[Freeswitch-users] High syscall percentage on Centos 7

[William King]

What are the hardware specs for your test? and which specific kernel
were you testing against? Was the testing instance using bare metal, or
virtualized?

William King
Senior Engineer
Quentus Technologies, INC
1037 NE 65th St Suite 273
Seattle, WA 98115
Main:   (877) 211-9337
Office: (206) 388-4772
Cell:   (253) 686-5518
william.king at quentustech.com

On 12/4/15 8:20 AM, Denys D wrote:
> 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
> <mailto: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
>     <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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