Re: [Xenomai-help] Timer frequency

[karre@domain.hid]

Hi Gilles,

Thank you for your answer!

Does the Linux-Kernel need to be triggered every now and then to adjust system clock? I know that in times of DOS, the system timer had to occur every 18.3 seconds, and I have heard that Linux adjusted this for better scheduling. Do you know how often Xenomai issues a timer irq during idle phases?

Thanks in advance,

Richard
-------- Original-Nachricht --------
Datum: Fri, 20 Apr 2007 22:27:16 +0200
Von: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
An: karre@domain.hid
CC: xenomai@xenomai.org
Betreff: Re: [Xenomai-help] Timer frequency

> karre@domain.hid wrote:
>  > Hi folks,
>  > 
>  > does Xenomai adjust the system timer frequency? I probably does, so how
> can I find out the frequency on my system?
> 
> See:
> http://www.xenomai.org/documentation/branches/v2.3.x/html/api/group__native__timer.html#g66f026b0ac68ef3acde0e6d1bdb6baaf
> 
> In short, by default, the system timer is handled in aperiodic mode,
> which means that there is no timer frequency: the system timer is
> programmed at each software timer event to tick at next event. 
> 
> If you are using the stable version or previous releases, the system
> timer can be set to periodic mode at compilation time or by passing
> parameters to skins modules.
> 
> Xenomai trunk emulates periodic mode over aperiodic mode and allows to
> set for each skin whether it will use the aperiodic timer, or an
> (emulated) periodic timer.
> 
> -- 
> 
> 
> 					    Gilles Chanteperdrix.

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