[Freeswitch-users] High syscall percentage on Centos 7

Michael Giagnocavo mgg at giagnocavo.net
Mon Nov 30 12:51:19 MSK 2015

Without media, FS  seems to spend around 30-40% of its CPU time in malloc/free[1]. While I wouldn’t think this would directly create so many syscalls, it might be something to look at. Otherwise, start by seeing what syscalls are actually being made and go from there.


From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Sergey Safarov
Sent: Friday, 27 November, 2015 6:44
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] High syscall percentage on Centos 7

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


On Thu, Nov 26, 2015 at 11:21 AM, Denys D <dvmorte at gmail.com<mailto: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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