[Freeswitch-users] KVM vs. XEN virtualization

Mon Apr 6 16:40:09 MSD 2015

Stanislav,

If you have a spare box around you could install Proxmox on it since that
uses KVM and works great too.

regards,

Errol

On Mon, Apr 6, 2015 at 9:40 AM, Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> I'm using the smallest $5 machines at DO in Amsterdam and London, and
> Xen is on my colocated physical machine in Zurich.
>
> I'm still collecting the statistics. It's all started when I had my
> call generator at DO, and I noticed regular slipping frames on the
> receiving side. The calls were definitely going through TDM links,
> because I know the receiving side.
>
> I'm still testing it. Sometimes I get slipping frames from the Xen
> calls, but never such regular slips as I got with DO. Sometimes on a
> DO host, the calls run quite fine, but those were on a weekend in the
> middle of the night. I'll continue testing during the week.
>
> What would be good, is to have a KVM machine where the physical host
> is controlled, so that we can see its overall CPU load during the
> tests.
>
>
>
> On Mon, Apr 6, 2015 at 10:15 AM, Errol Samuels <ewsamuels at gmail.com>
> wrote:
> > Good job and Thanks for sharing!
> >
> >> KVM at digitalocean.com, Debian 7 64bit, FreeSWITCH 1.4.15: bad
> precision
> >
> >
> > As someone who has been using KVM for a few years and has just migrated
> > about 20 VMs across to Digital Ocean about 6 weeks ago I admit I am a
> little
> > concerned about this finding.
> >
> > Just out of curiosity can you tell me the specs of the VM that you tested
> > with and which DO Datacenter?  I am using NYC3 so perhaps and I will do
> some
> > tests as soon as I have some time.
> >
> > With regards to Xen was this at Linode or inhouse?
> >
> > Thanks
> >
> > Errol
> >
> >
> >
> > On Sun, Apr 5, 2015 at 1:37 AM, Stanislav Sinyagin <ssinyagin at gmail.com>
> > wrote:
> >>
> >> 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
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>>
> _________________________________________________________________________
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> >> >>>>> http://www.freeswitchsolutions.com
> >> >>>>>
> >> >>>>> Official FreeSWITCH Sites
> >> >>>>> http://www.freeswitch.org
> >> >>>>> http://confluence.freeswitch.org
> >> >>>>> http://www.cluecon.com
> >> >>>>>
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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
> >> >>>
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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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> >>
> _________________________________________________________________________
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> >> consulting at freeswitch.org
> >> http://www.freeswitchsolutions.com
> >>
> >> Official FreeSWITCH Sites
> >> http://www.freeswitch.org
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> >> http://www.cluecon.com
> >>
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> >
> >
> > _________________________________________________________________________
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> > http://www.freeswitchsolutions.com
> >
> > Official FreeSWITCH Sites
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> > http://www.cluecon.com
> >
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> _________________________________________________________________________
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>
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