Hello We see a high load on server with two 10 core HT processors. cat /proc/cpuinfo shows 40 processors. 1 minute load average is often grater than 70 when processing ~120 concurrent calls. CPU utilization shows 97%idle and 0.1%wa I checked also io stats and everything looks OK. Operating system Centos 7 uname -a Linux pbx-fs-drc.ib 3.10.0-229.7.2.el7.x86_64 #1 SMP Tue Jun 23 22:06:11 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Below link to pastebin with gdb output gdb /usr/local/freeswitch/bin/freeswitch /usr/local/freeswitch/log/freeswitch.gcore.2699 set pagination off thread apply all bt https://pastebin.freeswitch.org/24487 We are planning to run much more concurrent calls but do not understand these stats. Why processes are waiting in queue and we do not see any bottleneck ? Please help