On Mon, Dec 08, 2008 at 08:28:07AM +0100, Rafael J. Wysocki wrote: > On Monday, 8 of December 2008, 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. > > Any pointers to the patch, please? Doesn't ring any bells for me... -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
