[Freeswitch-users] High syscall percentage on Centos 7

[Denys D]

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 at 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 at 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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>
>
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