[OpenSIPS-Users] Setting opensips for maximum performance

[Jan Rozhon]

Hi Bogdan,

thank you for your advice, but no help so far. I ran a test again using 
a load of 280 calls per second (2800 simultaneous calls) and watched 
receive buffer errors using netstat -su, but only 2930 errors occured 
out of almost 3 000 000 packets received. So if I understand it well, 
the problem is not caused by udp buffer size, because despite the low 
number of udp datagrams discarded more than 60 000 calls were not 
succesful (aproximately 25% of total calls).

Then I checked the database setting - I am using MySQL with "0" 
parameter (no database persistency), so I dont know how else I can make 
it run faster (I cannot use separate computer for the database).

As an opensips newbie, I dont have a clue, where the real problem could 
be, so any further help would be appreciated.

Thanks, Jan

Dne 19.2.2010 14:56, Bogdan-Andrei Iancu napsal(a):
> Hi Jan,
>
> You need to see where the bottleneck is. If it is not the CPU, it must
> be some I/O blocking opensips. For example the DB may be too slow
> blocking opesips processes ->  no process to read traffic from network ->
> traffic discarded, package lost.
>
> So, you should first look with netstat at the UDP sock, to see if the
> in-buffer is full or not (if full, the kernel will discard packages).
>
> Regarding the timeouts (for calls, for retransmissions) see the TM module:
>         http://www.opensips.org/html/docs/modules/1.6.x/tm.html#id228443
>
> Regards,
> Bogdan
>
> Jan Rozhon wrote:
>    
>> Hello,
>>
>> as a part of my diploma thesis I'm trying to do some performance testing
>> of opensips running on low cost machine with 4GB of RAM and dual-core
>> AMD Athlon processor. As a generator of SIP traffic I use SIPp v3.1
>> running on 4 virtual computers as UAC and two computers as UAS all
>> connected just by gigabit ports of a single switch. My proublem is, that
>> as soon as I reach the load of 200 calls per second (2000 simultaneous
>> calls) many of those calls (aroud 50%) don't finish succesfully. CPU
>> utilization of opensips machine is around 40% and memory around 25%, so
>> the opensips has still a lot of free resources, but it doesn't use them.
>> Could you please advise me, how to change default configuration script
>> and opensips settings to achieve better results?
>>
>> Right now, the only changes I made is :
>> -enabling registrar/proxy authentication;
>> -disabled tcp, since all the traffic is carried by udp;
>> -set shared memory to 2048 MB;
>> -set number of children to 16
>> -limit debug level to 1
>>
>> PS. How can I increase the time, after which opensips retransmits SIP
>> messages?
>>
>> Thanks in advance,
>> Jan
>>
>>
>>
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>>
>>
>>      
>
>