| Summary: | UXA uses 2-3 times more CPU than EXA on intel graphics | ||
|---|---|---|---|
| Product: | xorg | Reporter: | kronheim |
| Component: | Driver/intel | Assignee: | Carl Worth <cworth> |
| Status: | RESOLVED FIXED | QA Contact: | Xorg Project Team <xorg-team> |
| Severity: | normal | ||
| Priority: | medium | Keywords: | NEEDINFO |
| Version: | 7.4 (2008.09) | ||
| Hardware: | Other | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
When I run that on my system, the CPU is entirely idle. zenity doesn't appear to do rendering over time. From playing mp3s with pavucontrol open, Xorg's CPU usage jumps to 20%. Does this match your experience with xf86-video-intel master? It should be the same performance as EXA now since: commit accdbd23676d812d2345f86d8e3ee62f108841ff Author: Carl Worth <cworth@cworth.org> Date: Fri May 29 15:34:20 2009 -0700 UXA: Rasterize trapezoids to system memory, not a pixmap feedback timeout, and the change should have fixed the issue. |
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I am using intel GM965 graphics with Ubuntu 9.0.4 and the intel driver version 2.6.3 (though the same results occur with 2.7.x as far as I can see). Steps to reproduce: 0. Specify UXA acceleration in xorg.conf 1. Open a terminal and run "top". 2. Open another terminal and do, for example $ zenity --progress --percentage=90 --width=600 so as to create a little bit of graphics activity. 3. Observe that xorg is using (perhaps) 19% of one core. Repeating the experiment with EXA shows only about 6-8% usage. Other simple things similar to progress bars use even more CPU under UXA. I noticed this first when using the volume control in pavucontrol: the bar indicating volume output levels moves back and forth and uses 50% of one core. My cpu is a Core 2 duo.