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    SubjectRe: [PATCH 09/12] irq: implement IRQ expecting
    On 06/17/2010 01:43 PM, Alan Cox wrote:
    > On Thu, 17 Jun 2010 13:23:27 +0200
    > Tejun Heo <tj@kernel.org> wrote:
    >
    >> On 06/17/2010 01:12 PM, Thomas Gleixner wrote:
    >>>> Hmmm.... oh, I see. Wouldn't it be much better to use moving avg of
    >>>> IRQ durations instead of letting the driver specify it? Drivers are
    >>>> most likely to just hard code it and It's never gonna be accurate.
    >>>
    >>> Right, but that's probably more accurate than the core code heuristics
    >>> ever will be.
    >>
    >> Eh, not really. For ATA at least, there will be three different
    >> classes of devices. SSDs, hard drives and optical devices
    >
    > At least four: It may also be battery backed RAM.

    Yeah, right, there are those crazy devices too but I think they would
    fall in a single tick any way. At any rate, let's say I have those
    numbers, how would I feed it into c-state selection?

    Thanks.

    --
    tejun



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