Bug 22935 - QGears in GL mode causes desktop to "stutter"
Summary: QGears in GL mode causes desktop to "stutter"
Status: RESOLVED FIXED
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Eric Anholt
QA Contact: Xorg Project Team
URL:
Whiteboard:
Keywords: NEEDINFO
Depends on:
Blocks:
 
Reported: 2009-07-24 07:13 UTC by Clemens Eisserer
Modified: 2009-10-31 12:01 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
Xorg log (44.40 KB, application/octet-stream)
2009-07-24 07:13 UTC, Clemens Eisserer 		no flags Details
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Description Clemens Eisserer 2009-07-24 07:13:45 UTC 
Created attachment 27979 [details]
Xorg log

When running QGears in gl mode ("./qgears GEARS -gl") it seems to occupy the GPU so much that other 2D applications get too little GPU time to be able to respond as usual.
The desktop is hardly useable with this OpenGL app running.

QGears2 is a small Qt based benchmark and can be downloaded here:
http://ktown.kde.org/~zrusin/examples/qgears2.tar.bz2

My system:
- Fedora rawhide
- Xorg 1.6.99.1
- Kernel 2.6.31-0.42.rc2.fc12.i586
- Intel 2.8
Comment 1 Eric Anholt 2009-10-23 15:14:24 UTC 
qgears does try to fill the GPU without stopping, so things will be less responsive than not running it.  However, I wonder if you might be running a Mesa without the frame throttling fix in 7.6, since you didn't mention what version of Mesa you're using.  My desktop is reasonably responsive when running this demo.

commit 0828579a658af01a64b5e699175dc9bbbedcd685
Author: Eric Anholt <eric@anholt.net>
Date:   Tue Jul 21 11:23:18 2009 -0700

    intel: Wait on the last swapbuffers to complete before queuing a new one.
Comment 2 Clemens Eisserer 2009-10-31 11:55:40 UTC 
Yes, seems to work fine on latest fedora rawhide.

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