[Freeswitch-users] KVM vs. XEN virtualization

[Carlos Ruiz Díaz]

This makes me wonder whether to stick with DO or migrate to Amazon.

Any advice on EC2 quality compared to DO?

On Sun, Apr 5, 2015 at 5:33 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> I made additional tests by sending calls to sipgate.co.uk, and they
> confirm my results: when sending a call from my Xen server in Switzerland,
> the received audio is always perfect. But when sending from a Digitalocean
> host in Amsterdam, I get the slipping frames.
>
> I will re-test again during a business day, when the servers are likely to
> be more busy.
>
>
>
> On Sun, Apr 5, 2015 at 12:47 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
> wrote:
>
>> Yrs, jitter buffer was enabled. Here I'm pretty sure that we deal with
>> the clock skew.
>> On Apr 5, 2015 12:07 PM, "Brian West" <brian at freeswitch.org> wrote:
>>
>>> Correct me if I'm wrong but is sounds like you've described jitter.  Did
>>> you test with the jitter buffer enabled?
>>>
>>> On Sunday, April 5, 2015, Regis M <regis.freeswitch.org at tornad.net>
>>> wrote:
>>>
>>>> nice work !!!  Thanks for sharing.
>>>>
>>>>
>>>>
>>>> 2015-04-05 2:37 GMT+02:00 Stanislav Sinyagin <ssinyagin at gmail.com>:
>>>>
>>>>> here we go:
>>>>>
>>>>> https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/
>>>>>
>>>>>
>>>>>
>>>>> On Sat, Apr 4, 2015 at 4:26 PM, Stanislav Sinyagin <
>>>>> ssinyagin at gmail.com> wrote:
>>>>> > On Sat, Apr 4, 2015 at 1:03 PM, Regis M <
>>>>> regis.freeswitch.org at tornad.net> wrote:
>>>>> >> How do you check wavs together in audacity ?
>>>>> >
>>>>> > you just open two WAV files, align their starting position, and
>>>>> > visually check the waves. If there's a problem, you would see that
>>>>> > after few seconds, the waves are not aligned any more.
>>>>> >
>>>>> >> Can you send me 2 samples wav (send... and recorded) so I could see
>>>>> the 20ms
>>>>> >> diff that you exposed...
>>>>> >>
>>>>> >> Is there a way to automate the result checking, so it could help to
>>>>> monitor
>>>>> >> itsp quality
>>>>> >
>>>>> > Here
>>>>> > https://github.com/openpreserve/scape-xcorrsound/issues/17
>>>>> > this is a link to a tool which compares two sound files at the wave
>>>>> > level. You can also see the sound samples in the ticket.
>>>>> > The problem is, that currently this tool does not detect such
>>>>> slipping frames.
>>>>> >
>>>>> > I will also write a detailed article with examples, during the
>>>>> weekend.
>>>>> >
>>>>> >
>>>>> >
>>>>> >
>>>>> >
>>>>> >>
>>>>> >>
>>>>> >> 2015-04-04 12:53 GMT+02:00 Stanislav Sinyagin <ssinyagin at gmail.com
>>>>> >:
>>>>> >>>
>>>>> >>> Important is to send the media through two independent carriers -
>>>>> then you
>>>>> >>> can be sure that your clock is compared against a high quality one.
>>>>> >>>
>>>>> >>> On Apr 4, 2015 12:46 PM, "Regis M" <
>>>>> regis.freeswitch.org at tornad.net>
>>>>> >>> wrote:
>>>>> >>>>
>>>>> >>>> Hi,
>>>>> >>>>
>>>>> >>>> It's a very interresting test and conclusion.
>>>>> >>>>
>>>>> >>>> I will try to build a similar environnement on my freeswitch to
>>>>> check
>>>>> >>>> some system :)
>>>>> >>>>
>>>>> >>>> thanks
>>>>> >>>>
>>>>> >>>>
>>>>> >>>>
>>>>> >>>> 2015-04-04 2:16 GMT+02:00 Stanislav Sinyagin <ssinyagin at gmail.com
>>>>> >:
>>>>> >>>>>
>>>>> >>>>> hi,
>>>>> >>>>>
>>>>> >>>>> Here are some test results which might be interesting:
>>>>> >>>>>
>>>>> >>>>> I've set up a test FreeSWITCH server at digitalocean (they use
>>>>> KVM),
>>>>> >>>>> and originated test calls to some ITSP accounts. Each call
>>>>> played a
>>>>> >>>>> test sound file (voice samples from ITU:
>>>>> >>>>>
>>>>> http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050
>>>>> >>>>> ), and on the receiving end another FreeSWITCH server was
>>>>> recording
>>>>> >>>>> the received session. The receiving server was on a XEN VM. Both
>>>>> >>>>> servers talked G711 to their corresponding ITSP accounts.
>>>>> >>>>>
>>>>> >>>>> Then I compared the source audio and received audio in Audacity
>>>>> editor.
>>>>> >>>>>
>>>>> >>>>> The tests showed that the received voice wave shifts 20ms from
>>>>> the
>>>>> >>>>> original sound every few seconds, randomly back and forward. This
>>>>> >>>>> skewing was always present, regardless of ITSP and time of day.
>>>>> >>>>>
>>>>> >>>>> Then I moved the sending server to a XEN VM, and the waves
>>>>> appeared
>>>>> >>>>> almost perfectly synchronized (there was a 5ms skew in one test,
>>>>> and I
>>>>> >>>>> guess it's related to transcoding buffer, as the sound was
>>>>> obviously
>>>>> >>>>> transcoded).
>>>>> >>>>>
>>>>> >>>>> The effect was always visible with a 30-second sample, and I
>>>>> also made
>>>>> >>>>> additional tests with 2-minute samples.
>>>>> >>>>>
>>>>> >>>>> It would also be interesting to test this from a VmWare VM. If
>>>>> someone
>>>>> >>>>> wants to run such a test, feel free to contact me directly.
>>>>> >>>>>
>>>>> >>>>>
>>>>> >>>>> cheers,
>>>>> >>>>> stan
>>>>> >>>>>
>>>>> >>>>>
>>>>> >>>>>
>>>>> _________________________________________________________________________
>>>>> >>>>> Professional FreeSWITCH Consulting Services:
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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
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>>>>> >>>>
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>>>>> >>>
>>>>> >>>
>>>>> >>>
>>>>> _________________________________________________________________________
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>>>>> >>> http://www.freeswitchsolutions.com
>>>>> >>>
>>>>> >>> Official FreeSWITCH Sites
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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://confluence.freeswitch.org
>>>>> >> http://www.cluecon.com
>>>>> >>
>>>>> >> FreeSWITCH-users mailing list
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>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> Official FreeSWITCH Sites
>>>>> http://www.freeswitch.org
>>>>> http://confluence.freeswitch.org
>>>>> http://www.cluecon.com
>>>>>
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>>>>>
>>>>
>>>>
>>>
>>> --
>>>
>>> *Brian West*
>>> brian at freeswitch.org
>>>
>>>
>>> *Twitter: @FreeSWITCH , @briankwest*
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>>>
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>>>
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>>>
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>>
>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
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>
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-- 
Carlos
http://caruizdiaz.com
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