[Freeswitch-users] Choppy VM when using loopback (on Debian lenny)

Thu Feb 3 13:31:01 MSK 2011

We faced same trouble with FreeSWITCH Version 1.0.head (git-33848eb
2011-02-01 08-56-26 +0100), the problem persists with loopback
channels. Even if two sip endpoints are bridged via loopback, sound is
choppy.

We have bridge_early_media=true on loopback channel bridge command and
loopback_bowout=false, loopback_bowout_on_execute=false

2011/2/2 Dan Lane <null at invalid.name>:
> This seems to have resolved the issue for us :)
>
> Thanks.
>
> On Tue, Feb 1, 2011 at 8:47 PM, Anthony Minessale
> <anthony.minessale at gmail.com> wrote:
>> Try the latest GIT, I reverted the last patch and tried to solve the
>> problem differently.
>>
>>
>> On Tue, Feb 1, 2011 at 2:11 PM, Dan Lane <null at invalid.name> wrote:
>>> Yes, using 1f1541b our calls that use mod_loopback into mod_conference
>>> are unusable. The audio is choppy and delay increases as time passes.
>>>
>>> I thought it was an issue relating to the default 100Hz kernel on EC2
>>> so I spent some time yesterday putting together a 1000Hz kernel but it
>>> didn't make any difference. In the meantime I've compiled mod_loopback
>>> from 4c5426f and loaded it with my 1f1541b build which eliminates the
>>> issue.
>>>
>>> I haven't added it to Jira yet as I want to spend some time debugging
>>> it (and I also owe you some debug info for FS-2934) but the problem is
>>> definitely there.
>>>
>>> On Tue, Feb 1, 2011 at 3:58 PM, Anthony Minessale
>>> <anthony.minessale at gmail.com> wrote:
>>>> Are you saying you have better results on that version than you do on
>>>> the latest?
>>>> What conditions do you have that cause you trouble, what is the
>>>> endpoint on the other side.
>>>>
>>>> If the last commit to mod_loopback intended to improve audio quality
>>>> actually makes it worse I need to investigate it.
>>>>
>>>>
>>>> On Tue, Feb 1, 2011 at 5:53 AM, Dan Lane <null at invalid.name> wrote:
>>>>> FWIW we've been also been having audio issues with loopback recently
>>>>> on EC2 (with a 1000Hz kernel).
>>>>>
>>>>> We worked around it in the short term by reverting mod_loopback to
>>>>> git-4c5426f during the build process.
>>>>>
>>>>> For anyone else who wants to try this just run "git checkout 4c5426f"
>>>>> in src/mod/endpoints/mod_loopback then build as usual. This is NOT a
>>>>> long term solution though.
>>>>>
>>>>> On Mon, Jan 31, 2011 at 8:02 AM, Øyvind Albrigtsen <oa at estation.dk> wrote:
>>>>>> Thanks for all your feedback. I'll keep on trying and inform you what
>>>>>> worked for me.
>>>>>>
>>>>>>
>>>>>> Regards
>>>>>> Oyvind
>>>>>>
>>>>>> On 2011-01-29 21:48, Anthony Minessale wrote:
>>>>>>> Everyone should try latest GIT before pondering any further because I
>>>>>>> added a patch like 2 days ago to adress this issue.
>>>>>>>
>>>>>>>
>>>>>>> On Sat, Jan 29, 2011 at 2:12 PM, Frank Park<frank at telonium.com>  wrote:
>>>>>>>
>>>>>>>> Yeah. I, too, don't see the correlation between the NTP and hw timer..
>>>>>>>> I am not familiar with the timer_test command and what it's measuring, but
>>>>>>>> of the 50 tests it ran, min is 19089 and max is 20713.
>>>>>>>> Frank
>>>>>>>>
>>>>>>>>
>>>>>>>> On Fri, Jan 28, 2011 at 2:33 PM, David Ponzone<david.ponzone at ipeva.fr>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Frank,
>>>>>>>>> I fail to see the relationship between the hw timer and NTP.
>>>>>>>>> Can you please elaborate ?
>>>>>>>>> David Ponzone  Direction Technique
>>>>>>>>> email: david.ponzone at ipeva.fr
>>>>>>>>> tel:      01 74 03 18 97
>>>>>>>>> gsm:   06 66 98 76 34
>>>>>>>>> Service Client IPeva
>>>>>>>>> tel:      0811 46 26 26
>>>>>>>>> www.ipeva.fr  -   www.ipeva-studio.com
>>>>>>>>> Ce message et toutes les pièces jointes sont confidentiels et établis à
>>>>>>>>> l'intention exclusive de ses destinataires. Toute utilisation ou diffusion
>>>>>>>>> non autorisée est interdite. Tout message électronique est susceptible
>>>>>>>>> d'altération. IPeva décline toute responsabilité au titre de ce message s'il
>>>>>>>>> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire de ce
>>>>>>>>> message, merci de le détruire immédiatement et d'avertir l'expéditeur.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Le 28/01/2011 à 19:49, Frank Carmickle a écrit :
