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

    * 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
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