On 02/10/13 12:17, Johan Wilfer wrote:
Hi,
I have some servers that are dedicated to do meetme conferencing. From
some previous test i concluded that I need to use dahdi_dummy as it is
more accurate.
If I did use the core timers in dahdi (not loading dahdi_dummy) I got
bad quality in the conferences and dahdi_test showed 99.6% as worst.
I thought maybe the issue as bad hardware for the timing or something
else. But today I re-ran these tests on another server showing the
same thing.
- Can anybody comment on why DAHDI with core timers drop down to 99.6%
occasionally?
- Is a hardware-card for timing the most efficient way to get timing
even if I just use the card for the timing?
Its a little different when you are using meetme as its an application
built into dahdi itself and not a native asterisk application. It will
therefore always use dahdi for its timing. If dahdi doesnt have a
hardware interface (sangoma sell a usb based timing source if you want a
hardware source) then it will use a software timing source of some form.
I dont know what method it uses.
Asterisk itself will use dahdi for timing but if res_timerfd is
available it will use that itself. With your kernel version timerfd
should be available.
So if you run the following command asterisk will perform 1024 ticks
over 1000ms which is equivalent to the dahdi test of 8192 over 8000ms
(if you run it a few times). You can see in my case asterisk is using
timerfd and no issues at all with the timing.
> timing test 1024
Attempting to test a timer with 1024 ticks per second.
Using the 'timerfd' timing module for this test.
It has been 1000 milliseconds, and we got 1024 timer ticks
We are developing a conferencing feature and rather than use meetme with
its dahdi requirement we are using confbridge10 instead so we dont have
to have dahdi installed and it will use the better timerfd timing source.
More information about timing sources can be found at :-
https://wiki.asterisk.org/wiki/display/AST/Timing+Interfaces
--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
http://www.asterisk.org/hello
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
