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

[Ingo Molnar]

* Mark_H_Johnson@xxxxxxxxxxxx <Mark_H_Johnson@xxxxxxxxxxxx> wrote:

> >do you have PREEMPT_REALTIME enabled? The above trace is a direct
> >interrupt - only the timer interrupt is allowed to execute directly in
> >the PREEMPT_REALTIME model - things break badly if it happens for any
> >other interrupt (such as the soundcard IRQ).
> Yes I have PREEMPT_REALTIME enabled.
> 
> The thing that comes to mind is I do have a script that does
>   echo 0 > '/proc/irq/10/Esoniq AudioPCI/threaded
>
> as part of ensuring the all the preemption stuff was set right. I may
> have run that script prior to getting those messages. I thought you
> said before that the non threaded IRQ stuff was disabled. Perhaps this
> interface needs to be disabled as well [unless you really decide to
> fix this limitation...].

argh, there was a typo in that change so the 'threaded' flags werent
really disabled. So i ended up only disabling the global hardirq_preempt
flag but not the per-handler 'threaded' flags. Ouch!

I've uploaded the -U9.1 patch that has the fix, does it work any better
than previous kernels?

	Ingo
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