[Freeswitch-users] Audio quality issues

[Miha]

Hi Steve,

do you have any good preposal which switch has good performance for voip 
trafic?

miha

Dne 10/22/2013 3:32 PM, piše Steve Underwood:
> Hi Grant,
>
> Two possibilities spring to mind:
>
> - If your audio is coming from a disk, can that disk keep up?
> - How good is your ethernet switch?
>
> Notice in the second point I said how good, not how expensive. Many
> switches choke on a large number of small media packets, including some
> expensive big name products.
>
> Regards,
> Steve
>
> On 10/22/2013 06:01 PM, 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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