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SubjectRe: Catching NForce2 lockup with NMI watchdog
On Fri, Dec 05, 2003 at 11:11:39AM -0800, Allen Martin wrote:
> > -----Original Message-----
> > From: Mikael Pettersson [mailto:mikpe@csd.uu.se]
> > Sent: Friday, December 05, 2003 4:15 AM
> >
> > > So does this confirm that the lockups with nforce2
> > chipsets and apic
> > > is actually a hardware problem after all?
> >
> > Confirm with very high probability. There may be quirks in nVidia's
> > chipset that we (unlike their Windoze drivers) don't know about.
> >
> > Ask nVidia for detailed chipset documentation. Then maybe we
> > can fix this.
>
> NVIDIA doesn't provide a windows driver to setup APIC interrupts. APIC
> functionality is exported through the ACPI methods and MP table in the
> system BIOS which the motherboard vendors supply.
>
> Likely the root of the problem has to do with the way the Linux kernel is
> using the ACPI methods to setup the interrupts which is different from win
> 9x/2k/XP. I can help track this down, unfortunately so far I've been unable
> to reproduce the hangs on any of the boards I have.
>

Do you know whether the nforce2's with apic support the timer (IRQ 0) in
IO-APIC mode? To me, it seems like a bug:
"Dec 4 20:13:11 tesore kernel: ..MP-BIOS bug: 8254 timer not connected to
IO-APIC"
(This message originates in arch/i386/kernel/io_apic.c)

nmi_watchdog doesn't seem to work at all because of this. If it was working,
then maybe I can catch the lockup, because if it's like you say, it's probably
the kernel not hardware.

Jesse
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