<div dir="ltr">Errol <br><div><br></div><div><div>We can seen in the test results that the digitalocean virtual machine has maximum timer interrupt latency is about 40 ms (<span style="font-size:12.8000001907349px">42890</span> 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"</div><div><br></div><div>date && /tmp/rt-tests/cyclictest -t1 -p 80 -d 0 -n -i 125 -l 240000 -v && date</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 6, 2015 at 5:38 PM, Errol Samuels <span dir="ltr"><<a href="mailto:ewsamuels@gmail.com" target="_blank">ewsamuels@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Ok Sergey,<br><br></div>Here it goes:<br><br></div><div>Test 1<br>====<br></div><b>VM: </b>Digital Ocean KVM at AMS3 / 2 Cores / 2GB Ram / 40GB SSD<br></div><b>OS:</b> Debian Wheezy 7.8 64 bit / Linux 3.2.0-4-amd64 x86_64 <br><div><div><br>policy: fifo: loadavg: 6.22 1.53 0.58 1/164 31050 : 195 Max: 42869<br>T:12 (31021) P:80 I:125 C: 238830 Min: 2 Act: 18 Avg: 196 Max: 42846<br>T: 0 (31009) P:80 I:125 C: 239000 Min: 2 Act: 12 Avg: 190 Max: 42845<br>T: 1 (31010) P:80 I:125 C: 239002 Min: 2 Act: 18 Avg: 196 Max: 42866<br>T: 2 (31011) P:80 I:125 C: 239004 Min: 3 Act: 10 Avg: 191 Max: 42890<br>T: 3 (31012) P:80 I:125 C: 239004 Min: 3 Act: 8 Avg: 197 Max: 42876<br>T: 4 (31013) P:80 I:125 C: 239005 Min: 2 Act: 27 Avg: 194 Max: 42846<br>T: 5 (31014) P:80 I:125 C: 239008 Min: 2 Act: 26 Avg: 196 Max: 42872<br>T: 6 (31015) P:80 I:125 C: 239013 Min: 2 Act: 12 Avg: 196 Max: 42843<br>T: 7 (31016) P:80 I:125 C: 239013 Min: 2 Act: 19 Avg: 194 Max: 42848<br>T: 8 (31017) P:80 I:125 C: 239013 Min: 2 Act: 14 Avg: 190 Max: 42856<br>T: 9 (31018) P:80 I:125 C: 239014 Min: 2 Act: 14 Avg: 197 Max: 42865<br>T:10 (31019) P:80 I:125 C: 239016 Min: 2 Act: 9 Avg: 197 Max: 42868<br><br><br></div><div>Test 2<br>====<br><b>VM: </b>Linode (Xen) London / 8 Cores (E5-2670 0 @ 2.60GHz) / 4GB Ram<br><b>OS:</b> Ubuntu 12.04.4 LTS / Linux 3.18.5-x86_64-linode52 x86_64<br><br>policy: fifo: loadavg: 6.50 1.56 0.55 15/246 30752 97 Max: 1030<br>T:16 (30726) P:80 I:125 C: 239853 Min: 5 Act: 77 Avg: 97 Max: 1066<br>T: 0 (30710) P:80 I:125 C: 239946 Min: 5 Act: 63 Avg: 98 Max: 1245<br>T: 1 (30711) P:80 I:125 C: 239946 Min: 5 Act: 67 Avg: 98 Max: 1091<br>T: 2 (30712) P:80 I:125 C: 239945 Min: 5 Act: 119 Avg: 97 Max: 1351<br>T: 3 (30713) P:80 I:125 C: 239945 Min: 5 Act: 99 Avg: 98 Max: 932<br>T: 4 (30714) P:80 I:125 C: 239945 Min: 5 Act: 35 Avg: 98 Max: 1413<br>T: 5 (30715) P:80 I:125 C: 239945 Min: 5 Act: 35 Avg: 98 Max: 1407<br>T: 6 (30716) P:80 I:125 C: 239944 Min: 5 Act: 110 Avg: 97 Max: 1173<br>T: 7 (30717) P:80 I:125 C: 239947 Min: 5 Act: 85 Avg: 99 Max: 1144<br>T: 8 (30718) P:80 I:125 C: 239948 Min: 4 Act: 69 Avg: 99 Max: 916<br>T: 9 (30719) P:80 I:125 C: 239947 Min: 4 Act: 40 Avg: 97 Max: 916<br>T:10 (30720) P:80 I:125 C: 239948 Min: 5 Act: 61 Avg: 97 Max: 1024<br>T:11 (30721) P:80 I:125 C: 239946 Min: 6 Act: 84 Avg: 98 Max: 2082<br>T:12 (30722) P:80 I:125 C: 239947 Min: 4 Act: 40 Avg: 98 Max: 2142<br>T:13 (30723) P:80 I:125 C: 239946 Min: 5 Act: 49 Avg: 98 Max: 1986<br>T:14 (30724) P:80 I:125 C: 239946 Min: 4 Act: 113 Avg: 99 Max: 2061<br><br></div><div>This is with system defaults.<br><br></div><div>regards,<br><br></div><div>Errol<br><br></div><div><br><br></div></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 6, 2015 at 1:27 PM, Sergey Safarov <span dir="ltr"><<a href="mailto:s.safarov@gmail.com" target="_blank">s.safarov@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Errol can you test VM timer with utility <a href="https://rt.wiki.kernel.org/index.php/Cyclictest" target="_blank">https://rt.wiki.kernel.org/index.php/Cyclictest</a><br><div><br></div><div>My VM currently have folowing results</div><div><pre>[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</pre></div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 6, 2015 at 11:15 AM, Errol Samuels <span dir="ltr"><<a href="mailto:ewsamuels@gmail.com" target="_blank">ewsamuels@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Good job and Thanks for sharing!<br></div><div><br><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">KVM at <span><a href="http://digitalocean.com" target="_blank">digitalocean.com</a></span>, Debian 7 64bit, FreeSWITCH 1.4.15: <span style="color:rgb(255,0,0)">bad precision</span></blockquote><div> </div></div>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.<br><br></div>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.<br><br></div>With regards to Xen was this at Linode or inhouse?<br><br><div>Thanks<span><font color="#888888"><br><br></font></span></div><span><font color="#888888"><div>Errol<br><br></div><div><br></div></font></span></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Apr 5, 2015 at 1:37 AM, Stanislav Sinyagin <span dir="ltr"><<a href="mailto:ssinyagin@gmail.com" target="_blank">ssinyagin@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">here we go:<br>
