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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Piketon bisected] x11perf –aa10text performance reduced by ~37% enabling SNA"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67157#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Piketon bisected] x11perf –aa10text performance reduced by ~37% enabling SNA"
href="https://bugs.freedesktop.org/show_bug.cgi?id=67157">bug 67157</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>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.</pre>
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