[Freeswitch-users] KVM vs. XEN virtualization
Sergey Safarov
s.safarov at gmail.com
Tue Apr 7 00:02:17 MSD 2015
Errol are is "test3" host proxying RTP audio stream?
You can check is by command
tcpdump -ni ens192 udp and port not 5060
If stream exist you will see one output string per one RTP packet
On Mon, Apr 6, 2015 at 8:22 PM, Errol Samuels <ewsamuels at gmail.com> wrote:
> Hi Stanislav,
>
> Just to let you know I have a customer using all 3 virtualization
> technologies mentioned (KVM, Xen and VMWare) and they all seem to be
> happy. However for the larger setups with 2500+ users my preference is KVM
> without a doubt. I have for example an install with 4 FusionPBX /
> Freeswitch VMs with Kamailio in Front for residential phone service all
> sharing same Postgres DB and serving 5000 users, 4000 DIDs running for more
> than a year with no voice quality issues. We using Proxmox for this setup
> and it works great.
>
> Test 3
> ======
> This one is using Proxmox and -t20 with some strange results!?
>
> *VM: * KVM with 4 Cores / 8GB Ram and *Virtio Drivers* for Network and HD)
> *OS:* Ubuntu 12.04.5 LTS / Linux 3.13.0-40-generic x86_64
>
> root at voip-admin:~# date && cyclictest -t20 -p 80 -d 0 -n -i 125 -l 240000
> && date
> Mon Apr 6 13:03:00 EDT 2015
> # /dev/cpu_dma_latency set to 0us
> policy: fifo: loadavg: 1.16 0.61 0.32 1/227 9038
>
> T: 0 ( 9000) P:80 I:125 C: 240000 Min: 2 Act: 29 Avg: 2957 Max:
> 3835266
> T: 1 ( 9001) P:80 I:125 C: 240000 Min: 2 Act: 9 Avg: 3018 Max:
> 3888022
> T: 2 ( 9002) P:80 I:125 C: 240000 Min: 2 Act: 28 Avg: 2978 Max:
> 3835499
> T: 3 ( 9003) P:80 I:125 C: 240000 Min: 2 Act: 31 Avg: 2975 Max:
> 3857444
> T: 4 ( 9004) P:80 I:125 C: 240000 Min: 2 Act: 29 Avg: 3029 Max:
> 3859799
> T: 5 ( 9005) P:80 I:125 C: 240000 Min: 2 Act: 22 Avg: 2985 Max:
> 3838433
> T: 6 ( 9006) P:80 I:125 C: 240000 Min: 2 Act: 14 Avg: 3044 Max:
> 3872244
> T: 7 ( 9007) P:80 I:125 C: 240000 Min: 4 Act: 10 Avg: 3007 Max:
> 3867133
> T: 8 ( 9008) P:80 I:125 C: 240000 Min: 3 Act: 20 Avg: 3071 Max:
> 3905688
> T: 9 ( 9009) P:80 I:125 C: 240000 Min: 4 Act: 13 Avg: 3022 Max:
> 3856911
> T:10 ( 9010) P:80 I:125 C: 240000 Min: 2 Act: 9 Avg: 3016 Max:
> 3885199
> T:11 ( 9011) P:80 I:125 C: 240000 Min: 3 Act: 32 Avg: 3011 Max:
> 3862044
> T:12 ( 9012) P:80 I:125 C: 240000 Min: 3 Act: 16 Avg: 3012 Max:
> 3888333
> T:13 ( 9013) P:80 I:125 C: 240000 Min: 2 Act: 23 Avg: 2949 Max:
> 3844433
> T:14 ( 9014) P:80 I:125 C: 240000 Min: 2 Act: 25 Avg: 3009 Max:
> 3878488
> T:15 ( 9015) P:80 I:125 C: 240000 Min: 3 Act: 12 Avg: 3019 Max:
> 3870499
> T:16 ( 9016) P:80 I:125 C: 240000 Min: 3 Act: 24 Avg: 2972 Max:
> 3856044
> T:17 ( 9017) P:80 I:125 C: 240000 Min: 3 Act: 34 Avg: 3023 Max:
> 3872944
> T:18 ( 9018) P:80 I:125 C: 240000 Min: 2 Act: 25 Avg: 2988 Max:
> 3869488
> T:19 ( 9019) P:80 I:125 C: 240000 Min: 2 Act: 10 Avg: 2949 Max:
> 3847277
> Mon Apr 6 13:03:30 EDT 2015
>
> This is interesting if not alarming..lol
>
>
> I re-ran the test on DO again below but with -t20 this time now the
> latency seems to be ~9ms.
