Re: [patch] Real-Time Preemption, -RT-2.6.10-rc2-mm2-V0.7.29-0

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxx> wrote:

> > So i don't really know how to go about this. I suppose i just run
> > PREEMPT kernels instead of PREEMPT_REALTIME. Maybe it's the overhead
> > which is killing jackd performance with PREEMPT_REALTIME, but i don't
> > believe so (50ms? nah!).
> 
> agreed, no way can 50msec be related to overhead.

there's one exception: if the RT workload is _just_ below 100% CPU
utilization, then PREEMPT_RT's overhead could push it above 100% and
trigger CPU overload, with big delays. What is the maximum CPU usage
during the test, while the system is otherwise idle?

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/