Bug 181913

Summary: [x86_64] excessive debug messages kill 3D performance for i945G
Product: Red Hat Enterprise Linux 4 Reporter: John W. Lockhart <lockhart>
Component: xorg-x11Assignee: X/OpenGL Maintenance List <xgl-maint>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: rousseau, wingc, zcerza
Target Milestone: ---Keywords: Desktop
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2006-0412 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-08-10 21:44:55 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 181409    

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):
xorg-x11-6.8.2-1.EL.13.25

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:
https://bugzilla.redhat.com/bugzilla/attachment.cgi?id=124724

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.

http://rhn.redhat.com/errata/RHBA-2006-0412.html