[Bug 36596] Major 2D performance bottleneck (most noticeable with compiz)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #12 from Jason Cassell <bluesloth600 at gmail.com> 2011-06-05 21:40:24 PDT ---
(In reply to comment #10)
> I can't make the "irq 19: nobody cared" problem happen any more.

I was wrong, it still happens.  I just don't know how to trigger it anymore.

When IRQ 19 is disabled, compiz runs at 2 fps all the time.  glxgears in compiz
reports about 300 fps, but most of those frames don't actually make it to the
screen.  glxgears in openbox runs normally at about 40 to 50 fps.  Actually,
most things seem fine in openbox, except xterms run slowly.

I'll go ahead and attach the actual error message, I guess.  I suspect it might
have more to do with the kernel or the hardware than mesa, but I don't know.

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