Performance improvements on X600

[Marek Wawrzyczny]

On Sat, 23 Jun 2007 22:54:15 Jerome Glisse wrote:
> On 6/23/07, Marek Wawrzyczny <marekw1977 at yahoo.com.au> wrote:
> > On Sat, 23 Jun 2007 20:04:29 Jerome Glisse wrote:
> > > On 6/23/07, Marek Wawrzyczny <marekw1977 at yahoo.com.au> wrote:
> > > > Hi all,
> > > >
> > > > I use the r300-driver (with xorg-server 1.3.0.0 branch) and xeffects
> > > > overlays on Gentoo which appears to pull sources from the latest git
> > > > masters branch (I'm a bit weak on git terminology).
> > > >
> > > > As of 22/06/2007 21:00 AEST, compiz desktop seems to have received a
> > > > significant performance boost. For example, the cube effect which
> > > > usually taxed the CPU at nearly 90% (in performance mode) is now
> > > > almost insignificant (8%-15% with CPU utilization in the powersave
> > > > mode!) which leads me to believe that something must have changed in
> > > > the radeon driver or drm in the last 48 hours to offset most of the
> > > > work onto the GPU. Impressive.
> > > >
> > > > I also have a quetion about the OpenGL depth feature for the r300
> > > > chipset. At present it's not supported. This causes any OpenGL window
> > > > Is there anything users can do to help bring this feature for the
> > > > r300 chipset?
> > > >
> > > >
> > > > Many thanks,
> > > >
> > > > Marek Wawrzyczny
> > >
> > > My guess is that some change in mesa or compiz give you this
> > > improvement, did you upgraded mesa too ? If so it would be nice
> > > if you can git bisect btw today fast version and lastest slow version
> > > you know off.
> >
> > Yes, upgraded both and both had git updates. I did my update around
> > 22/06/2007 21:00 AEST, the previous update would have been applied 24
> > hours earlier.
>
> man git-bisect will tell you everythings you want to know. In this
> case we are not looking for a bug but for change that triggered
> this improvement.

Thanks, I'll look into it.

> > > I am not sure i understand what you mean by depth feature ?
> > > Depth buffer is supported on r300, last things not supported
> > > in r300 about depth is z write from fragment program, is it
> > > what you are talking about ?
> >
> > Sorry, just not that familiar with terminology. I thought that I've seen
> > this described that way somewhere.
> > The symptom is that if you have a window with OpenGL content below
> > (hidden) by other windows, it's OpenGL content shows through on top.
>
> I think you are talking about transparency, could you give a pointer
> to which application you see this feature lacking ? Transparency
> should be well supported by r300 but compiz & AIGLX might be
> a bit slow at doing it.

Pretty much everything, KDE's screensaver Control Centre console, Kaffeine 
when OpenGL backend is selected for video playback, glxgears... I've never 
actualy not seen this behavior with AiGLX.

Marek