Bug 181913 - [x86_64] excessive debug messages kill 3D performance for i945G
Summary: [x86_64] excessive debug messages kill 3D performance for i945G
Alias: None
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: xorg-x11
Version: 4.0
Hardware: x86_64
OS: Linux
Target Milestone: ---
: ---
Assignee: X/OpenGL Maintenance List
QA Contact:
Keywords: Desktop
: 158016 (view as bug list)
Depends On:
Blocks: 181409
TreeView+ depends on / blocked
Reported: 2006-02-17 18:48 UTC by John W. Lockhart
Modified: 2007-11-30 22:07 UTC (History)
3 users (show)

Clone Of:
Last Closed: 2006-08-10 21:44:55 UTC

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2006:0412 normal SHIPPED_LIVE xorg-x11 bug fix update 2006-08-09 04:00:00 UTC

Description John W. Lockhart 2006-02-17 18:48:36 UTC
Description of problem:
When the i915 kernel module is present, Xorg turns on 3D features;
but this generates debug messages in mesa.  This turns glxgears
performance down to about 22fps from about 1000fps (accelerated)
or 800fps (unaccelerated).

Version-Release number of selected component (if applicable):

How reproducible:
Install xorg-x11 and related rpms, then boot with an x86_64 kernel
that has the i915 drm module.  Run glxgears from a terminal
and observe the spew.  Redirect stderr to /dev/null, hiding
the spew, and see the very low performance numbers... 
Actual results:

Debugging spew and awful 3D performance

Expected results:

No messages on stderr in the absense of errors,
and respectable 3D performance.

Additional info:
This issue was first raised in RHEL4-U3.  Xorg is covered
in bug 170517, and the kernel in 173882.

A patch exists here:

Kernel support for i915 under x86_64 needs to be added to trigger
this problem; bug 181912 covers that issue.

Comment 3 Mike A. Harris 2006-03-21 18:31:57 UTC
*** Bug 158016 has been marked as a duplicate of this bug. ***

Comment 5 Mike A. Harris 2006-03-28 18:01:42 UTC
Patch xorg-x11-6.8.2-mesa-i915-squelch-debug-spew.patch added to test
candidate for U4.

Please test the xorg-x11-6.8.2-1.EL.13.26 packages available for download via
FTP at:  ftp://people.redhat.com/mharris/testing/4E/xorg-x11

Comment 10 Mike A. Harris 2006-04-25 14:17:49 UTC
Setting bug to MODIFIED state as per comment #5

Comment 18 Red Hat Bugzilla 2006-08-10 21:44:55 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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