[Bug 67157] [Piketon bisected] x11perf –aa10text performance reduced by ~37% enabling SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67157

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
IPS is "Intelligent Power Sharing". It adjusts the performance of the GPU by
~2x in order to split power between the CPU/GPU based on demand, and takes a
good couple of minutes to respond. That is it takes several runs of a benchmark
on Ironlake in close succession for the results to stablise.

Hmm, it's strange that after 7b1a502 the degradation on my i3-330 was <1% (~7.9
to ~7.8 MGlyphs/s). But a 10% perf hit for a flushing correctness fix here is
not too bad - though I don't see why we would need to inject a flush between
glyph runs, so I will take another look.

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