Messages in this thread | | | Date | Thu, 07 Jan 2010 08:23:52 +0100 | From | Carsten Emde <> | Subject | Re: [RFC] [rt-tests] change to cyclictest behavior |
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Clark,
>> -S --smp Standard SMP testing (equals -a -t -n -d0), >> same priority on all threads. After having done some tests with a quickly hacked cyclictest version, I have found an issue with including -d0. Apparently, small numbers make life especially difficult for the scheduler; this is why we often used -d1. Specifying -d0 seems a special case where all threads are in sync. Maybe, we may miss some important latency constellations, if we do not let the tasks slightly interfere. In any case, I would like to be able to specify a distance _in addition_ to -S. This would create a scenario where
cyclictest -d1 -S
results in a distance of 0, and
cyclictest -S -d1
results in a distance of 1. Would this be acceptable?
Carsten.
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