Hi, On Tue, Sep 14, 2010 at 4:21 PM, Jeff Angielski <jeff@xxxxxxxxxxxxxxx> wrote: > No. Preempt rt it's not hard realtime. > > But most people/companies who think they need hard realtime really don't. > They can live with soft realtime and have a really low probability of > missing deadlines and having long latencies. For these people, the preempt > rt is adequate. I agree. Hard, soft ... far too qualitative for a discussion like this. Numbers, test cases and applications determine different meanings of these words. Top copy a phrase from one of the presentations from dresden. Real-time need not always be real fast. hard Real-time = Speed + Determinism So hard real time is a moving target. Would I use RT_PREEMPT to run servo loops at 60 microseconds on a 160 Mhz powerpc ? Surely not ! Or not yet. my 2 cents. regards /prady -- http://www.prady.in -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
