Hello,

During some call peaks, FS replies with 503 Maximum Calls and produces the following log:

/var/log/freeswitch/freeswitch.log.2016-12-12-10-20-33.1:2016-12-12 10:08:54.964919 [CRIT] switch_core_session.c:2270 Over Session Limit! 973

/var/log/freeswitch/freeswitch.log.2016-12-12-10-20-33.1:2016-12-12 10:08:54.964919 [CRIT] mod_sofia.c:4406 Error Creating Sessi

I dig into the configuration to change many settings related to this error. So, our current "status" is:

FreeSWITCH (Version 1.6.5 git 70b8c17 2015-11-20 20:57:50Z 64bit) is ready

1207363 session(s) since startup

684 session(s) - peak 983, last 5min 694

0 session(s) per Sec out of max 400, peak 164, last 5min 8

973 session(s) max

min idle cpu 0.00/39.77

Current Stack Size/Max 240K/8192K

I don't understand how the 973 sessions max is determined? The switch.conf.xml is set as follow:

  <settings>

    <param name="colorize-console" value="true"/>

    <param name="dialplan-timestamps" value="false"/>

    <param name="max-db-handles" value="50"/>

    <param name="db-handle-timeout" value="10"/>

    <param name="max-sessions" value="4000"/>

    <param name="sessions-per-second" value="400"/>

    <param name="loglevel" value="debug"/>

    <param name="mailer-app" value="sendmail"/>

    <param name="mailer-app-args" value="-t"/>

    <param name="dump-cores" value="yes"/>

    <param name="rtp-enable-zrtp" value="false"/>

    <param name="min-idle-cpu" value="0"/>

    <param name="enable-clock-nanosleep" value="true"/>

  </settings>

I also made modifications to the OS himself, into limits.conf:

freeswitch       hard    nofile          500000

freeswitch       soft    nofile          500000

freeswitch       hard    nproc           62815

freeswitch       soft    nproc           62815

The setup looks to be active:

# cat /proc/25695/limits

Limit                     Soft Limit           Hard Limit           Units    

Max cpu time              unlimited            unlimited            seconds  

Max file size             unlimited            unlimited            bytes    

Max data size             unlimited            unlimited            bytes    

Max stack size            245760               8388608              bytes    

Max core file size        unlimited            unlimited            bytes    

Max resident set          unlimited            unlimited            bytes    

Max processes             62815                62815                processes

Max open files            500000               500000               files    

Max locked memory         65536                65536                bytes    

Max address space         unlimited            unlimited            bytes    

Max file locks            unlimited            unlimited            locks    

Max pending signals       62815                62815                signals  

Max msgqueue size         819200               819200               bytes    

Max nice priority         0                    0                   

Max realtime priority     0                    0                   

Max realtime timeout      unlimited            unlimited            us       

Any idea? Thanks.

Regards,

Igor.