[Bug 87726] [BDW Bisected] OglDrvCtx performance reduced by ~30% after use true PPGTT in Gen8+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87726

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
>From recollection, OglDrvCtx had perf regressions (and distinct rate-limiting
steps) in mesa, dri[2,3] and the kernel. It was basically a glClear benchmark
across lots of contexts, which in many respects shows the same characteristics
as lots of clients. That is a level of integration testing above igt. Showing
the scaling characteristics of the kernel wrt to the number of contexts (be
they one fd or many) does have coverage in igt.

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