Re: radeon-pre-2

[Michel Dänzer]

On Mon, 2004-09-13 at 02:05 -0400, Alex Deucher wrote:
> On Sun, 12 Sep 2004 20:45:18 -0400 (EDT), Vladimir Dergachev
> <volodya@xxxxxxxxxxxxxx> wrote:
> > 
> > 
> > On Sun, 12 Sep 2004, Michel [ISO-8859-1] Dïnzer wrote:
> > 
> > > On Sun, 2004-09-12 at 23:42 +0100, Dave Airlie wrote:
> > >>
> > >> I think yourself and Linus's ideas for a locking scheme look good, I also
> > >> know they won't please Jon too much as he can see where the potential
> > >> ineffecienes with saving/restore card state on driver swap are, especailly
> > >> on running fbcon and X on a dual-head card with different users.
> > >
> > > Frankly, I don't understand the fuss about that. When you run a 3D
> > > client on X today, 3D client and X server share the accelerator with
> > > this scheme, and as imperfect as it is, it seems to do a pretty good job
> > > in my experience.
> > 
> > Not that good - try dragging something while a DVD video is playing.
> 
> The overlay could be converted to use the CP engine as well. right now
> it has to switch to MMIO for overlay.

The question is whether that matters at all, i.e. whether the registers
used for the overlay are FIFO'd.

Either way, I don't see how this is related to the way DRM context
switches are handled.


-- 
Earthling Michel DÃnzer      |     Debian (powerpc), X and DRI developer
Libre software enthusiast    |   http://svcs.affero.net/rm.php?r=daenzer
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