[Freeswitch-users] FreeSWITCH under the Linux 2.6.29 kernel
pawel at voiceworks.pl
Thu Apr 30 11:28:23 PDT 2009
With really old kernels (100Hz) if You do sleep(1ms) You sleep for
10ms on average.
With enterprise kernels (250Hz) Your sleep resolution increases by a
factor of 4.
With fresh kernels (1000Hz) You get real 1ms timer resolution -
10fold increase compared to old kernels.
With tickless You get whatever resolution You want - eg when You
sleep for 100 microseconds(micro not mili) then You get exactly what
You wish for.
Now for reasons I do no try to understand :) there are a lot of
really short sleeps and fast timers in FreeSwitch - like 100
micro(1/10th of a ms).
So with CentOS such a 100 microsecond sleep cannot "fire" faster
then 250 times a second.
With tickless kernel same 100 microsecond sleep "fires" 10k times a
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