[Freeswitch-users] KVM vs. XEN virtualization

Sergey Safarov s.safarov at gmail.com
Mon Apr 6 19:34:41 MSD 2015 

Errol

We can seen in the test results that the digitalocean virtual machine has
maximum timer interrupt latency  is about 40 ms (42890 us). This means that
FS will not receives  (or will not sends) at time some voip packets for 30
seconds (test time). How mach you can see if you add key "-v"

date && /tmp/rt-tests/cyclictest -t1 -p 80 -d 0 -n -i 125 -l 240000 -v &&
date

On Mon, Apr 6, 2015 at 5:38 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
>>>> >>>>>
>>>> >>>>>
>>>> >>>>>
>>>> _________________________________________________________________________
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>>>> >>>>>
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>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> >>>>
>>>> _________________________________________________________________________
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>>>> >>>>
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>>>> >>>
>>>> >>>
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>>>> >>>
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>>>> >>
>>>> >>
>>>> >>
>>>> >>
>>>> _________________________________________________________________________
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>>>> >> http://www.freeswitchsolutions.com
>>>> >>
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>>>>
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>>>> http://www.freeswitchsolutions.com
>>>>
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>>>
>>>
>>> _________________________________________________________________________
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>>>
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>>
>>
>> _________________________________________________________________________
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>> http://www.freeswitchsolutions.com
>>
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>>
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>
>
> _________________________________________________________________________
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>
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