Sergey,
[..]
But when i enable load with codesyscontrol-system(about 80% CPU load), i
have following results:
System without RT-patch:
T: 0 ( 1412) P:80 I:10000 C: 10000 Min: 8 Act: 16 Avg: 13 Max:
572
System with RT-patch:
T: 0 ( 1549) P:80 I:10000 C: 10000 Min: 11 Act: 14 Avg: 17 Max:
2492
Is it normal that max jitter in system with RT-patch more(almost 5x
time) than in system without RT-patch, in this case? [..]
Is the codesyscontrol system running at priority above 80 or below? If
above, then at least the second result makes sense, since on a
single-core system only the one task that runs at highest priority is
the real-time task that enjoys the worst-case latency of the system. All
other tasks do not. If, however, priority 80 of the cyclictest task is
the highest priority of all tasks, then you may have detected a problem
that needs to be fixed.
Note that cyclictest is intended as a placeholder of a real-time task
for people who do not have their own user-space real-time project, for
example kernel developers and board manufacturers. Once you have your
own real-time application, you better equip it with internal real-time
checks in a similar way as cyclictest does it, but you should not run
cyclictest in parallel.
Thanks,
-Carsten.
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