[Freeswitch-users] Session recording performance

[Stanislav Sinyagin]

Yes, totally identical configs and software. And yes, the effect moves to
the other party if I change their roles.

Another hypothesis is that the calling party is sending bad RTP for some
reason. I'll collect the statistics.




On 20 Sep 2017 17:30, "Brandon Armstead" <brandon at cryy.com> wrote:

> Same kernel same everything?
>
>  Are they "exact replicas" identical?
>
> Perhaps see if you can do this test again and receive the exact system
> calls A vs B are doing and then B to A should give you further insight to
> your answer.
>
> On Wed, Sep 20, 2017 at 6:46 AM Stanislav Sinyagin <ssinyagin at gmail.com>
> wrote:
>
>> I'm building an environment for voice quality testing, and found a
>> strange behavior. Maybe someone has an explanation.
>>
>> Two identical physical computers (PC Engines APU2), connected back to
>> back (A and B).
>>
>> A initiates the test calls to B's SIP address, and then both ends go
>> through a small dialplan (less than 100 lines of XML, similar to
>> https://github.com/voxserv/fsqa/blob/master/fsqa.xml
>> and start recording the session.
>>
>> The dialplan initiates session recording to a Raw file, and plays back
>> a 20-second audio sample, and then inserts the filename into a Redis
>> queue, then hangs up. Then the files get processed by Sevana AQuA
>> software in lowest CPU priority, and deleted. The files are written
>> into a tmpfs filesystem.
>>
>> With 2 calls per second, I get 48 simultaneous calls, and B indicates
>> frame drops in the audio recordings, while A shows good results. The
>> CPU average idle time is always above 50% on both computers.
>>
>> Why is the B side (the one receiving INVITEs) getting more frame drops
>> than the A (the one originating the calls)?  I flipped the sides, and
>> then the other machine started to get more drops.
>>
>> At first I started recording in WAV format, and similar effect started
>> to appear at a call every 2 seconds, resulting in 12 simultaneous
>> calls. With raw recording, the performance is much better, but still
>> it's a mistery why there are dropped frames in the audio.
>>
>> The CPU is always running at its highest frequency, under
>> "performance" governor.
>>
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