[Freeswitch-users] KVM vs. XEN virtualization

Brian West brian at freeswitch.org
Tue Apr 7 23:54:27 MSD 2015 

Do you happen to do faxing on EC2?  Also what distro do you run on your
instances?

On Tue, Apr 7, 2015 at 2:22 PM, Victor Medina <victor.medina at cibersys.com>
wrote:

> 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
>>>>>
>>>>> ClueCon 2015 Call for Speakers
>>>>> <https://www.cluecon.com/call-for-speakers/> | Register
>>>>> <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit: /r/freeswitch
>>>>> <https://www.reddit.com/r/freeswitch>
>>>>>
>>>>> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
>>>>> *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
>>>>>
>>>>> 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
>>>
>>
>>
>>
>> --
>> 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
> @VMCibersys
>
>
> _________________________________________________________________________
> 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

ClueCon 2015 Call for Speakers <https://www.cluecon.com/call-for-speakers/> |
Register <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit:
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*T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
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