[asterisk-users] Linux Kernel Timer Frequency and Asterisk

[Vicky]

1000 Hz is recommended if you use lot of meetme channels ( and maybe iax
trunking ? ) without a hardware timer .

On 08/02/07, Gordon Henderson <gordon+asterisk at drogon.net> wrote:
>
> On Wed, 7 Feb 2007, Mark Coccimiglio wrote:
>
> > Ok here is a real geek question,
> >
> > I building my own linux kernel for my asterisk system and came across
> the
> > kernel setting for the timer frequency.  I have one of 3 hardcode
> choices
> > 100Hz, 250 Hz and 1000Hz.  From what I understand the default Freq was
> > changed from 100Hz in kernel 2.4 to 1000Hz (1KHz) in kernel 2.6.  Timing
> is a
> > BIG issue in asterisk with all the TDM and zap channel stuff.  My guess
> is to
> > go with the lower 100 or 250 Hz option but that is only a guess.  The
> 1KHz
> > sounds like it will conflict with the Zap 1khz timer (or am I wrong
> about
> > that).  Does anyone know what the prefered settings are for Trixbox or
> > AsteriskNOW (or the asterisk code forks e.g. OpenPBX)?  Please let me
> know
> > what your experience has been.
>
> I always compile custom kernels and have been using 1KHz in all my systems
> which are for anything vaguely interactive.
>
> Most of my asterisk systems are 1GHz processors but I have a small handful
> which are 533MHz and all are working just fine.
>
> You're not using a recently kernel then ;-) 2.6.20 offers 300Hz too
> (supposedly good for video applications)
>
> Gordon
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