We made couple of synthetic tests with sipp uac scenario (unfortunately we cannot move the current load from the production to the test environment right now) - 300 cps, 1500 calls limi;, ulimits for FS set as recommended, same dialplan :

Debian 8.2 + FS 1.2.24 - up to 95% CPU utilization with ~65% syscalls
Debian 8.2 + FS 1.6.5 - up to 95% CPU utilization with ~65% syscalls

Centos 5.11 + FS 1.2.23 - up to 85% CPU utilization with ~20% syscalls
Centos 6.7 + FS 1.6.5 - up to 97% CPU utilization with ~67% syscalls

Centos 7.1 + FS 1.6.5 - up to 97% CPU utilization with ~67% syscalls
Centos 7.1 + FS 1.2.24 - up to97% CPU utilization with ~67% syscalls

FreeBSD 10.2 + FS 1.6.5 - up to 80% CPU utilization with ~20% syscalls

So, it seems that we've something missed when configuring FS on modern Linux distributives.

On Fri, Nov 27, 2015 at 2:44 PM, Sergey Safarov <s.safarov@gmail.com> wrote:

Could you build and test FS 1.2.23 on CentOS 7.
Probably it can help to locate problem on OS or FS.

Sergey

On Thu, Nov 26, 2015 at 11:21 AM, Denys D <dvmorte@gmail.com> wrote:
Hi! Has anybody faced with high system calls on Centos 7 while running FreeSwitch?
We have migrated from FS 1.2.23 on Centos 5.11 to FS 1.6.2 on Centos 7 and faced with very high syscall (up to 60% CPU time) rate under moderate load (300 CPS, 1500 simultaneous calls). We also faced the same issue on Centos 6.7 and Debian 8.2 with FS 1.6.2 on the same hardware. On Centos 5.11 with the same load and h/w we had no more than 10% syscalls CPU time. We have already tried nohz=off kernel option and it didn't solve the problem. What should we change in our environment to achieve the same performance level as it was on Centos 5.11?

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