>
> Test 4
> =====
> *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
>
> root at demo:~# date && cyclictest -t20 -p 80 -d 0 -n -i 125 -l 240000 &&
> date
> Mon Apr 6 16:57:30 UTC 2015
> # /dev/cpu_dma_latency set to 0us
> policy: fifo: loadavg: 1.31 0.59 0.34 1/122 31201
>
> T: 0 (31181) P:80 I:125 C: 240000 Min: 4 Act: 20 Avg: 34 Max:
> 8447
> T: 1 (31182) P:80 I:125 C: 240000 Min: 2 Act: 13 Avg: 29 Max:
> 5022
> T: 2 (31183) P:80 I:125 C: 240000 Min: 2 Act: 6 Avg: 27 Max:
> 4998
> T: 3 (31184) P:80 I:125 C: 240000 Min: 2 Act: 8 Avg: 27 Max:
> 6140
> T: 4 (31185) P:80 I:125 C: 240000 Min: 3 Act: 19 Avg: 31 Max:
> 7474
> T: 5 (31186) P:80 I:125 C: 240000 Min: 3 Act: 8 Avg: 32 Max:
> 7454
> T: 6 (31187) P:80 I:125 C: 240000 Min: 4 Act: 10 Avg: 32 Max:
> 7507
> T: 7 (31188) P:80 I:125 C: 240000 Min: 4 Act: 11 Avg: 32 Max:
> 9008
> T: 8 (31189) P:80 I:125 C: 240000 Min: 2 Act: 18 Avg: 28 Max:
> 5737
> T: 9 (31190) P:80 I:125 C: 240000 Min: 2 Act: 12 Avg: 28 Max:
> 7462
> T:10 (31191) P:80 I:125 C: 240000 Min: 2 Act: 8 Avg: 29 Max:
> 7432
> T:11 (31192) P:80 I:125 C: 240000 Min: 4 Act: 25 Avg: 27 Max:
> 7404
> T:12 (31193) P:80 I:125 C: 240000 Min: 3 Act: 18 Avg: 30 Max:
> 8496
> T:13 (31194) P:80 I:125 C: 240000 Min: 4 Act: 18 Avg: 32 Max:
> 5962
> T:14 (31195) P:80 I:125 C: 240000 Min: 2 Act: 8 Avg: 30 Max:
> 8573
> T:15 (31196) P:80 I:125 C: 240000 Min: 4 Act: 17 Avg: 32 Max:
> 5963
> T:16 (31197) P:80 I:125 C: 240000 Min: 3 Act: 15 Avg: 31 Max:
> 7477
> T:17 (31198) P:80 I:125 C: 240000 Min: 4 Act: 16 Avg: 31 Max:
> 9010
> T:18 (31199) P:80 I:125 C: 240000 Min: 3 Act: 18 Avg: 35 Max:
> 7447
> T:19 (31200) P:80 I:125 C: 240000 Min: 2 Act: 15 Avg: 34 Max:
> 7471
> Mon Apr 6 16:58:00 UTC 2015
>
> BR
>
> Errol
>
>
>
>
> On Mon, Apr 6, 2015 at 5:13 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
> wrote:
>
>> A customer is setting up a new telephony switch, and I'm helping them to
>> organize the testing. I noticed the slipping frames in received audio, and
>> then at first I though it's the failure at the receiving side, but then
>> figured out it's my host at DO that is generating unaligned RTP flow.
>>
>> So, now I'm trying to figure out what would be the best virtualized
>> environment to run FreeSWITCH :)
>>
>>
>>
>>
>>
>> On Mon, Apr 6, 2015 at 6:05 PM, Brian West <brian at freeswitch.org> wrote:
>>
>>> I've never had issues running under KVM on Proxmox, Looking back at this
>>> thread was there a specific issue that you're trying to solve that put you
>>> on to this path of testing?
>>>
>>> On Mon, Apr 6, 2015 at 10:51 AM, Stanislav Sinyagin <ssinyagin at gmail.com
>>> > wrote:
>>>
>>>> yes, and we're trying to find the one that works with minimal impact
>>>> on quality :)
>>>>
>>>> I'm thinking to move my test server (the one on receiving side) from
>>>> Xen VM to a physical ARM machine at https://www.scaleway.com/ in
>>>> France. It would record audio and raw UDP packets and provide them for
>>>> downloading to everyone.
>>>>
>>>> Do we know about any timing issues on ARM platform?
>>>>
>>>> if someone sponsors some additional DID numbers, that will be
>>>> appreciated.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, Apr 6, 2015 at 5:30 PM, Anthony Minessale
>>>> <anthony.minessale at 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.
>>>> > 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 at 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 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
>>>> >>>>>> >>>>> FreeSWITCH-users at 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 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
>>>> >>>>>> >>>> FreeSWITCH-users at 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 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
>>>> >>>>>> >>> FreeSWITCH-users at 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 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
>>>> >>>>>> >> FreeSWITCH-users at 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 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
>>>> >>>>>> FreeSWITCH-users at 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 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
>>>> >>>>> FreeSWITCH-users at 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 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
>>>> >>>> FreeSWITCH-users at 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 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
>>>> >>> FreeSWITCH-users at 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 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
>>>> >> FreeSWITCH-users at 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 at conference.freeswitch.org ☎ +19193869900
>>>> >
>>>> > https://www.youtube.com/watch?v=9XXgW34t40s
>>>> >
>>>> >
>>>> _________________________________________________________________________
>>>> > 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
>>>> > FreeSWITCH-users at 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 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
>>>> FreeSWITCH-users at lists.freeswitch.org
>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>> UNSUBSCRIBE:
>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>> http://www.freeswitch.org
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> *Brian West*
>>> brian at freeswitch.org
>>>
>>>
>>> *Twitter: @FreeSWITCH , @briankwest*
>>> http://www.freeswitchbook.com
>>> http://www.freeswitchcookbook.com
>>>
>>> ClueCon 2015 Call for Speakers
>>> <https://www.cluecon.com/call-for-speakers/> | Register
>>> <https://freeswitch.com/cart.php?gid=1> TODAY! | Reddit: /r/freeswitch
>>> <https://www.reddit.com/r/freeswitch>
>>>
>>> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
>>> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>>>
>>> _________________________________________________________________________
>>> 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
>>> FreeSWITCH-users at 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 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
>> FreeSWITCH-users at 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 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
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
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