https://bugs.freedesktop.org/show_bug.cgi?id=36596

--- Comment #11 from Michel Dänzer <mic...@daenzer.net> 2011-05-09 07:04:50 PDT 
---
(In reply to comment #10)
> (In reply to comment #9)
> > Really sounds like the GPU IRQ doesn't work (reliably). Do the numbers on 
> > the
> > radeon line in /proc/interrupts still increase when the problem occurs?
> 
> Not a lot.  When everything's working, moving wobbly windows involves hundreds
> of interrupts.  When it's at 2 fps, there are only a few, at most.  Possibly
> none.

That probably explains the slowness, as the drivers heavily rely on the IRQ for
tracking GPU progress processing commands. With no interrupts coming in, things
will time out all over the place.

The question now is why there are no interrupts coming in...

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