[Bug 38800] glXSwapBuffersMscOML is slow on AMD Fusion but not on Intel 945 w/Atom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38800

--- Comment #44 from Simon Farnsworth <simon.farnsworth at onelan.co.uk> 2011-07-08 07:17:59 PDT ---
Created an attachment (id=48898)
 View: https://bugs.freedesktop.org/attachment.cgi?id=48898
 Review: https://bugs.freedesktop.org/review?bug=38800&attachment=48898

The register access guards patch as applied by hand

Michel's register guards patch didn't apply cleanly to the drm-fixes kernel I'm
using; the attached is what I ended up running with.

I can confirm that it fixes this bug.

Michel, there's one change I've made that's beyond what you did: in the old
pageflip function, the ring lock and unlock pair were needed to emit the fence
to hardware. In your version, where the fence isn't emitted, you don't need the
ring lock/unlock pair.

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