Re: [Xenomai-help] ensuring code running in kernel modules has realtime priority

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 01/18/2012 08:59 AM, RT wrote:
> Hi all,
> 
> we have an interesting situation. We are using a module to do communication 
> over a network (ethercat master module) to some remote IO.
> 
> The ethercat module is loaded against the kernel in the normal manner.
> 
> Now we possibly have overlooked that even though the call to the ethercat 
> module (ioctl call) from our real-time application takes place in a xenomai 
> real time task, the code of the ethercatmodule may be interrupted by other 
> processes running on the machine. Due to the fact that the modules code is 
> not running in any real-time prioritized space.
> 
> If this is indeed the case, what would be the best or easiest manner to 
> ensure that the module does not get interrupted, ie. to encapsulate it into 
> the xenomai real-time priority sphere?
> 
> Hope someone can point us in the right direction here. Its pretty urgent 
> because the system is already running live and we are intermittently 
> encountering this problem.

If I understand correctly, what you need is to rewrite the ethercat
driver as a real-time driver using the RTDM skin.

-- 
					    Gilles.