[Bug 72906] [IVB/HSW bisected] 3D performance (e.g. padman, somkin-guns,urbanterror) reduced by 20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72906

--- Comment #12 from Eero Tamminen <eero.t.tamminen at intel.com> ---
There were quite a few changes between 18th and 24th of December (tests for
different HW happened at different times) in performance in the QA numbers, so
I'm not completely sure which of these are relevant for this bug, and which are
e.g. for bug 73213.  Anyway, here are the observations from the numbers:

Performance regression visible in the numbers for 2013-12-19 test is largest
for HSW mobile with GT3e, every test has regressed, by 2 - 50%, with
GLBenchmark 2.7 Egypt HD suffering most, then Smoking Guns and Padman etc.  All
of these are very high FPS benchmarks.  HSW GT3 Ultrabook numbers regressed
almost as badly.

HSW GT2 desktop numbers regressed by 0 - 10% (+ one x11perf test 20%).

IVB Desktop numbers regressed by -1 - 30%, with worst regressions being for the
programs mentioned here.

(In BYT case, regression is largest for GpuTest volexplosion (-16%), which test
is 100% pixel shader, not memory limited, and has very low FPS.  That seems
unrelated issue.)

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