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Old 02-23-2010, 09:00 AM
jaivuk
 
Default F12 - Why is root having 2x better performance when running glxgears than "normal" user?

Hi guys,
I'm running kernel 2.6.31.12-174.2.19.fc12.i686 on Acer Aspire One.For the purpose of this test I disabled cpuscaling so CPU is running at the full speed 1600Mhz:

When I'm running*glxgears as normal user I get this stats:526 frames in 5.0 seconds = 105.186 FPS547 frames in 5.0 seconds = 109.283 FPS565 frames in 5.0 seconds = 112.826 FPS
521 frames in 5.0 seconds = 104.118 FPS562 frames in 5.0 seconds = 112.389 FPS558 frames in 5.0 seconds = 111.434 FPS
However when I'm running it as root I get:
1229 frames in 5.0 seconds = 245.583 FPS1220 frames in 5.0 seconds = 243.777 FPS1228 frames in 5.0 seconds = 245.375 FPS1225 frames in 5.0 seconds = 244.774 FPS
1182 frames in 5.0 seconds = 236.090 FPS1200 frames in 5.0 seconds = 239.892 FPS
I would expect some difference but not as huge (more than 2x).*Latencytop shows that glxgear spends most of the time on "Scheduler: waiting for cpu" in both scenarios.

I also tested gtkperf and I did not see the same behaviour - root was less than a second faster in overall test but normal user was faster in*GtkDrawing*tests.
Do you have any explanation for glxgears results?

Thank you,
Jaiv
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