[Bug 72023] [HSW fbc bisected] cairo performance reduced over 60% by enabling FBC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72023

--- Comment #5 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #4)
> (In reply to comment #3)
> > Ville, I have the funny feeling that your FBC tracking fixes are required.
> > Of course, it still means we will have a similar impact on frontbuffer
> > rendering, but that is par for the course.
> 
> I wonder if we should follow the same model as the other drivers and only
> allow this kind of feature when runtime PM is enabled and/or when we're on
> battery...

Imo that's just chickening out of hard problems. PM features should be enabled
by default, and if they're causing issues due to overhead somewhere else we
need to look at that and fix it up.

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