Xorg with ATI / RV370 sneakily eats half my CPU with empty screen?

[John Clarke]

Thanks to everybody for helping.

oprofile has a mystifying array of possible options to log, but the -b option to top and xrestop have helped shed some light.

The problem still occurs with the "vesa" driver - it looks like its the screensaver or screen locker.

I'll post again when I've got it figured out.

Regards
John

 
 
 

========================================
 Message Received: Jan 21 2009, 12:09 PM
 From: "Frank de Lange" 
 To: "John Clarke" 
 Cc: xorg at lists.freedesktop.org
 Subject: Re: Xorg with ATI / RV370 sneakily eats half my CPU with empty screen?
 
 
 John Clarke wrote:
 > Dear All,
 > 
 > Following an upgrade to Suse 11.1 I find that Xorg is eating my CPU alive.  Here's the output from "top":
 > 
 > 28834 johncc    20   0 1437m 615m 298m R 98.2 15.5 794:20.69 isis
 >  3103 root      20   0  748m 398m 7072 S  1.7 10.1   1080:03 Xorg
 > 
 > I don't know how the massive Xorg usage gets clocked up - I never see more than 1-2% used, but nonetheless next morning there it is and my batch jobs are taking twice as long to run.
 > 
 > There is no display stuff going on at all.  Screensaver is now a simple black screen (although that made no difference) and the batch jobs are compute only, no graphics.  Basically only the clock is changing.
 > 
 > Google didn't turn up anything useful - I don't even know how to increase the logging level to tell me what Xorg is doing.
 > 
 > Please help, I'm going mad.
 > Thanks
 > John
 
 Can you log in remotely to this machine so that you can observe X while
 it is in the screensaver? It sounds strange that you never observe more
 than 1-2% but it still seems to chew so much time. Maybe that simple
 black screensaver still makes X go bezerk...
 
 Cheers//Frank
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