<a href="https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/" target="_blank">https://txlab.wordpress.com/2015/04/05/testing-rtp-clock-precision-on-a-virtual-machine/</a><br>
<div><div><br>
<br>
<br>
On Sat, Apr 4, 2015 at 4:26 PM, Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com" target="_blank">ssinyagin@gmail.com</a>> wrote:<br>
> On Sat, Apr 4, 2015 at 1:03 PM, Regis M <<a href="mailto:regis.freeswitch.org@tornad.net" target="_blank">regis.freeswitch.org@tornad.net</a>> wrote:<br>
>> How do you check wavs together in audacity ?<br>
><br>
> you just open two WAV files, align their starting position, and<br>
> visually check the waves. If there's a problem, you would see that<br>
> after few seconds, the waves are not aligned any more.<br>
><br>
>> Can you send me 2 samples wav (send... and recorded) so I could see the 20ms<br>
>> diff that you exposed...<br>
>><br>
>> Is there a way to automate the result checking, so it could help to monitor<br>
>> itsp quality<br>
><br>
> Here<br>
> <a href="https://github.com/openpreserve/scape-xcorrsound/issues/17" target="_blank">https://github.com/openpreserve/scape-xcorrsound/issues/17</a><br>
> this is a link to a tool which compares two sound files at the wave<br>
> level. You can also see the sound samples in the ticket.<br>
> The problem is, that currently this tool does not detect such slipping frames.<br>
><br>
> I will also write a detailed article with examples, during the weekend.<br>
><br>
><br>
><br>
><br>
><br>
>><br>
>><br>
>> 2015-04-04 12:53 GMT+02:00 Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com" target="_blank">ssinyagin@gmail.com</a>>:<br>
>>><br>
>>> Important is to send the media through two independent carriers - then you<br>
>>> can be sure that your clock is compared against a high quality one.<br>
>>><br>
>>> On Apr 4, 2015 12:46 PM, "Regis M" <<a href="mailto:regis.freeswitch.org@tornad.net" target="_blank">regis.freeswitch.org@tornad.net</a>><br>
>>> wrote:<br>
>>>><br>
>>>> Hi,<br>
>>>><br>
>>>> It's a very interresting test and conclusion.<br>
>>>><br>
>>>> I will try to build a similar environnement on my freeswitch to check<br>
>>>> some system :)<br>
>>>><br>
>>>> thanks<br>
>>>><br>
>>>><br>
>>>><br>
>>>> 2015-04-04 2:16 GMT+02:00 Stanislav Sinyagin <<a href="mailto:ssinyagin@gmail.com" target="_blank">ssinyagin@gmail.com</a>>:<br>
>>>>><br>
>>>>> hi,<br>
>>>>><br>
>>>>> Here are some test results which might be interesting:<br>
>>>>><br>
>>>>> I've set up a test FreeSWITCH server at digitalocean (they use KVM),<br>
>>>>> and originated test calls to some ITSP accounts. Each call played a<br>
>>>>> test sound file (voice samples from ITU:<br>
>>>>> <a href="http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050" target="_blank">http://www.itu.int/net/itu-t/sigdb/genaudio/AudioForm-g.aspx?val=1000050</a><br>
>>>>> ), and on the receiving end another FreeSWITCH server was recording<br>
>>>>> the received session. The receiving server was on a XEN VM. Both<br>
>>>>> servers talked G711 to their corresponding ITSP accounts.<br>
>>>>><br>
>>>>> Then I compared the source audio and received audio in Audacity editor.<br>
>>>>><br>
>>>>> The tests showed that the received voice wave shifts 20ms from the<br>
>>>>> original sound every few seconds, randomly back and forward. This<br>
>>>>> skewing was always present, regardless of ITSP and time of day.<br>
>>>>><br>
>>>>> Then I moved the sending server to a XEN VM, and the waves appeared<br>
>>>>> almost perfectly synchronized (there was a 5ms skew in one test, and I<br>
>>>>> guess it's related to transcoding buffer, as the sound was obviously<br>
>>>>> transcoded).<br>
>>>>><br>
>>>>> The effect was always visible with a 30-second sample, and I also made<br>
