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

Frank Carmickle frank at carmickle.com
Fri Jan 28 21:49:51 MSK 2011


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.


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