[Freeswitch-users] KVM vs. XEN virtualization
Stanislav Sinyagin
ssinyagin at gmail.com
Mon Apr 6 19:17:59 MSD 2015
I didn't yet have time to learn this utility - how do we interpret the
results?
On Apr 6, 2015 4:39 PM, "Errol Samuels" <ewsamuels at gmail.com> wrote:
> 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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>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> _________________________________________________________________________
>>>> >>>> Professional FreeSWITCH Consulting Services:
>>>> >>>> consulting at freeswitch.org
>>>> >>>> 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
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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
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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
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>>>>
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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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>>>
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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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>>
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
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> http://confluence.freeswitch.org
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>
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