Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.1

[Ingo Molnar]

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> wrote:

> >does the ping phenomenon go away if you chrt both the networking IRQ
> >thread and both ksoftirqd's to above the RT task's priority?
> 
> For the most part, yes. I reran the test with -V0.7.7 and had
> continuous ping responses until the system locked up with yet another
> deadlock. This did NOT fix the display / mouse movement lockups. All
> IRQ and ksoftirqd tasks were RT 99 priority for this test. latencytest
> ran at RT 30 priority.

another method would be to set all smp_affinity values in /proc/irq/*/
to 1 (i.e. let CPU#0 handle all IRQs), and start latencytest on CPU#1,
via 'taskset'. In theory this should ensure that no hardirq workload
runs on CPU#1 and thus ksoftirqd would not be active there either. (with
the exception of kernel timers started on that CPU, by latencytest.)

	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/