Re: Which version of preempt_realtime to use?

[Esben Nielsen <esn@terma.com>]

On Mon, 2009-01-19 at 21:45 +0100, Jürgen Mell wrote:
> >
> > Esben,
> >
> >   
> >> I am going to suggest that we use preempt_realtime for a _real_ project
> >> (i.e. costumers will depend on it). We will run on standeard x86 (maybe
> >> x86_64) hardware and will only need serial interfaces for realtime
> >> purposes. Security is not an issue. Which version of preempt_realtime
> >> should I pick?
> >>     
> > The latest and greatest *and* most stable version is 2.6.24.7-rt26. As
> > far as I know (but maybe others know better), there are no unresolved
> > issues with this "Latest Stable". The kernel release 2.6.24 may not
> > contain sufficient architecture support for PPC and ARM, but the large
> > majority of x86 based processors and chipsets is well supported.
> >
> > Please report, if anything does not work as expected.
> >   
> The only thing which is missing for me from the 2.6.24.7-rt series is
> the patch
> "x86-fpu-fix-config_preempt-y-corruption-of-application-s-fpu-stack.patch"
> , GIT commit
>  870568b39064cab2dd971fe57969916036982862 from mainline 2.6.25. This
> might cause trouble with applications which are using floating point
> arithmetics. Otherwise I am using the 2.6.24.7-rt series on a machine
> control for a 16 axes machine and it is working mostly well. There are
> only some points where I get big delays (up to some milliseconds) with
> my timer routine, where normally delays are below 50 microseconds. Up to
> now I could not find the application ( X ??) which is causing this.
> 
> Bye,
>            Jürgen
> 

Which GIT-tree are you refering to?

Is there at all an up-to-date GIT repository with preempt realtime?

Esben

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