gc_divisor', 100);
 ini_set('session.save_handler',     'user');
 ini_set('session.use_only_cookies', 1);
 ini_set('session.use_trans_sid',    0);