On Thu, Jul 7, 2011 at 8:02 PM, Andres Cimmarusti acimmaru...@gmail.com wrote:
I have also noticed this tearing. 2D Responsiveness can be
incredibly bad.
I found out sometime ago that it could be compositing that was messing
everything up. But I thought it was from the Desktop Environment point
of view, that is, for example, gnome's 2 metacity trying to put some
nice transitions when starting my computer (which sometimes worked,
but almost always didn't). I tried using the low resource option in
gconf, but that didn't help. So I switched to xfce 4.8 (Debian
testing). All desktop effects are off by default. And the problem
remained!
So finally after reading more stuff, I decided to disable composite
and aiglx in the xserver. I put a file:
/etc/X11/xorg.conf.d/composite.conf with the following:
Section Extensions
Option Composite Disable
EndSection
Section ServerFlags
Option AIGLX off
EndSection
After booting up again, performance was instantly better. I would say
this is a better solution than giving up performance using Option
EXAVSync True. Desktop is very responsive and videos playing without
tearing (both vlc and mplayer). Sadly the xorg log still shows aiglx
is enabled, even though the same log also acknowledges my
configuration file and disables it early on.
So far, performance has been good and no problems, but have I truly
disabled compositing? or is it still lurking around refusing to be shut
off?
AIGLX has nothing to do with composite. You've disabled composite by
disabling the extension. You can also disable composite in your
window manager (e.g., metacity). EXAVSync will hurt performance since
all updates to the front buffer will stall the engine until scanout is
past the destination region. It's not really recommended. Ideally,
you'd use a GL compositor with vsync enabled.
Alex
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