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    SubjectRe: NMI problems with Dell SMP Xeons
    "Brendan Trotter" (on Wed, 7 Jun 2006 15:18:57 +0000) wrote:
    >On 6/7/06, Keith Owens <> wrote:
    >> This problem is not KDB specific, although that is where it was first
    >> noticed. Any code that sends a broadcast IPI 2 or an NMI IPI will
    >> crash these Dell boxes when there is a mismatch between the cpus known
    >> to the BIOS and the cpus known to the OS.
    >I missed this (broadcast IPI 2 causing problems)...

    It turns out that there is an uncommented hack in x86_64's version of

    case NMI_VECTOR:
    icr |= APIC_DM_NMI;

    That hack is not in i386, which means that IPI 2 does different things
    in i386 vs. x86_64 mode on the same hardware. I am still tracking down
    all the differences before doing a clean up patch that makes i386 and
    x86_64 behave the same.

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