Re: [Xenomai] Interrupt latency close to 1ms on powerpc Xenomai 2.6.4

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

On Thu, Oct 08, 2015 at 04:19:52PM -0400, Lennart Sorensen wrote:
> On Thu, Oct 08, 2015 at 11:15:49AM -0400, Lennart Sorensen wrote:
> > On Thu, Oct 08, 2015 at 04:52:14PM +0200, Gilles Chanteperdrix wrote:
> > > On Thu, Oct 08, 2015 at 10:43:40AM -0400, Lennart Sorensen wrote:
> > > > On Thu, Oct 08, 2015 at 08:50:26AM +0200, Philippe Gerum wrote:
> > > > > This is a recent change (d818ed7d0a4682) after it became clear that
> > > > > dealing with some interrupt types for enabling/disabling IRQ lines would
> > > > > require this.
> > > > 
> > > > Well at least that is an excellent explanation for the change in
> > > > behaviour.
> > > > 
> > > > Too bad that it has to be done for everything, just because some types
> > > > require it, but there almost certainly isn't any nice way to do it
> > > > otherwise.
> > > > 
> > > > And as you said, xenomai 3 doesn't even allow doing interrupt handling
> > > > from userspace the way we have been trying to do it.
> > > > 
> > > > I suppose we could revert that patch for now until we can fix the real
> > > > problem.
> > > 
> > > If you revert that patch, you will also have to remove some context
> > > checks in the recent I-pipe patches.
> > 
> > Not sure I grabbed that patch yet, but good to know.
> > 
> > Happen to know the commit number or title of that one?
> > 
> > Do you mean fb919529?
> 
> Just reverting the xenomai patch seems to have resolved part of the issue,
> but not all of it, so perhaps the suggested ipipe bit is needed too,
> if only I could find it.

I am talking about that line:
http://git.xenomai.org/ipipe.git/tree/kernel/irq/chip.c?h=ipipe-3.18#n893

-- 
					    Gilles.
https://click-hack.org