Bug 15289

Summary: [Intel] Java2D extremly slow with EXA enabled
Product: xorg Reporter: Clemens Eisserer <linuxhippy>
Component: Driver/intelAssignee: Wang Zhenyu <zhenyu.z.wang>
Status: RESOLVED DUPLICATE QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Clemens Eisserer 2008-03-31 10:07:23 UTC 
configuration: 945GM laptop, X.Org X Server 1.4.99.901 and xf86-video-intel-2.3-rc2:

All applications using Java2D become extremly slow when EXA is enabled.
A good example is Java2D where many benchmarks scored 700fps with XAA, but now only with a few FPS. Furthermore the whole UI becomes very unresponsive.

Howto reproduce:
1.) Start Java2Demo:
java -jar /usr/java/jdk1.6.0_10/demo/jfc/Java2D/Java2Demo.jar (make sure to have an official java version, not classpath, gij, icedtea or whatever)
2.) Click on the "Lines"-Tab
3.) Double-Click on the rotating arrow (maximizes them)
4.) set anim-delay to zero (slider on the right)
5.) enable/disable antialising (without antialiasing this is opaque, simple X11 core rendering).

This is just a single example where the intel/exa driver performs very poor, but also simple 2D applications that consist only of a few buttons become sluggish.
Comment 1 Wang Zhenyu 2008-04-01 22:08:42 UTC 
Could you do some profile to see what slow things down?
Comment 2 Clemens Eisserer 2008-04-02 05:52:41 UTC 
The machine died on Tuesday and won't be available for testing for several weeks.

However it should be fairly easy to repeat the suggested steps (on a GMA950), and you should be able to see the reported slowdowns, which lead in this cause to an almost unresponsive application.

lg Clemens
Comment 3 Wang Zhenyu 2008-06-18 00:46:55 UTC 
Mark as dup with EXA performance bug in case java 2d has no specific other issues.


*** This bug has been marked as a duplicate of bug 13389 ***
Comment 4 Clemens Eisserer 2008-06-18 01:26:51 UTC 
Java2D relies a lot on readbacks, because it provides a lot advanced features but restricts (for now) itself only to X11-Core drawing.

Therefor I don't think those two bugs are duplicates, this one is specific to Java2D, the other reports general slowness.

lg Clemens
Comment 5 Chris Wilson 2012-07-21 13:46:51 UTC 
Clemens, feel free to ping me if you ever see X on your profiles or is limiting your performance.

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