[Bug 76892] [hsw] full debugging leads to long delays between TearFree updates due to an overloaded GPU!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76892

--- Comment #37 from Chris Wilson <chris at chris-wilson.co.uk> ---
Based on your debug logs so far I have spotted one missed optimisation
opportunity:

commit f0565852b668832d4988e875bc12e23abb6e1829
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Apr 3 16:27:47 2014 +0100

    sna: Short-circuit repeated clearing to the same color

    Spotted in amongst a KDE debug log was a series of clear; copy; repeat
    using Composite().

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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