Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8

[Ingo Molnar]

* Florian Schmidt <mista.tapas@xxxxxxx> wrote:

> Hi,
> 
> it seems that the pauses went away with that patch. [...]

great! I've uploaded -U8.1 with this fix included:

  http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.9-rc4-mm1-U8.1

> And on this bootup the pauses are still gone, but as soon as i echo'ed
> 1 into trace_enabled the mouse started to become very skippy (update
> freq at about 3hz). Keyboard is fine though.. putting trace_enabled
> back to 0 doesn't fix it. I suppose it's just a matter of time until
> the next lockup. We'll see though..
> 
> Syslog only sees critical section timing reports, no BUG's afaics.

note that the keyboard and USB interrupts are SCHED_OTHER by default, so
they could be delayed quite long depending on the workload. To avoid
that i'd suggest to:

        chrt --fifo --pid 30 `pidof 'IRQ 1'`
        chrt --fifo --pid 30 `pidof 'IRQ 12'`

(do this for every IRQ you have for input devices.) This puts them below
jackd's priority (which is FIFO 50 iirc) but above all SCHED_OTHER
tasks. The soundcard IRQ i guess you have chrt-ed already?

or did you have them on SCHED_FIFO already?

	Ingo
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