Re: Xfree86.0 high CPU in 1280x768

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On Tue, 6 Jun 2006, Barry Scott wrote:

> I'm seeing the X process take a lot more CPU time to run any workload in
> 1280x768 compared to a standard VGA mode like 1280x1024.
>
> For example running a text scrolling app (lots of XCopyArea calls) I see the
> following CPU usage figures:
>
> 1280x1024:  6.75%
> 1280x768:  10.53%
>
> top shows that the X process is the only one to show a change between
> the two modes.
>
> With XVIDEO apps the difference is from 50% to 70% to play a movie.
>
> This happens with the  i810 driver and the via driver so  I don't think
> its a driver
> specific issue. I think that X is changing its behavior.

   I seriously doubt that.

>
> Is it possible that X has turned off it acceleration in 1280x768 mode?

  "X" doesn't have anything to do with acceleration.  This is entirely
a driver/HW issue.


>
> What can I look at to find out what the problem is?

    Is your refresh rate the same in both cases?  Integrated
graphics have peculiar performance characteristics because the
graphics hardware shares memory bandwidth with the CPU.

		Mark.

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