[Bug 354940] Re: [i915] UXA is very slow (UXA bug)

[Chris B]

With the following Intel controller on Jaunty/9.01:

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile
915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)

And updated kernel as recommended in http://ubuntuforums.org/showthread.php?t=1130582
Linux presto 2.6.30-02063003-generic #02063003 SMP Sat Jul 25 10:57:13 UTC 2009 i686 GNU/Linux

Intel driver from PPA  https://launchpad.net/~ubuntu-x-swat/+archive/x-updates/
Package: xserver-xorg-video-intel
Architecture: i386
Version: 2:2.7.1-0ubuntu1~xup~1

xorg.conf
Section "Device"
	Identifier	"Configured Video Device"
	Driver		"intel"
	Option		"AccelMethod"	"exa"
	Option		"EXAOptimizeMigration"		"true"
	Option		"MigrationHeuristic"		"greedy"
	Option		"Tiling"			"true"


I got the following results:

PPracer, fullscreen 1280*800: UXA 11-15fps, EXA 25-30fps
Fullscreen flash noticeably worse with UXA (tearing, dropped frames)

The same ratio results (UXA giving about half frame rate and worse 2D
video performance than EXA) was noted with the 2.4 Intel driver from
Intrepid, Jaunty stock 2.6.3 driver, and the X-updates 2.7.1 driver.
Performance with the downgraded 2.4 driver was noticeably worse (EXA).
Upgrading from stock 2.6.28.15 kernel to 2.6.30 gave about a 20%
improvement in framerate on ppracer.

Hope this information helps someone. However, to say that a fix is
released/bug resolved, when it's necessary to run an alpha of Karmic and
a git version of the intel driver, is stretching a point a bit. It looks
like most users will have to wait until the release of Karmic before
they can watch full-screen video on intel chips (and even then, it's
going to be marginal).

-- 
[i915] UXA is very slow (UXA bug)
https://bugs.launchpad.net/bugs/354940
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