[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 #7 from Jason Ekstrand <jason at jlekstrand.net> ---
(In reply to Eero Tamminen from comment #6)
> Jason, any idea why the fix would drop GpuTest 0.7 FurMark performance
> couple of percent, but only on BXT?

Most likely because it does add a tiny bit of CPU overhead.  I thought about
how to reduce the CPU overhead of this code but it's not incredibly obvious how
to do it.

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