[Xenomai] question on host tick processing

[Xenomai] question on host tick processing

[abhri]

Hi,
I have a doubt regarding host tick propagation. I understand that host 
tick will be relayed when XNHTICK bit is set and there is a domain 
migration to root. In case there is large delay to change domain from 
primary to secondary how is the host tick corrected when relayed next. 
Is there any correction mechanism in nucleus for keeping linux time correct?

Regards,
AB

Re: [Xenomai] question on host tick processing

[Gilles Chanteperdrix]

On 06/04/2012 03:30 PM, abhri wrote:
> Hi,
> I have a doubt regarding host tick propagation. I understand that host 
> tick will be relayed when XNHTICK bit is set and there is a domain 
> migration to root. In case there is large delay to change domain from 
> primary to secondary how is the host tick corrected when relayed next. 

If this happens, then there is a problem in your application. Part of
the things required of your application when writing an application for
a dual-kernel solution is to let the other kernel run from time to time.

> Is there any correction mechanism in nucleus for keeping linux time correct?

AFAIK, there is one in the linux kernel itself. The linux kernel uses
separate objects (clocksource and clockevents) for hardware clocks and
timers.

-- 
					    Gilles.