[Freeswitch-users] Session recording performance

[Brandon Armstead]

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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