Bug 539525

Summary:	Terrible performance with KMS
Product:	[Fedora] Fedora	Reporter:	Nenad Mikša <DoDoEntertainment>
Component:	xorg-x11-drv-ati	Assignee:	X/OpenGL Maintenance List <xgl-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	12	CC:	jglisse, xgl-maint
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-11-20 17:52:00 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:

Description Nenad Mikša 2009-11-20 13:29:10 UTC

Description of problem:
While using KMS, the rendering speed of xorg-x11-drv-ati driver is terrible. Glxgears shows only 700 FPS, and OpenOffice Impress animations are very slow or even freeze the system.
On the other hand, if booting with the nomodeset option, rendering speed increases a lot: glxgears shows 1700 FPS, and OpenOffice Impress works normally.

The graphics card is ATi Mobility Radeon X1600.


Version-Release number of selected component (if applicable): xorg-x11-drv-ati-6.13.0-0.10.20091006git457646d73.fc12.i686


How reproducible:
Acquire ATi Radeon X1xxx card, boot with KMS enabled and measure rendering speed. Then boot with KMS disabled and remeasure rendering speed.

Steps to Reproduce:
see How reproducible.
  
Actual results:
Rendering speed is slow.

Expected results:
Rendering speed should be at least as fast as without using KMS.


Additional info:

I supposed that KMS is designed to increase the graphics performance, not to decrease it. Am I wrong?

Comment 1 Jérôme Glisse 2009-11-20 17:52:00 UTC


*** This bug has been marked as a duplicate of bug 526967 ***