>>>>> additional tests with 2-minute samples.<br>
>>>>><br>
>>>>> It would also be interesting to test this from a VmWare VM. If someone<br>
>>>>> wants to run such a test, feel free to contact me directly.<br>
>>>>><br>
>>>>><br>
>>>>> cheers,<br>
>>>>> stan<br>
>>>>><br>
>>>>><br>
>>>>> _________________________________________________________________________<br>
>>>>> Professional FreeSWITCH Consulting Services:<br>
>>>>> <a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
>>>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>>>><br>
>>>>> Official FreeSWITCH Sites<br>
>>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>>>><br>
>>>>> FreeSWITCH-users mailing list<br>
>>>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>>><br>
>>>><br>
>>>><br>
>>>> _________________________________________________________________________<br>
>>>> Professional FreeSWITCH Consulting Services:<br>
>>>> <a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
>>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>>><br>
>>>> Official FreeSWITCH Sites<br>
>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>>><br>
>>>> FreeSWITCH-users mailing list<br>
>>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>><br>
>>><br>
>>> _________________________________________________________________________<br>
>>> Professional FreeSWITCH Consulting Services:<br>
>>> <a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
>>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>>><br>
>>> Official FreeSWITCH Sites<br>
>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>>><br>
>>> FreeSWITCH-users mailing list<br>
>>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
>>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>><br>
>><br>
>><br>
>> _________________________________________________________________________<br>
>> Professional FreeSWITCH Consulting Services:<br>
>> <a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
>> <a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
>><br>
>> Official FreeSWITCH Sites<br>
>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
>> <a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
>> <a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
>><br>
>> FreeSWITCH-users mailing list<br>
>> <a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
>> <a href="http://lists.freeswitch.org/mailman/listinfo/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/listinfo/freeswitch-users</a><br>
>> UNSUBSCRIBE:<a href="http://lists.freeswitch.org/mailman/options/freeswitch-users" target="_blank">http://lists.freeswitch.org/mailman/options/freeswitch-users</a><br>
>> <a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<br>
_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
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</div></div></blockquote></div><br></div>
</div></div><br>_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
<a href="http://www.cluecon.com" target="_blank">http://www.cluecon.com</a><br>
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<a href="mailto:FreeSWITCH-users@lists.freeswitch.org" target="_blank">FreeSWITCH-users@lists.freeswitch.org</a><br>
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<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br></blockquote></div><br></div>
</div></div><br>_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
<a href="mailto:consulting@freeswitch.org" target="_blank">consulting@freeswitch.org</a><br>
<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
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<br>
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<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br></blockquote></div><br></div>
</div></div><br>_________________________________________________________________________<br>
Professional FreeSWITCH Consulting Services:<br>
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<a href="http://www.freeswitchsolutions.com" target="_blank">http://www.freeswitchsolutions.com</a><br>
<br>
Official FreeSWITCH Sites<br>
<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br>
<a href="http://confluence.freeswitch.org" target="_blank">http://confluence.freeswitch.org</a><br>
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<a href="http://www.freeswitch.org" target="_blank">http://www.freeswitch.org</a><br></blockquote></div><br></div>