[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 #10 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Chris Wilson from comment #7)
> There are a number of patches to address this, with review outstanding. The
> regression here is due to the large number of context and list entries
> generated by OglDrvCtx. The patches try to compensate by making context
> creation quicker (the goal of that particular microbenchmark) and introduce
> hashtables to avoid the linear list walks.

Note: we stopped tracking that (SynMark v6.0) test last year when switching to 
SynMark v7.0 which didn't anymore include it.  For perf test it had
unreasonable amount of variance and it was acting more like a functional
test-case for kernel & compositor (particularly Unity/compiz), bugs that would
IMHO be better tracked by a specific, functional test-cases e.g. in IGT.

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