[Bug 102258] Up to 20% perf drop in texture sampling tests with "i965/surface_state: Get the aux usage from the miptree code"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102258

--- Comment #6 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Jason Ekstrand from comment #4)
> This is fixed by the following commit in master:
> 
> commit 61d2f3f1c24323a1c067595ec78dfbfefdc72b41
> Author: Jason Ekstrand <jason.ekstrand at intel.com>
> Date:   Thu Aug 17 15:27:25 2017 -0700
> 
>     i965/miptree: Return NONE from texture_aux_usage when fully resolved

Jason, any idea why the fix would drop GpuTest 0.7 FurMark performance couple
of percent, but only on BXT?

(I saw it when using 1/2 HD windowed version, when running FurMark in FullHD
fullscreen, I wasn't able to bisect it.  There's also similar SynMark v7 PSPom
drop at the same time, but I wasn't able to bisect it with ezBench.

PSPom perf raised with the original bug 3-4%, but not FurMark one, that may be
due to hashing mode impact on FurMark.)

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