KDE 4.3 X and plasma-desktop CUP usage

[Emmett Culley]

On 09/01/2009 10:24 AM, Emmett Culley wrote:
> Since upgrading to KDE 4.3 on Fedora 11 I have noticed that  X CPU usage
> gets up to 99% of CPU usage and plasma-desktop stays around 20% CUP
> usage.  If I shut everything down on the desktop the usage for both
> remains at 80 - 99% and 15- 20%.  If I end the session (ctl-alt
> backspace) both X and plasma-desktop drop off to nil CPU usage.
>
> Upon restart of KDE CPU usage for X and plasma-desktop is sometimes
> normal (low) after the system settles, and some times not.  But in all
> cases, after some time the CPU usage for X and plasma-desktop climb back
> up to 80 to 90% for X and 15 to 25% for plasma-desktop.
>
> Anybody else seeing this?
>
> Emmett
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>
After more experimenting I've found the following:

Each time I reboot my system, CPU usage for plasma-desktop and X is high (as described above).

If I log out (via the Leave menu) and log back in, the high CPU usages remains the same.

If I kill X (ctl-alt backspace) then log back in, the desktop comes back up with "normal" CPU usage for both, and it stays that way.

I have four CPU cores (two dual core Opterons), so the CPU usage is almost unnoticeable in the UI.  The UI is just sluggish enough to be noticeable.  But, it wasn't until I noticed consistently high CPU usage in Gkrellm that I began to investigate.

Emmett