Hi,
We heavily use meetme/SLA functionality in Asterisk, and continuously run into
issues with dahdi timing. The two errors we get are:
ERROR[6518] res_timing_dahdi.c: Failed to configure DAHDI timing fd for 0 sample
timer ticks
WARNING[22024] app_meetme.c: Unable to write frame to channel
Right now, dahdi in our setup uses the software timer (with res_timing_dahdi.so
which gives much better results compared to res_timing_timerfd.so). On an idle
system (Centos 6, Asterisk 1.8.7, dahdi 2.5), dahdi_test results are pretty good
at about %99.99. However, when loaded, the numbers fluctuate between %99.90 and
%99.99 which seem to cause the above errors.
We tried Sangoma UT50 as a timing device (it's USB based), but the test
results were worse (between 99.98 - 99.97 when idle, and had big dips when
loaded and there is no IRQ sharing).
We are planning to order Digium AEX410 cards hoping they will be an improvement
over dahdi_dummy and Sangoma. Does anyone have experience with these cards? Can
we get a stable performance from them even under load?
Also (for Digium developers who might be reading this list), any plans for
decoupling SLA from dahdi timing in future releases of Asterisk?
Thanks,
Mert
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