Re: IO-APIC on nforce2 [PATCH] + [PATCH] for nmi_debug=1 + [PATCH]

From: Craig Bradney
Date: Mon May 10 2004 - 07:08:34 EST

On Mon, 2004-05-10 at 13:37, Ross Dickson wrote:
> Craig Bradney wrote
> >Well.. 2.6.6 is released.. and THANK YOU Linus and all the patch
> > writers.. we have nforce2 fixes in the released kernel now. I'm just
> > waiting for a gentoo-dev-sources release now..
> >
> >
> >
> >Craig
> ALMOST complete nforce2 support. Job not done yet.

I was waiting for that...

> Unfortunately 2.6.6 still has the old check_timer code which inhibits
> nmi_watchdog=1 on all nforce2 from working by having timer_ack=1
> when checking io-apic pit routing.
> It is a hardware issue - NOT A BUGGY BIOS ISSUE inside the integrated
> nforce2 interrupt routing.
> after reading the 8259 datasheets I think it is a mistake within the
> existing code to have the timer_ack on there in the first place.
> I would still like to see Maciej's check_timer patch in the kernel. It was
> pulled after only a single user mobo complaint was posted yet it helps
> both nforce2 and ibm bios pc's. To my knowledge little effort was made
> by that user to accomodate the patch - it was just outright pulled in spite
> of its benefit to others?
> Who do we ask to revisit this? Linus? the io-apic.c maintainer? or the one
> user with a complaint?
> That patch that was dropped by Linus? after appearing in 2.6.3-mm3.
> For those nforce2 users with problems of clock skew with the timer into pin0
> routing, that patch gave a virtual wire timer routing which worked well.

Why was it dropped?

> It also works around serious problems for ibm users who also want it in.

It looks like theres IDE caching problems with the new flushing
mechanism on Maxtor 8mb cache drives.. of which I have 2, so, looks like
I'm awaiting 2.6.7 now anyway or a patch to remove it.


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