[Bug 103314] Strange slow-fast performance latching between gfxbench3 (and 4) test runs

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Oct 18 14:28:51 UTC 2017


https://bugs.freedesktop.org/show_bug.cgi?id=103314

--- Comment #7 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Tvrtko Ursulin from comment #6)
> On that machine I have the Intel DDX with DRI 3 turned on, and Mesa confirms
> it is using DRI 3.
> 
> Offscreen version of the test does not seem to suffer from this problem.
>
> So I guess user error of some sort?

I think the dual results issue we've discussed is still real.

You could test also with modesetting, to make sure blitter usage really goes
away, and if yes, whether that makes the performance results more consistent
(mostly/partly CPU bound tests like gl_driver are still going to have at least
5x more variance than GPU bound tests have).

Even if the cause would be Intel DDX instead of Mesa, it's quite suspicious
that it would randomly use blitter for frame copies.

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