[Bug 87725] [BDW Bisected] OglBatch7 performance reduced by ~7% after enable execlists

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87725

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
Looking at my bdw-u system, the effect here seems to be attributable to the
increased latency of execlist submission to an idle GPU compared to legacy -
and that we are doing just enough work inside the execlist handler for the GPU
to become idle between batches. On my machine I can get comparable timings
between execlists and legacy by tuning the driver, but if my hypothesis is
valid such tuning will be highly dependent upon the system.

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