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. Cheers, -- Yves-Alexis
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