6 Apr
2015
6 Apr
'15
5:09 p.m.
sent from my mobile, Giovanni Maruzzelli cell: +39 347 266 56 18 On Apr 6, 2015 5:31 PM, "Anthony Minessale" <anthony.minessale@gmail.com> wrote: > > Depending on the host and guest OS the timing will be a product of several thing. > If some of the features FS tries to detect are emulated, it can be a problem. > > The primary thing FS looks for is a kernel with timerfd support. > This should be the most accurate. If the guest OS supports timerfd but its using emulated hardware, it might not work as well as it should. > > So on something like openvz, you might have support for timerfd in your debian 7/8 instance but the host kernel has no support at all. Tony, in my understanding in OpenVZ you have one only kernel, and true timerfd. Each OpenVZ "container" is just a glorified jail, no emulation at all. A kernel namespace. But processes run directly on real kernel, real IRQs, real timerfd. Seems to me I never heard of FreeSWITCH problems with OpenVZ. Please correct me if I'm wrong. -giovanni > So in theory kvm would be preferred since it actually boots the guest kernel and you have a chance for it to hit the real timer hardware. > > If no timerfd is present, it reverts to the single thread ms precision thread with conditional broadcast for timing. > You can also manually configure a combo of one timerfd timer and shared broadcast. > > This param in switch.conf.xml helps to tune a few behavior you might want to compare results on. > > enable-softtimer-timerfd > > true|fd-per-timer --- Use one fd for each timer instance (default) > > false --- Don't use timerfd at all > > broadcast --- Use one timerfd and share it with conditional broadcasts > > This is one reason we do not support virtualization as its too variable to provide definitive policies to make things work every time. > > > > > > > > > > > > > > > > > On Mon, Apr 6, 2015 at 10:17 AM, Stanislav Sinyagin <ssinyagin@gmail.com> wrote: >> >> 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@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 >>>>>> >>>>> 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 >>>>>> >>>> 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 >>>>>> >>> 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 >>>>>> >> 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 >>>>>> 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 >>>>> 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 >>>> 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 >>> 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 >> 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 > > > > > -- > Anthony Minessale II ♬ @anthmfs ♬ @FreeSWITCH ♬ > > ☞ http://freeswitch.org/ ☞ http://cluecon.com/ ☞ http://twitter.com/FreeSWITCH > ☞ irc.freenode.net #freeswitch ☞ http://freeswitch.org/g+ > > ClueCon Weekly Development Call > ☎ sip:888@conference.freeswitch.org ☎ +19193869900 > > https://www.youtube.com/watch?v=9XXgW34t40s > > _________________________________________________________________________ > 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 > 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