[Freeswitch-users] Tuning Up Freeswitch

[Ariel Monaco]

We had high CPU utilization peaks in the past, which lead to some audio issues (clipping). We were using debian at that time, which was a customer-side requirement.

I'm not a kernel guru but I remember this had something to do with kernel timer cycles and the issue was address by adding "divider=10" or "divider=100" as a kernel's boot loader option.

My 2 cents,
Ariel

On Apr 21, 2011, at 13:24 , Antonio Teixeira wrote:

> Hello List.
> 
> I'm currently integrating an IVR in python together with freeswitch using mod_python and ESL and my life has been well until ...
> The flow of calls went over 80 simultaneous calls.
> Now freeswitch starts sending packets with huge delays ( even when establishing the call , mainly the 200 ) and firing up the IVR with tons of delay up to 20 seconds.
> 
> So i searched the wiki forums and mailing list:
> 
> Put freeswitch on a diet , trimmed modules.conf
> Played with the ulimit stuff.
> Played with the IVRS to reduce load to a minimum and i was able to squeeze more 5 calls of performance.
> 
> The problem is :
> 
> Top shows 
> top - 16:14:33 up 35 days,  8:15,  3 users,  load average: 1.92, 1.76, 1.78
> Tasks: 133 total,   1 running, 132 sleeping,   0 stopped,   0 zombie
> Cpu(s):  1.4%us,  3.3%sy,  0.0%ni, 94.6%id,  0.0%wa,  0.3%hi,  0.5%si,  0.0%st
> Mem:   8193336k total,  1639156k used,  6554180k free,   177208k buffers
> Swap: 19534904k total,        0k used, 19534904k free,  1062272k cached
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                         
> 31361 yadayada      20   0  716m 164m 9628 S   73  2.1 155:17.85 freeswitch   
> 
> Freeswitch goes up to 150 % and puff there goes the MOS down to 0.
> 
> 
> Some basic System Info :
> Debian 6.0 ( i heard the timming module is affected by Debian , but if the CPU % gets lower than 95% everything will be more stable)
> Python 2.5
> 
> 2 x Intel(R) Xeon(R) CPU           E5506  @ 2.13GHz
> 8 GB of Ram
> 
> as you can see 94 % of the "Cpu Power" is sleeping :\
> 
> 
> It appears freeswitch is only capable of using let's say "one cpu"/thread ??
> Do you guys recommend simply starting more instances or redoing the IVR stuff.
> 
> 
> Hope you guys can help me out.
> 
> Thanks
> António Teixeira
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Ariel Monaco – Systems Engineer
Flylabs - Open Source Telecommunications and  IT Consultants

Address: Potosí 4456 C1199ACP - Buenos Aires - Argentina
Web: http://flylabs.com
E-Mail: arielmonaco at flylabs.com
Tel. +54 (11) 4982-2689, +1 (315) 688-7333