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    SubjectRe: [Bug #12152] Huge wakeups number from i1915
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    On lun, 2008-12-08 at 07:24 +0100, Yves-Alexis Perez wrote:
    > On dim, 2008-12-07 at 15:12 -0800, Arjan van de Ven wrote:
    > >
    > > > > at least in some of the cases where this has been seen the cause
    > > is
    > > > > the following:
    > > > > The i915 DRM driver used to do polling for completion, busy
    > > > > waiting. It moved to be interrupt driven, which is usually better
    > > > > for power, but it will show up as more wakeups in powertop....
    > > >
    > > > IOW, this is not a regression?
    > >
    > > I don't know about this specifc case (not enough information) but for
    > > the case I described it's not a regression. Going to interrupt driven
    > > from busy waiting is an improvement not a regression :)
    >
    > Well, several thousand or more interrupts really seems like a
    > regression :). But it seems that's the same thing as the “IRQ
    > spinning” (there was a thread on dri-devel about that).
    >
    > It seems fixed with a patch from Matthew Garrett applied to
    > drm-intel/for-airlied but I don't think this has been applied to Linus
    > master.

    And it seems the same thing as
    https://bugs.freedesktop.org/show_bug.cgi?id=18609

    Cheers,
    --
    Yves-Alexis
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