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Thanks for letting me know about "sched_rt_runtime_us" !
I still don't understand what votes agains _always_ using your patch, though.
-Michael
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Hi Michael,
Coming from the HW community, when I think realtime, I think hard realtime i.e. max latency is guaranteed in any cases. If the Real-Time group scheduling is enabled and I use PREEMPT-RT, my RT thread that has the max priority can be preempted by a non RT thread after 950 ms of CPU processing. And it will run after 5 ms. It is not acceptable because you add an extra latency.
If I disable this with PREEMPT-RT, I can have something that is closer to a hard realtime OS.
PREEMPT-RT is soft realtime and it is important to avoid mechanisms that introduce extra latencies. PREEMPT-RT must be tuned finally. See: Real-Time Failure. F. Rowand.
http://elinux.org/images/b/be/real_time_linux_failure.pdf Patrice.
Honored Contributor
