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    SubjectRe: Linux 2.6.21-rc1
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    On Wed, 2007-02-21 at 10:23 -0800, Daniel Walker wrote:
    > Right, but eventually there isn't a regular timer interrupt through the
    > io-apic. I don't think in the past IRQ0 stops without the system
    > crashing, so check_timer() could assume the timer (IRQ0) is _always_
    > regular.
    >
    > do you know what the requirement are for routing the NMI through the
    > io-apic?

    Sorry. I checked. switching PIT off really breaks nmi_watchdog=1, as
    this just mirrors IRQ#0 to the NMI. No IRQ#0 from PIT, no NMI

    We could keep PIT running with an empty interrupt handler when
    nmi_watchdog=1 is set, but this interferes nicely with broadcasting.

    Does nmi_watchdog=2 work ? We might switch to that, when a local APIC is
    available.

    tglx



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