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    SubjectRe: [PATCH][RFC] per isr in_progress markers

    On Mon, 9 Sep 2002, Linus Torvalds wrote:

    > Remember: you'd be "improving latency" by taking several interrupts
    > instead of taking just one. And usually, if the system is really under
    > so much interrupt load that this would be noticeable, you want to try to
    > _mitigate_ interrupts instead of adding new ones.

    There's also the following effect that could generate additional
    interrupts: the *same* IRQ source that is currently executing might
    generate a (spurious but otherwise harmless) interrupt if we first ACK the
    card then ACK the APIC and then do processing. Our current way of masking
    interrupts in the IO-APIC at least leaves them pending there until the
    handler's main work loop is finished and mitigates irqs.


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