Hello, I am playing with 3.0.8 version processing just Accounting Requests.The goal is get over more than 1.600 req/s. Up to 1000/req it is fine. MySQL DB has max_connections = 2048. It can run for half of a day and then it crashes accidentally: Tue Apr 28 12:52:06 2015 : Info: rlm_sql (sql_instance_mobile_direct): 665 of 696 connections in use. Need more spares Tue Apr 28 12:52:06 2015 : Info: rlm_sql (sql_instance_mobile_direct): Opening additional connection (1645), 192 of 304 pending slots used Tue Apr 28 12:52:06 2015 : Error: rlm_sql_mysql: Couldn't connect to MySQL server radius@localhost:gprscalls Tue Apr 28 12:52:06 2015 : Error: rlm_sql_mysql: MySQL error: Can't create UNIX socket (24) Tue Apr 28 12:52:06 2015 : Error: rlm_sql (sql_instance_mobile_direct): Opening connection failed (1624) Tue Apr 28 12:52:06 2015 : Error: rlm_sql_mysql: Couldn't connect to MySQL server radius@localhost:gprscalls Tue Apr 28 12:52:06 2015 : Error: rlm_sql_mysql: MySQL error: Can't create UNIX socket (24) and later on in the log: Tue Apr 28 12:52:06 2015 : ERROR: (1086382) detail.mobile: ERROR: Couldn't open file /var/log/freeradius/radacct/detail.mobile/queue-11/detail-2015042812: Failed calling dup(): Too many open files Tue Apr 28 12:52:06 2015 : ERROR: (1086380) detail.mobile: ERROR: Couldn't open file /var/log/freeradius/radacct/detail.mobile/queue-9/detail-2015042812: Failed calling dup(): Too many open files Tue Apr 28 12:52:06 2015 : ERROR: (1086383) detail.mobile: ERROR: Couldn't open file /var/log/freeradius/radacct/detail.mobile/queue-9/detail-2015042812: Failed to open file /var/log/freeradius/radacct/detail.mobile/queue-9/detail-2015042812: Too many open files Config: listen { ipaddr = * port = 1813 type = acct limit { } } preacct { preprocess acct_unique_mobile } accounting { redundant { sql_instance_mobile_direct group { linelog detail.mobile } } if (noop) { ok } } } sql sql_instance_mobile_direct { query_timeout = 1 driver = "rlm_sql_mysql" dialect = "mysql" server = "localhost" port = 3306 login = "radius" password = "xxxxxxxxxxx" radius_db = "gprscalls" acct_table1 = "radacct" acct_table2 = "radacct" postauth_table = "radpostauth" authcheck_table = "radcheck" groupcheck_table = "radgroupcheck" authreply_table = "radreply" groupreply_table = "radgroupreply" usergroup_table = "radusergroup" delete_stale_sessions = yes logfile = ${logdir}/sqllog_dslres.sql pool { start = 200 min = 20 max = ${thread[pool].max_servers} spare = 80 uses = 0 lifetime = 0 idle_timeout = 120 } client_table = "nas" $INCLUDE ${modconfdir}/${.:name}/main/${dialect}/queries_mobile.conf } It is a test system so far. I can provide all debugs if needed. Thanks Ales