On Apr 6, 2015 4:39 PM, "Errol Samuels" <ewsamuels@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@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@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@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@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@gmail.com> wrote:
> On Sat, Apr 4, 2015 at 1:03 PM, Regis M <regis.freeswitch.org@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@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@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@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@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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>>>>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>> http://www.freeswitch.org
>>>>
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
>>>> consulting@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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>>> Professional FreeSWITCH Consulting Services:
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>>> http://www.freeswitchsolutions.com
>>>
>>> Official FreeSWITCH Sites
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>>
>>
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting@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:
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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://www.freeswitch.org

_________________________________________________________________________
Professional FreeSWITCH Consulting Services:
consulting@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@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@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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_________________________________________________________________________
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consulting@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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