[Freeswitch-users] Audio quality issues

[Michael Jerris]

I wouldn't be shocked if the virtual nic's are bottlenecking on pps.  I've seen this before.  Also possible you have a crap physical nic.  What kind of nic is it and what virtualization technology?

On Oct 22, 2013, at 6:01 AM, Grant Bagdasarian <GB at cm.nl> wrote:

> The network shouldn’t be an issue, since we have at least 1Gbps lines. The tests stay within the network.
>  
> I forgot to mention the calls are being distributed across two machines by a Kamailio instance.
> So for a total of 800 concurrent calls generated by Sipp, each machine has 400 active calls.
> CPU load reaches about 70% per machine.
>  
> At this point both FS machines are virtualized, since the performance gain wasn’t that much compared to physical.
> The VM host shows it is using ~3/4 of its CPU resources.
>  
> Htop shows that the normal priority threads(green) and the kernel threads(red) are about the same length.
>  
> Also, FS is running on Ubuntu Server 12.04 x64.
>  
> From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Stanislav Sinyagin
> Sent: Tuesday, October 22, 2013 11:11 AM
> To: FreeSWITCH Users Help
> Subject: Re: [Freeswitch-users] Audio quality issues
>  
> 800 calls at 64kbps is 51Mbps. 
> Could there be a network issue, like a 100Mbps line between the endpoints?
> 
> How heavy is your CPU load?  "htop" command would be helpful in this.
> 
> 
>  
>  
> From: Grant Bagdasarian <GB at cm.nl>
> To: "FreeSWITCH Users Help (freeswitch-users at lists.freeswitch.org)" <freeswitch-users at lists.freeswitch.org> 
> Sent: Tuesday, October 22, 2013 10:14 AM
> Subject: [Freeswitch-users] Audio quality issues
>  
> Hello,
>  
> I was wondering what the maximum concurrent calls for FS before audio quality becomes an issue? I assume the specs of the machine would also affect this.
> We are currently running FS on a Six Core (12 Threads) Intel E5-2430 CPU and get about 800 concurrent calls at 10-20 CPS. The audio quality at these rates is still fair, but we do notice some quality issue’s.
> Going above these numbers screws up the audio quality: choppy sound, audio drops etc. We aren’t doing any heavy media processing, just simply playing a file (G711-Alaw) which lasts about 2 minutes during the load test.
> These numbers are for one way audio, where Sipp doesn’t echo the RTP back. These numbers get lower once Sipp echo’s the RTP.
>  
> I’ve tried FS on a physical box and also on a virtual box (ESXi 5.1), but the performance gain on physical vs virtual isn’t that much.
>  
> I disabled all the modules we don’t need, like CDR’s, conferencing, etc.
>  
> Are there any parameters(config files)/modules that can affect the quality of the audio stream?
>  
> Regards,
>  
> Grant
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