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    SubjectRe: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    On Fri, 15 Jul 2005, Andi Kleen wrote:

    > > That's like scratching your left ear with your right hand -- broadcasting
    > > that external timer interrupt in the first place is more straightforward.
    > > If you want to exclude CPUs from the list of receivers, just use the
    > > logical destination mode appropriately.
    >
    > The problem with that is that it would need regular synchronizations
    > of all CPUs to coordinate this. Not good for scalability and I
    > believe the fundamentally wrong way to do this.

    What to you mean by "regular synchronizations of all CPUs?" And how is a
    broadcasted external timer interrupt different from a unicasted one
    redistributed further via an all-but-self IPI, except from removing an
    unnecessary burden from the CPU targeted by the unicast interrupt?

    Maciej
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