On 02/20/2011 03:40 AM, Jim McCloskey wrote:
[...]
And it seemed to work. /var/log/Xorg.0.log reports that direct rendering and
acceleration are enabled. And glxinfo reports:
%glxinfo | grep -i opengl
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD CEDAR
OpenGL version string: 2.1 Mesa 7.10
OpenGL shading language version string: 1.20
But when I run glxgears, it reports 60 frames per second, which isn't exactly
the
level of performance that I had been hoping for. And given that, it's hardly
surprising that applications like Google Earth are unusable.
The 'glxgears' program is not a benchmark. There is a feature in the
radeon driver (vline) which limits the 'glxgears' maximum frame rate to
your monitor's refresh rate. Try a benchmark program, or a game that
displays the current frame rate (such as 'torcs'), to get a better idea
of the performance of the driver on your system.
I should point out that Gallium 3D support in Mesa for Radeon cards has
been making great strides since the beginning of the year. I use Radeon
HD 5750 in my desktop machine, and Mesa 7.11 (unreleased; obtained from
upstream, not Debian packages) provided me with a huge jump in
performance towards the end of January: one track I use in 'torcs' to
test performance jump from min/max frame rate of 18/35 up to 28/60.
Some recent commits caused a regression in performance, and I have not
received word from Mesa developers yet whether those changes are
desirable in spite of the performance issue, or whether they will be
taken back. But I am very happy with what I have been seeing lately.
Is there anyone who could give me some advice about what is missing here? Or
where would be a good place to ask?
One good place is the Phoronix Forums. There are trolls and flame wars
there, but there are also knowledgeable people (with regard to Radeon
hardware and drivers) who are very responsive. I do not participate
there (yet) since I only toy with this stuff in my spare time, and have
not (yet) been able to dive into it seriously.
When it comes to Evergreen (Radeon HD 5XXX) support and performance, the
newer your kernel and drivers the better.
HTH,
Dave W.
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