[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 #11 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Wendy provided me data with execlists enabled (default) and disabled
(i915.enable_execlists=0 kernel command line option), for full SynMark test-set
with recent 3D stack.

Execlists is in no case faster.

It's ~50% slower in GL context re-creation test, and in other CPU bound tests
it's 5-10% slower:
- Batch5-7 (batching huge triangle strip with ever increasing number of draw
calls)
- DrvState (mostly CPU bound GL state change test)
- Multithread (GL calls from multiple threads)

Same difference both on BSW & BDW.

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