Bug 501182 - Very slow trapezoid rasterization
Summary: Very slow trapezoid rasterization
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-intel
Version: 11
Hardware: All
OS: Linux
low
medium
Target Milestone: ---
Assignee: Kristian Høgsberg
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2009-05-17 16:01 UTC by Clemens Eisserer
Modified: 2009-06-12 23:36 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2009-06-12 23:36:53 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)
sysprof profile of OOo moving simple chart arround (1.01 MB, text/plain)
2009-05-17 16:04 UTC, Clemens Eisserer
no flags Details
FireFox performance comparison of XAA, EXA and UXA (15.02 KB, application/octet-stream)
2009-05-18 19:32 UTC, Clemens Eisserer
no flags Details


Links
System ID Private Priority Status Summary Last Updated
FreeDesktop.org 21376 0 None None None Never

Description Clemens Eisserer 2009-05-17 16:01:49 UTC
Description of problem:

All applications which render a lot of trapezoids are quite slow when using UXA+KMS. I guess this is caused by the fix for bug 490839.


Version-Release number of selected component (if applicable):
kernel  2.6.29.3-140.fc11.i586
intel 2.7.0-4
xorg 1.6.1

How reproducible:
Always. Some applications suffer less, some a lot (OpenOffice 3.1, FireFox for some pages).

Steps to Reproduce:
1. Open an openoffice(3.1)-document 
1.2. Move e.g. a chart arround
2. Open a trapezoid-heavy page in firefox.
  
Actual results:
Very slow rendering of trapezoids, profilers show almost all time spent in pixman_rasterize_edges.
Because the amount of trapezoids is the same for EXA/XAA/UXA the only conclusion I can make is that memory access is uncached and therefor slowing that code down.

Expected results:
At least as fast as EXA

Additional info:
Intel-945GM

I reported this bug already upstream, however I am not sure its really their fault:
https://bugs.freedesktop.org/show_bug.cgi?id=21376

Comment 1 Clemens Eisserer 2009-05-17 16:04:14 UTC
Created attachment 344335 [details]
sysprof profile of OOo moving simple chart arround

Comment 2 Clemens Eisserer 2009-05-18 19:31:35 UTC
I did some firefox performance measurements using Trender.
XAA/EXA was on Fedora8 with intel-2.2.1
UXA was on Fedora 10 with KMS

The steady slowdown is concerning  :-/

Comment 3 Clemens Eisserer 2009-05-18 19:32:51 UTC
Created attachment 344509 [details]
FireFox performance comparison of XAA, EXA and UXA

Comment 4 Bug Zapper 2009-06-09 15:59:04 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.

More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

Comment 5 Clemens Eisserer 2009-06-12 23:36:53 UTC
This is an intel-bug, caused by rendering trapezoid to pixmaps instead of system memory. Should be fixed in 2.8 (pre releases).


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