[Xorg-driver-geode] Driver Perf LX800

[Huang, FrankR]

Chris,

            If using "x11perf -rgbftext" test, it will give lx_check_composite a call with pSrc(ARGB) and pDst(ARGB) that we can't handle.

            So I think this part acceleration is not possible in our driver. Right now, with my patch, we can accelerate with "-aa10text" and "aa24text". We accelerate the PictOpAdd with pSrc(A8) and pDst(A8).

            If you care only the "-rgbftext", we have no way now; otherwise, you can use my patch to give a glyph performance advanced.

 

Thanks,

Frank

 

________________________________

From: Christophe Lindheimer [mailto:christophe.lindheimer at gmail.com] 
Sent: 2010?7?26? 21:51
To: Mart Raudsepp
Cc: Huang, FrankR; xorg-driver-geode at lists.x.org
Subject: Re: [Xorg-driver-geode] Driver Perf LX800

 

	
	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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