From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Glatz <andreasglatz@domain.hid>
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Date: Tue, 10 Mar 2009 08:43:19 -0400
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Subject: Re: [Xenomai-core] rt_queue_create in RT task?
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To: rpm@xenomai.org
Cc: xenomai@xenomai.org

Hi,

On Mon, 2009-03-09 at 18:02 +0100, Philippe Gerum wrote:
> Andreas Glatz wrote:
> > Hi,
> > 
> > On Mon, 2009-03-09 at 17:08 +0100, Philippe Gerum wrote:
> >> Andreas Glatz wrote:
> >>> Hi,
> >>>
> >>> Calling rt_queue_create in a real-time task is supposed to fail
> >>> according to the documentation. 
> >>>
> >> It fails from kernel space, otherwise, from user-space, your application would 
> >> simply be moved to a Linux context automatically for processing the 
> >> rt_queue_create() syscall.
> > 
> > Currently, we are developing in Userspace, so everything works fine. But
> > we still would like to have the option to run in kernel-space if for
> > some reason the user-space performance is too poor. 
> >
> 
> Could you elaborate a bit about this? What was bad, latency? If so, what is your 
> target arch/platform, and which typical latency do you require?
> 

Interrupt latency is an issue. But we are still in the development phase
and I don't have detailed figures available. I'll post them when I get
them!

Thanks for yr help,
Andreas