Messages in this thread |  | | | Subject | Re: [ANNOUNCE] Linux 2.6 Real Time Kernel | | From | Lee Revell <> | | Date | Sat, 09 Oct 2004 15:30:27 -0400 |
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On Sat, 2004-10-09 at 17:26, stefan.eletzhofer@eletztrick.de wrote: > On Sat, Oct 09, 2004 at 02:30:28PM -0400, Lee Revell wrote: > > On Sat, 2004-10-09 at 13:41, Karim Yaghmour wrote: > > > Sven-Thorsten Dietrich wrote: > > > > - Voluntary Preemption by Ingo Molnar > > > > - IRQ thread patches by Scott Wood and Ingo Molnar > > > > - BKL mutex patch by Ingo Molnar (with MV extensions) > > > > - PMutex from Germany's Universitaet der Bundeswehr, Munich > > > > - MontaVista mutex abstraction layer replacing spinlocks with mutexes > > > > > > To the best of my understanding, this still doesn't provide deterministic > > > hard-real-time performance in Linux. > > > > Using only the VP+IRQ thread patch, I ran my RT app for 11 million > > cycles yesterday, with a maximum delay of 190 usecs. How would this not > > satisfy a 200 usec hard RT constraint? > > I think the keyword here is "deterministic", isn't it?
Well, depends what you mean by deterministic. Some RT apps only require an upper bound on response time. This is a form of determinism.
Lee
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