[Xorg-driver-geode] Driver Perf LX800

[Christophe Lindheimer]

>
>
> On E, 2010-07-26 at 14:31 +0200, Christophe Lindheimer wrote:
> > Hi.
> >
> > My prob is just that I had much better perfomances with my old
> > system...
> >
> Yes, and what are your typical use cases. What programs and operations
> are slow. Just the desktop environment in general, I assume.
>
Hard to say.
The issue I see is on a big soft running in full screen on a simple X
Server.
As I have a lot of text on the screen, I chose to test the -rgbftext
But my knowledge on X is rather limited...


> >
> > I run a x11perf -rgbftext.
> >  Old config :81300 / s
> >  New config : 36000 / s
>
> Are you sure -rgbftext measures what is important?
> I guess it measures no anti-aliasing text drawing, not sure how we fare
> there with the optimized code (that isn't in 2.11.8 or even GIT yet).
> Is your desktop really configured to no anti-aliasing at all? We
> typically benchmark the common case with x11perf -aa10text and x11perf
> -aa24text for anti-aliased text
>
> In the future it will be important for speed to not use subpixel
> smoothing (the anti-aliasing style, that takes advandance of the fact
> that LCD screens are made of red, green and blue subpixels), as that we
> won't be able to accelerate anytime soon (if ever).
>
> > But I guess (and hope) that Mart's analysis is OK and that the
> > performances will get much better once the driver will be fully
> > optimized...
>
> Meanwhile you can force most things to software with the option
>
> Option "MigrationHeuristic" "greedy"
>
> in your xorg.conf or xorg.conf.d/ (with xserver-1.8+ if migrated to that
> use already).
>
> That should give a bit better results until you are able to have more
> optimized driver.
>
>
> There are patches on the mailing list for making text go 5-10 times
> faster though. After those patches are finalized, we'll of course have
> work ahead on optimizing various other rendering of the desktop besides
> text drawing.
>
>
> Regards,
> Mart Raudsepp
>
>
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