[Freeswitch-dev] Sound Not Ok(Choppy Sound) after 250 ports

[Steven Ayre]

That's a very hard question to answer. There's a large number of factors
that come in, not just the number of calls. CPU gets limited by what you're
doing on the calls as well as just the number of them. Things like
transcoding will increase the CPU usage per call and therefore reduce the
number of calls you can handle. The amount of CPU used will vary between
codecs. Conferencing, recording, voicemail etc too. Disk I/O might become
an issue if you're doing a lot of recording or too much logging. And there
are a number of factors about your OS that you can tune. Moving the core DB
to either a ramdisk, ODBC or PgSQL can also have an effect.

In short you need to load-test your specific use case since it may vary
from what others are doing.

Try starting here:
http://wiki.freeswitch.org/wiki/Performance_testing_and_configurations

The easier limit to calculate is network bandwidth. That's related which
codec you use and and the ptime you use (higher ptime = more fits in a
single packets, so less overhead but you lose more if packets get lost).
Try http://www.bandcalc.com/ to start with (though it doesn't list many
codecs).

If you're hearing the sound cutting in/out it could be packet loss rather
than the server if the network isn't able to keep up. Use wireshark to
capture the RTP stream and analyse it, look for packet loss or jitter.

-Steve





On 12 April 2013 07:41, Subhash <gvvsubhashkumar at gmail.com> wrote:

> Thanks,
>
> Can you please explain in detail what is that value and according to that
> how can i set the max sessions in freeswitch.How can i find the call limit
> of freeswitch on a particular OS.Do we have any formula to find the max
> call limit.
>
>
>
> Thanks,
> Subhash.
>
>
> On Wed, Apr 10, 2013 at 10:03 PM, Anthony Minessale <
> anthony.minessale at gmail.com> wrote:
>
>> Each physical setup has its own limitations.  It's relevant to the
>> hardware and software configurations on the box.
>>
>> Once you find that value for your particular machine, you can set the max
>> sessions to that number.
>>
>>
>>
>>  On Wed, Apr 10, 2013 at 2:32 AM, Subhash <gvvsubhashkumar at gmail.com>wrote:
>>
>>>  Hi,
>>> I ran the load test, raising the port count slowly (every 5 to 10
>>> minutes or so) to 100, 150, 200, 250, 275 and 300 ports.
>>>
>>> There were no audio problems until I reached 275 ports. After probably
>>> 10 minutes at 275 ports, audio problems started, and after that they were
>>> consistent.
>>> Of course I can’t guarantee that there were no audio problems at lower
>>> port counts - if the problem only occurred intermittently I might not have
>>> caught it or I might not have waited long enough.
>>>
>>> Once the audio problems started, I slowly lowered the number of ports
>>> back to 250 ports. The audio problems disappeared after about 2 1/2 minutes
>>> at 250 ports.
>>> I then increased the number of ports back to 275 ports.
>>>
>>> Thanks,
>>> Subhash.
>>>
>>> _________________________________________________________________________
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> http://www.freeswitchsolutions.com
>>>
>>> 
>>> 
>>>
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>>>
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>>>
>>
>>
>> --
>> Anthony Minessale II
>>
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>>
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>>
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>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> 
>> 
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://wiki.freeswitch.org
>> http://www.cluecon.com
>>
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>>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> 
> 
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://wiki.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-dev mailing list
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