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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Eero Tamminen from comment #6)
> Looking at the numbers, this seems to have been fixed on 23rd?  If this is
> the case, please mark bug fixed, so that it can be verified.

Nope. The bug is a transient leak of the vm space and remains unfixed. Given
sufficient stress, all that is required is for a client to open/close many
contexts, and the aperture will be filled with inactive contexts until we are
forced to evict all the inactive contexts to make space for a new one. Whether
or not it impacts synmark, we can and should write an igt to try and
demonstrate the DoS.

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