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    SubjectRe: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    On Wed, 13 Jul 2005, Benjamin LaHaise wrote:

    > That's one thing I truely dislike about the current timer code. If we
    > could program the RTC interrupt to come into the system as an NMI (iirc
    > oprofile already has code to do this), we could get much better TSC
    > interpolation since we would be sampling the TSC at a much smaller, less
    > variable offset, which can only be a good thing.

    And we'd get a lot more crashes on broken systems that do not handle NMIs
    in the SMM -- this is the very reason the NMI watchdog is disabled these
    days by default. A whole lot of systems simply cannot handle NMIs
    happening randomly.

    Programming an I/O APIC to deliver the RTC interrupt (or any other that's
    edge-triggered) as an NMI is itself trivial (we can do this for the PIT
    for the NMI watchdog already).

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