Bug#620858: slow performance continues

Alex Deucher alexdeucher at gmail.com
Tue Apr 5 06:45:44 PDT 2011

On Mon, Apr 4, 2011 at 8:01 PM, Andres Cimmarusti <acimmarusti at gmail.com> wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:6.14.0-1
> Followup-For: Bug #620858
> I set vblank_mode=0 using a .drirc file in my home directory. This
> caused the overall slow down I was only experiencing after resuming from
> suspend to manifest itself all the time. Framerate in glxgears was no
> longer in sync with refresh rate, but it was quite poor (<200 fps). In
> the past I've gotten more like 800 fps (radeon) and 1200 (catalyst on
> lenny). Also, only by moving the cursor with the touchpad, causes the
> framerate in glxgears to drop further.

gears is not a benchmark.  It's highly CPU dependant.

> Desktop experience is quite slow. I pulled mesa 7.10.1 from experimental
> to see if this would help, but it didn't. The good news is that, after
> waking from suspend graphics performance is the same.
> Also I would like to correct a statement I made on my first email.
> Restarting X does not fix the problem (when vblank_mode is NOT set to
> zero).
> $ glxinfo | grep renderer
> OpenGL renderer string: Gallium 0.4 on ATI RS480

Since you are using gallium make sure it is built with llvm support as
that is very important for asics without vertex hardware.  You can
also disable tear-free buffer swaps by adding:
Option "SwapbuffersWait" "FALSE"
to the device section of your xorg.conf.  That coupled with
vblank_mode=0 should give you maximum framerates at the expense of


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