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

Wed Feb 2 11:34:52 MSK 2011

I've now tested the latest GIT, and it now works fine with the Debian 
lenny default kernel. I didnt get around to recompiling it for 1000 HZ 
though, but I tried changing clocksource which didnt help at all.

This is on a Dell server, and I'm not running it on a virtual server.

FYI I also tried latest GIT yesterday, with the same results as stated 
in my first mail.

Regards
Oyvind

On 2011-02-01 21:47, Anthony Minessale 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
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>>>>>>>> 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
>>>>>>>>
>>>>>>>>
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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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>>      
>
>
>    