>>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>>
>>>>>>>>> On Jan 28, 2011, at 7:39 AM, Øyvind Albrigtsen wrote:
>>>>>>>>>
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> I'm using latest git-version of Freeswitch, and when I go to voicemail
>>>>>>>>>
>>>>>>>>> when calling a number the sound playback is choppy and it skips some of
>>>>>>>>>
>>>>>>>>> the digits in the number I called.
>>>>>>>>>
>>>>>>>>> What kind of results do you get from timer_test at the fs_cli?  Are you
>>>>>>>>> running on hardware or are you virtualized?  What is your clock source set
>>>>>>>>> to and what are your available clock source options?  See
>>>>>>>>> /sys/devices/system/clocksource/clocksource0/available_clocksource and
>>>>>>>>> /sys/devices/system/clocksource/clocksource0/current_clocksource.  I am
>>>>>>>>> running virtualized with the 2.6.26-2-xen-amd64 and I can get timer_test to
>>>>>>>>> hang at 19998/19999 which works very well for me.  When I was having problem
>>>>>>>>> it was reporting numbers all over the map from 17400 to 22600 with lots of
>>>>>>>>> randomness in between.  I have my clocksource set to jiffies and xen
>>>>>>>>> independent wallclock set to 1.  Of course at that point you need to have
>>>>>>>>> ntp running against a bunch of servers to drive your clock nice and steady.
>>>>>>>>>   I know my set up is probably a lot different than yours but I thought I'd
>>>>>>>>> toss it out there to show that some of the harshest conditions can be dealt
>>>>>>>>> with and don't give up trying.  If you are running on hardware with a cpu
>>>>>>>>> that doesn't have constant_tsc then you might have some problems.  Just play
>>>>>>>>> with the different timer options until you find the one that works.
>>>>>>>>>
>>>>>>>>> HTH
>>>>>>>>> --FC
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> FreeSWITCH-users mailing list
>>>>>>>>> FreeSWITCH-users at lists.freeswitch.org
>>>>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
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>>>>>>>>> http://www.freeswitch.org
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> FreeSWITCH-users mailing list
>>>>>>>>> FreeSWITCH-users at lists.freeswitch.org
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>>>>>>>>> http://www.freeswitch.org
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>>
>>>>>>>> ----=======================----
>>>>>>>> Frank Park
>>>>>>>> Telonium Communications, LLC
>>>>>>>> frank at telonium.com
>>>>>>>> http://www.telonium.com
>>>>>>>> Follow Us on Twitter: @GetTelonium
>>>>>>>> 404-566-8888 x1001 Office
>>>>>>>> 404-939-4242 Cell
>>>>>>>> ----=======================----
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> FreeSWITCH-users mailing list
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
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>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> FreeSWITCH-users mailing list
>>>>> FreeSWITCH-users at lists.freeswitch.org
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>>>>> http://www.freeswitch.org
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Anthony Minessale II
>>>>
>>>> FreeSWITCH http://www.freeswitch.org/
>>>> ClueCon http://www.cluecon.com/
>>>> Twitter: http://twitter.com/FreeSWITCH_wire
>>>>
>>>> AIM: anthm
>>>> MSN:anthony_minessale at hotmail.com
>>>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
>>>> IRC: irc.freenode.net #freeswitch
>>>>
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>>>>
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>>>
>>> _______________________________________________
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>>>
>>
>>
>>
>> --
>> Anthony Minessale II
>>
>> FreeSWITCH http://www.freeswitch.org/
>> ClueCon http://www.cluecon.com/
>> Twitter: http://twitter.com/FreeSWITCH_wire
>>
>> AIM: anthm
>> MSN:anthony_minessale at hotmail.com
>> GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
>> IRC: irc.freenode.net #freeswitch
>>
>> FreeSWITCH Developer Conference
>> sip:888 at conference.freeswitch.org
>> googletalk:conf+888 at conference.freeswitch.org
>> pstn:+19193869900
>>
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>>
>
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-- 
Best regards,

Dmitry Sytchev,
IT Engineer