Am 27.11.2011 16:13, schrieb Maarten Maathuis:
On Sun, Nov 27, 2011 at 3:55 PM, Christoph Bartoschek
<bartosc...@or.uni-bonn.de> wrote:
Hi,
I still have a huge performance problem with Xorg. One application that
painted 2 Mio rectangles on the screen within a second or so with XFree86
needs about a minute with Xorg.
Most of the time is spent in libpixman. I've added some debug statements and
see that pixman_raster_op is called about 7.2 mio times during my testcase.
I do not think that pixman itself is the problem. It is just used too often
by EXA.
Is there anything I can do about this? Is there a better list where I can
ask? Or do you know a person that might be interested in solving such a
problem?
Christoph
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As far as i know it basically boils down to this, rendering rectangles
is done in a software library as you observed. If your pixmap happens
to be outside normal ram then a lot of reads will kill performance.
These days the aim should be to use as little core rendering as
possible. A modern toolkit or a rendering library like cairo should
handle this far better.
How can I check whether the pixmap is outside the normal ram? For me it
does not look as if pixman is used for rendering the image. It looks as
if EXA is managing the region that needs updates with pixman routines.
But I could be wrong here.
Christoph
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