Calling interested Glamo OpenGL developers (was: The forbidden topic: Glamo OpenGL)

Sascha Wessel wessel at
Fri Nov 21 02:18:25 CET 2008


On Fri, Nov 21, 2008 at 09:16:15AM +1100, Carsten Haitzler wrote:
> On Thu, 20 Nov 2008 19:00:02 +0100 "Nicola Mfb" <nicola.mfb at> babbled:
> > I wrote a small code snippet to test XCopyArea performance, and it seems to
> > do about 25fps smoothscrolling but at the cost of XGlamo using 70/80% of
> > CPU. This seems very strange, it maybe my code is wrong (I repeat I'm not an
> > expert :) ), or XCopyArea is not full accelerated, or Xglamo has to be
> > optimized, or that the Glamo GPU is simply slow :)
> it's accelerated - but likely polling the command queue status as you have no
> interrupts thanks to the linux kernel's policy of not exporting interrupts to
> userspace, so you're stuck with a poll loop. i can't remember if glamo had a
> "i'm done" interrupt for the command queue or operations - i know it had
> several interrupts it can generate (but as the kernel wouldnt allow userspace
> to make use of them i pretty much ignored them).


What's wrong with: interrupt handler -> wait queue -> file operations read/poll?


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