compiz team mailing list archive

[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

The first, primary problem, with an expensive XSync is now fixed. But
that's not enough to solve the bug adequately. Here are my comments from
the tail end of that fix yesterday...

OK, I've tracked down the main offenders that remain _after_ this fix.

1. XSync() inside PrivateWindow::updateRegion()
2. XShapeGetRectangles() inside PrivateWindow::updateRegion()
3. XShapeGetRectangles() called from decor.

If you remove those from the equation then there is no longer a complete
freeze. But it still stutters. Further analysis then shows compiz
spending its time in one of:

(a) XSync in PixmapBinding::bind
(b) bindTexImageGLX
(c) PrivateVertexBuffer::render

I should add that reverting to the old asynchronous damage handling does
not help at all with stutters/freezing. The main issues are those listed
above.

It looks to me like our XShape support could be made more efficient
instead if synchronously querying XShapeGetRectangles all the time.

-- 
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https://bugs.launchpad.net/bugs/1027211

Title:
  [nvidia] Moving or resizing windows freezes and stutters on nvidia
  (especially if some other window is redrawing).

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