Le 14/09/2010 14:16, Armin Steinhoff a écrit :
Robert Schwebel wrote:
On Tue, Sep 14, 2010 at 11:24:21AM +0200, Raz wrote:
anyone can say preempt rt is hard real time?
Hard realtime has something to do with how you define "missing the
deadline". If somebody cuts the cable of your roboter controller in the
factory hall, the system misses the deadline. So it is all about
probabilities: hard realtime systems have a very, very low probability
of missing the deadline. However, in real life systems, it is> 0%.
So yes, if you talk about real world, it is hard realtime.
Hm, and what do think about that statement from FSMLabs:
"Linux “PREEMPT” real-time is a continuing experiment aimed at audio
and video playing with unreliable results and a detrimental affect on
“enterprise” performance"
Hello,
"soft realtime vs hard realtime" will be the troll in the embedded
community for the next years after the "with or without MMU" troll...
Patrice
--Armin
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