[Freeswitch-users] KVM vs. XEN virtualization
Errol Samuels
ewsamuels at gmail.com
Mon Apr 6 21:22:28 MSD 2015
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
>
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