[Freeswitch-users] Audio quality issues

[I put the Who? in Mishehu]

Your network may be rated for 1 gbps, but that may assume packets at or 
near the MTU size, and that MTU used in the rating might be around 9000 
bytes.  RTP packets are typically around 200 or less bytes each, sent 
every ptime (default is 20ms).  You may saturate your network 
infrastructure long before you saturate your FreeSWITCH.

-Yossi


On 10/22/2013 05:01 AM, Grant Bagdasarian 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 <mailto:GB at cm.nl>>
> *To:* "FreeSWITCH Users Help (freeswitch-users at lists.freeswitch.org 
> <mailto:freeswitch-users at lists.freeswitch.org>)" 
> <freeswitch-users at lists.freeswitch.org 
> <mailto: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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