Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.51-08

Ingo Molnar
2005-07-08T09:46:54Z

* Ingo Molnar <mingo@elte.hu> wrote:

> > > -51-06 and -51-08 are looking stable on the UP Athlon box with the
> > > following patch which causes edge triggered hardirqs to be masked when
> > > pending _and/or_ disabled (instead of both pending _and_ disabled) and
> > > backs out a change from -50-44 that prevents pending edge triggered
> > > irqs from being unmasked:
> >
> > ok, you are right, the edge case was mishandled - but i think it was
> > already mishandled upstream, we just never (or rarely) triggered it.
> > I've reworked this area based on your patch, could you check -51-15,
> > does it work for you?
>
> if it doesnt work, could you disable CONFIG_X86_IOAPIC_FAST?

or rather, please try -51-16. One of my testsystems produced weird
interrupt storms, which were caused by the IOAPIC_POSTFLUSH
optimization. In -51-16 i've turned that optimization off, globally.
Maybe this explains some of the other lockups reported.

Ingo