Performance improvements on X600

[Jerome Glisse]

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.

> > 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.

best,
Jerome Glisse