[Intel-gfx] [PATCH] [RFC] drm/i915: read-read semaphore optimization

[Keith Packard]

On Tue, 13 Dec 2011 17:09:45 -0800, Eric Anholt <eric at anholt.net> wrote:

> We introduced this complexity with no evidence that it would help, just
> because we thought, like you, that "avoiding cache flushes should be
> good, right?".  Experiments so far say we were wrong.

Right, you'd think we'd have learned to not optimize in advance of
data. Someday maybe we'll know better...

And, of course, future hardware may require different code for optimal
performance. Who would have guessed that?

-- 
keith.packard at intel.com
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