[Bug 84501] [IVB/BYT/HSW Bisected]Synmark2_DrvCtx performance reduced 50%~80%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84501

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
So what is happening is that we are effectively leaking contexts, forcing us to
evict and stall.

git://people.freedesktop.org/~ickle/linux-2.6 requests

should contain the fix (in
http://cgit.freedesktop.org/~ickle/linux-2.6/commit/?h=requests&id=4a9a7642673ec3365ce6de7fb91238ab996ac1f0)
which should get full-ppgtt to within about 10% of aliasing-pgtt in OglDrvCtx.
(Since we allocate and clear the entire PDE upon context creation, there will
be measurable extra overhead.)

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