[Freeswitch-users] FreeSWITCH under the Linux 2.6.29 kernel

Michael Jerris mike at jerris.com
Thu Apr 30 11:48:21 PDT 2009

Can you point out any place we do sub milli second sleeps?  The timer  
thread should be doing 1ms, I can't think of any that would be less.


On Apr 30, 2009, at 2:28 PM, Paweł Pierścionek wrote:

> Hi,
>  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
> second.
> Pawel,

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