[Freeswitch-users] KVM vs. XEN virtualization

Tue Apr 7 06:38:45 MSD 2015

Sergey,
Why you suggest to use exactly this numbers in cyclictest's switches?
And how in your opinion this numbers are related to Freeswitch in VM
environment?

P.S.
https://mindlinux.wordpress.com/2013/10/25/using-and-understanding-the-real-time-cyclictest-benchmark-frank-rowand-sony/

2015-04-06 15:27 GMT+03:00 Sergey Safarov <s.safarov at gmail.com>:

> Errol can you test VM timer with utility
> https://rt.wiki.kernel.org/index.php/Cyclictest
>
> My VM currently have folowing results
>
> [root at fs1 ~]#  date && /tmp/rt-tests/cyclictest -t42 -p 80 -d 0 -n -i 125 -l 240000 && date
> Sun Apr  5 07:01:31 GMT 2015
> # /dev/cpu_dma_latency set to 0us
> policy: fifo: loadavg: 2.38 0.93 0.50 1/194 1574
>
> T: 0 ( 1531) P:80 I:125 C: 240000 Min:      2 Act:   12 Avg:   16 Max:    1302
> T: 1 ( 1532) P:80 I:125 C: 240000 Min:      2 Act:   15 Avg:   14 Max:    2895
> T: 2 ( 1533) P:80 I:125 C: 240000 Min:      3 Act:   10 Avg:   12 Max:    2888
> T: 3 ( 1534) P:80 I:125 C: 240000 Min:      1 Act:   16 Avg:   13 Max:    1333
> T: 4 ( 1535) P:80 I:125 C: 240000 Min:      2 Act:   20 Avg:   14 Max:    2962
> T: 5 ( 1536) P:80 I:125 C: 240000 Min:      1 Act:   12 Avg:   14 Max:    2946
> T: 6 ( 1537) P:80 I:125 C: 240000 Min:      2 Act:   10 Avg:   13 Max:    1363
> T: 7 ( 1538) P:80 I:125 C: 240000 Min:      2 Act:   12 Avg:   13 Max:    1344
> T: 8 ( 1539) P:80 I:125 C: 240000 Min:      3 Act:   12 Avg:   16 Max:    1408
> T: 9 ( 1540) P:80 I:125 C: 240000 Min:      1 Act:    8 Avg:   13 Max:    2882
> T:10 ( 1541) P:80 I:125 C: 239974 Min:      2 Act:   12 Avg:   13 Max:    2908
>
>
> On Mon, Apr 6, 2015 at 11:15 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
>>> >>>>>
>>> >>>>>
>>> >>>>>
>>> _________________________________________________________________________
>>> >>>>> 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:
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>>> >>>>> 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
>>> >>>>
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>>> >>>
>>> >>>
>>> >>>
>>> _________________________________________________________________________
>>> >>> Professional FreeSWITCH Consulting Services:
>>> >>> 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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>>> >>
>>> >>
>>> >>
>>> >>
>>> _________________________________________________________________________
>>> >> 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
>>> 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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>>
>
>
> _________________________________________________________________________
> 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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