[Freeswitch-users] Session recording performance

[Stanislav Sinyagin]

RTP flows seem to be ok so far. Also using mod_native_file did not
help the situation, although it improved the performance.



On Wed, Sep 20, 2017 at 5:53 PM, Stanislav Sinyagin <ssinyagin at gmail.com> wrote:
> 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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>>
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>>
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