[Bug 68807] [snb regression] retuned rc6 values cause power regression

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68807

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
So if you apply http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=perf
(and build with i915.ko builtin), use xf86-video-intel-2.15+ with SNA, and the
lastest checkout of intel-gpu-tools, you get not only a new set of *rps* tweaks
but also intel-gpu-overlay to show realtime GPU usage and power consumption.
I'd be interested in seeing how the rps tweaks interact with your system (for
libva, I can only imagine things get worse).


[Not yet integrated into intel-gpu-tools is the ability to record a power usage
profile for later analysis - it should be possible through perf, but I haven't
finished checking to make sure it works.]

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