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

Anthony Minessale anthony.minessale at gmail.com
Tue Feb 1 23:47:19 MSK 2011 

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
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> 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
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
>>>>>> ----=======================----
>>>>>> 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
>>>>>> ----=======================----
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
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>>>
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>>
>>
>>
>> --
>> Anthony Minessale II
>>
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>>
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>>
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>
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>



-- 
Anthony Minessale II

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