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

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

--- Comment #39 from Simon Farnsworth simon.farnsworth@onelan.co.uk 2011-07-08 02:41:15 PDT --- (In reply to comment #37)

Maybe we should try and sort out why there is so much latency in the interrupt handler for Simon rather than rewriting the entire thing. Or we could just use the pflip interrupts where they are working and use the existing code on older asics.

I'm going to sprinkle DRM_DEBUGs in the IRQ handling path, see if I can find a smoking gun for latency, or if it's just lots of little things building up.