[Freeswitch-users] KVM vs. XEN virtualization

Tue Apr 7 23:22:19 MSD 2015

Price aside... we have no issues so far with Amazon. Carlos.

2015-04-05 19:22 GMT-04:30 Carlos Ruiz Díaz <carlos.ruizdiaz at gmail.com>:

> 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:
>>>>>> >>>>> 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
>>>>>> >>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>> >>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> >>>>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> >>>>> http://www.freeswitch.org
>>>>>> >>>>
>>>>>> >>>>
>>>>>> >>>>
>>>>>> >>>>
>>>>>> _________________________________________________________________________
>>>>>> >>>> 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
>>>>>> >>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>> >>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> >>>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> >>>> http://www.freeswitch.org
>>>>>> >>>
>>>>>> >>>
>>>>>> >>>
>>>>>> _________________________________________________________________________
>>>>>> >>> 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
>>>>>> >>> FreeSWITCH-users at lists.freeswitch.org
>>>>>> >>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> >>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> >>> http://www.freeswitch.org
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> _________________________________________________________________________
>>>>>> >> 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
>>>>>> >> FreeSWITCH-users at lists.freeswitch.org
>>>>>> >> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> >> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> >> http://www.freeswitch.org
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> 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
>>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> http://www.freeswitch.org
>>>>>>
>>>>>
>>>>>
>>>>
>>>> --
>>>>
>>>> *Brian West*
>>>> brian at freeswitch.org
>>>>
>>>>
>>>> *Twitter: @FreeSWITCH , @briankwest*
>>>> http://www.freeswitchbook.com
>>>> http://www.freeswitchcookbook.com
>>>>
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>>>>
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>>>> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> 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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>>>>
>>>
>>
>> _________________________________________________________________________
>> 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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>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>>
>
>
>
> --
> Carlos
> http://caruizdiaz.com
>
> _________________________________________________________________________
> 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
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>

-- 

Víctor E. Medina M.
Platform Architect / Chief Infrastructure
+58424 291 4561
BB #79A8AFA2
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