[Freeswitch-users] KVM vs. XEN virtualization
Errol Samuels
ewsamuels at gmail.com
Mon Apr 6 18:38:28 MSD 2015
Ok Sergey,
Here it goes:
Test 1
====
*VM: *Digital Ocean KVM at AMS3 / 2 Cores / 2GB Ram / 40GB SSD
*OS:* Debian Wheezy 7.8 64 bit / Linux 3.2.0-4-amd64 x86_64
policy: fifo: loadavg: 6.22 1.53 0.58 1/164 31050 : 195 Max:
42869
T:12 (31021) P:80 I:125 C: 238830 Min: 2 Act: 18 Avg: 196 Max:
42846
T: 0 (31009) P:80 I:125 C: 239000 Min: 2 Act: 12 Avg: 190 Max:
42845
T: 1 (31010) P:80 I:125 C: 239002 Min: 2 Act: 18 Avg: 196 Max:
42866
T: 2 (31011) P:80 I:125 C: 239004 Min: 3 Act: 10 Avg: 191 Max:
42890
T: 3 (31012) P:80 I:125 C: 239004 Min: 3 Act: 8 Avg: 197 Max:
42876
T: 4 (31013) P:80 I:125 C: 239005 Min: 2 Act: 27 Avg: 194 Max:
42846
T: 5 (31014) P:80 I:125 C: 239008 Min: 2 Act: 26 Avg: 196 Max:
42872
T: 6 (31015) P:80 I:125 C: 239013 Min: 2 Act: 12 Avg: 196 Max:
42843
T: 7 (31016) P:80 I:125 C: 239013 Min: 2 Act: 19 Avg: 194 Max:
42848
T: 8 (31017) P:80 I:125 C: 239013 Min: 2 Act: 14 Avg: 190 Max:
42856
T: 9 (31018) P:80 I:125 C: 239014 Min: 2 Act: 14 Avg: 197 Max:
42865
T:10 (31019) P:80 I:125 C: 239016 Min: 2 Act: 9 Avg: 197 Max:
42868
Test 2
====
*VM: *Linode (Xen) London / 8 Cores (E5-2670 0 @ 2.60GHz) / 4GB Ram
*OS:* Ubuntu 12.04.4 LTS / Linux 3.18.5-x86_64-linode52 x86_64
policy: fifo: loadavg: 6.50 1.56 0.55 15/246 30752 97 Max:
1030
T:16 (30726) P:80 I:125 C: 239853 Min: 5 Act: 77 Avg: 97 Max:
1066
T: 0 (30710) P:80 I:125 C: 239946 Min: 5 Act: 63 Avg: 98 Max:
1245
T: 1 (30711) P:80 I:125 C: 239946 Min: 5 Act: 67 Avg: 98 Max:
1091
T: 2 (30712) P:80 I:125 C: 239945 Min: 5 Act: 119 Avg: 97 Max:
1351
T: 3 (30713) P:80 I:125 C: 239945 Min: 5 Act: 99 Avg: 98 Max:
932
T: 4 (30714) P:80 I:125 C: 239945 Min: 5 Act: 35 Avg: 98 Max:
1413
T: 5 (30715) P:80 I:125 C: 239945 Min: 5 Act: 35 Avg: 98 Max:
1407
T: 6 (30716) P:80 I:125 C: 239944 Min: 5 Act: 110 Avg: 97 Max:
1173
T: 7 (30717) P:80 I:125 C: 239947 Min: 5 Act: 85 Avg: 99 Max:
1144
T: 8 (30718) P:80 I:125 C: 239948 Min: 4 Act: 69 Avg: 99 Max:
916
T: 9 (30719) P:80 I:125 C: 239947 Min: 4 Act: 40 Avg: 97 Max:
916
T:10 (30720) P:80 I:125 C: 239948 Min: 5 Act: 61 Avg: 97 Max:
1024
T:11 (30721) P:80 I:125 C: 239946 Min: 6 Act: 84 Avg: 98 Max:
2082
T:12 (30722) P:80 I:125 C: 239947 Min: 4 Act: 40 Avg: 98 Max:
2142
T:13 (30723) P:80 I:125 C: 239946 Min: 5 Act: 49 Avg: 98 Max:
1986
T:14 (30724) P:80 I:125 C: 239946 Min: 4 Act: 113 Avg: 99 Max:
2061
This is with system defaults.
regards,
Errol
On Mon, Apr 6, 2015 at 1:27 PM, Sergey Safarov <s.safarov at gmail.com> wrote:
> 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
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>>> >>>>> 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
>>> >>>>
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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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>>>
>>> _________________________________________________________________________
>>> 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
>> 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
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> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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