[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 #4 from lili <lilix.cheng at intel.com> ---
(In reply to Chris Wilson from comment #3)
> 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.)

This issue has been fixed with this patch.

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