[Bug 83482] [BDW Bisected] "bdw: Apply workarounds in render ring init function" reduced performance 10%~40%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83482

--- Comment #7 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to comment #5)
> We have also been discussing that the implementation of RPS on BDW is
> unreliable for benchmarking.

We're seeing same performance regression as PRC, it's 100% reproducible and I
don't see any frequency fluctuation.


(In reply to comment #6)
> (In reply to comment #4)
> > Created attachment 106370 [details]
> > v2: DEBUG: drm/i915: add i915.wa module parameter to control bdw workarounds
> > 
> > Fixed version.
> I have tried patch:attachment 106370 [details],this issue still exist.

Which "i915.wa" parameter values you tested?

(If you aren't seeing any changes when you disable all of the workarounds with
it, you've bisected wrong commit.)

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