Re: Catching NForce2 lockup with NMI watchdog

[Jesse Allen <the3dfxdude@hotmail.com>]

On Fri, Dec 05, 2003 at 09:18:12PM +0100, cheuche+lkml@free.fr wrote:
> With a little patch in arch/i386/kernel/mpparse.c in the acpi section, I
> managed to get the timer interrupt back on IO-APIC-edge, maybe the nmi
> watchdog could work with the ioapic then ?

Maybe!  thanks!

> 
> With the patch, the interrupt flood on IRQ7 I reported on the nvidia2 
> lockups thread also disappeared, but then I noticed something odd when
> there is ide activity :

Yeah, I have been writing trace code to try to identify where it fails.  
Somehow what I did seem to have made IRQ 7 less noisy but I have no idea why? =)
So I do think the IRQ is related somehow...

> 
> There may be something wrong with the timer using apic and the
> amd/nforce ide driver does not handle this situation that should not
> occur and juste freezes. This is pure speculation of course.
> 
> *Disclaimer*
> The modification is certainly not the proper fix, does a wrong thing,
> but it shows an interesting behavior, especially it fixed the
> interrupt flood on IRQ7 I and some others are able to see.
> 
> Here the little patch of arch/i386/kernel/mpparse.c I used :
> 

I'll check it out.