[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 #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
We have also been discussing that the implementation of RPS on BDW is
unreliable for benchmarking. It would also be sensible to fix the frequency
whilst doing perf regression tests to rule out RPS fluctuations:

cat /sys/class/drm/card0/gt_max_freq_mhz  >
/sys/class/drm/card0/gt_min_freq_mhz

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