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SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?

* Alistair John Strachan <s0348365@sms.ed.ac.uk> wrote:

> > here's an updated patch - it will print out all timestamps too. (you'll
> > have to revert all previous softlockup patches first, via patch -R.)
>
> Yep, thanks, that fixed it. I don't know why it only shows up on my
> configuration, but it was a bug, and this patch fixes it. I also took
> the liberty of upgrading to -06 while I was doing it, so I think you
> can probably release -07 with the specified changes.

great.

> So far no lockups, either, but I'm not convinced they're gone forever.
> I'll let you know how it goes.

the ACPI-idle bug's primary effects were the missed wakeups, but they
should not cause lockups, because timer interrupts should always occur
and should eventually 'fix up' such missed wakeups.

but there's another side-effect of the ACPI-idle bug: the ACPI code was
running with interrupts enabled and maybe the hardware locks up if
interrupted in the wrong moment. ACPI sleeps are sensitive things and
closely related to other IRQ hardware, which we all program with
interrupts disabled. So i'd not be surprised if the lockups were caused
by the ACPI-idle bug.

Ingo
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