Re: Horrible ordeals with ACPI, APIC and HIGHMEM (2.6.0-test* and -ac kernels)
From: Chris Wright
Date: Thu Oct 09 2003 - 16:59:34 EST
* Martin Aspeli (optilude@xxxxxxx) wrote:
> On Thu, 9 Oct 2003 14:05:23 -0700, Chris Wright <chrisw@xxxxxxxx> wrote:
> > Which 2.6.0-test kernels? Have you tried 2.6.0-test7? A fix for this
> > type of problem went into -test7.
> Sadly, yes. My most recent and most comprehensive tests (today) were with
> the -test7 kernel. Could you give me some details as to what the fix is
> supposed to do and why it may not work?
fixes acpi pci link allocation which could pick a bad irq causing an
interrupt storm. typical symptom was hang on boot.
If you see:
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 6 7 10 *11 12)
ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 6
where the link is not enabled at the current setting (11 in this case,
marked by *), you might experience this kind of hang.
> Also, I'd still be interested to know - what is "events/0"?
events/0 is a kernel thread (keventd) used for scheduling work into process
context. acpi uses keventd for handling acpi events, for example, so
runaway apci events will cause events/0 to chew up cpu.
> And why do
> things run like a 286 when I enable HIGHMEM?
I don't know, it shouldn't.
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