[Mesa-dev] [Bug 97549] [SNB, BXT] up to 40% perf drop from "loader/dri3: Overhaul dri3_update_num_back" commit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97549

--- Comment #6 from Eero Tamminen <eero.t.tamminen at intel.com> ---
With modesetting:

* BXT: similar to new X DDX, perf OK (somewhat below X DDX)
* SNB: perf still bad, but better than with Intel DDX

-> on SNB the attached patch is needed to get performance on previous level
regardless of DDX.

Backtraces are from BXT, both with old (last month) X Intel DDX, before and
after the commit.  Earlier dri3_update_num_back() was called when getting
buffers, now it's called when swapping.

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