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    SubjectRe: Catching NForce2 lockup with NMI watchdog - found?
    We're all trying to get acpi, apic, lapic, io-apic working
    when turned on in cmos/bios and kernel.

    The three things that each alone have achieved stability
    on somebody's system here are 1) bios update 2) cpu
    disconnect off either in cmos if available or by athcool
    or kernel patch with same 3) timing delay patch

    For CPU disconnect you still need athcool or this one

    Both patches are for 2.6.0-test11 kernel.

    turn on ioapic edge timer--

    Other changes offer clues and expose symptoms but
    are not helpful or necessary after da fix is in. udma
    settings are a kludge of a error symptom, just aspirin.

    Other kludges are acpi off, local apic off in kernel,
    apic off in cmos/bios. These go away when the real
    problem is fixed.


    Craig Bradney wrote:

    >On Mon, 2003-12-08 at 04:21, Ross Dickson wrote:
    >>On Monday 08 of December 2003 04:08, Bob wrote:
    >> > >>Sounds great.. maybe you have come across something. Yes, the CPU
    >> > >>Disconnect function arrived in your BIOS in revision of 2003/03/27
    >> > >>"6.Adds"CPU Disconnect Function" to adjust C1 disconnects. The Chipset
    >> > >>does not support C2 disconnect; thus, disable C2 function."
    >> > >>
    >> > >>For me though.. Im on an ASUS A7N8X Deluxe v2 BIOS 1007. From what I can
    >> > >>see the CPU Disconnect isnt even in the Uber BIOS 1007 for this ASUS
    >> > >>that has been discussed.
    >> > >>
    >> > >>Craig
    >> > >
    >> > >I don't have that in MSI K7N2 MCP2-T near the
    >> > >agp and fsb spread spectrum items or anywhere
    >> >> else.
    >>>Use athcool:
    >>>or apply kernel patch (2.4 and 2.6 versions were posted already).
    >>Please take a look at
    >>Fixes for nforce2 hard lockup, apic, io-apic, udma133 covered
    >>in mailing list.
    >>I approached it from another angle regarding delaying the apic ack in local timer irq
    >>and achieved stability. It would be good to have others try it. Ian Kumlien is also
    >>reporting success so far.
    >Although I had long uptimes before.. and therefore might achieve them
    >again fairly easily.. I'm now on 2 days 10 hours which has included a
    >lot of compilation and a lot of idle time, and plenty of the hdpar and
    >grep tests. I have used only the IRQ0 IO-APIC edge patch.
    >Can someone please note all the patches for 2.6 that people have tried
    >and what they achieve? Im starting to get a bit lost, given the fact
    >that I'm running stable here with only 1 patch. (so far - this is where
    >it crashes after I click Send I suppose ;) )
    -local apic("lapic")


    kernel local apic issue and acpi and apic go together,
    but turning off lapic first might achieve stability for
    some, updating bios will enable using all bios and
    linux apic, acpi, lapic, ioapic for some(me twice).

    >-io-apic (IRQO set to XT-PIC incorrectly)
    udma133 may be a clue but I don't think anyone
    achieves stability one way or the other on that. I
    flogged every possible hdparm change and tried
    three brands of hd controller without every
    achieving stability, but once you're stable by
    using other means you can use 133 and unmask
    irq(not for siig sis?) and other hdparm opts.

    >-cpu disconnect patch (missing bios option for ACPI Cx states)

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