Re: Which version of preempt_realtime to use?

[Robert Schwebel <r.schwebel@pengutronix.de>]

Jürgen,

On Mon, Jan 19, 2009 at 09:45:58PM +0100, Jürgen Mell wrote:
> 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.

Can you reproduce these long latencies with cyclictest, or does it only
happen with your code?

rsc
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