[compiz] Strange behaviour in move plugin

[Erkin Bahceci]

I am experiencing something similar (very high cpu usage while moving
windows). I have Wobbly off. When I have a few windows open (trying
with firefox windows) and I restart compiz, everything works fine
(fine being xgl cpu usage remaining under 25% while moving a 1300x800
window on a 1680x1050 screen). The problem starts when I open a new
(firefox) window (of the same size). While I move this new window, xgl
cpu usage goes up to 80%. The old windows again cause only 25% usage.
When I restart compiz again, xgl cpu usage while moving every window
is again 25%. But opening new windows causes the same problem again.
So something must be missing or being done wrong when opening new
windows, that is being done properly when initializing windows that
were already open before compiz started.

When I enable Wobbly, the problem gets even worse. When compiz is
restarted, xgl cpu usage is < 35% while moving windows. When I open a
new window, this time *every* window makes the cpu hit 100% while
moving it, rather than only the new window. Because of the high xgl
cpu usage, Wobbly makes windows make abrupt and big jumps, sometimes
even moving a little in the opposite direction, too.

The problem is always repeatable and is pretty annoying.

This is with a Mobility Radeon x300 on fglrx btw.

Regards,
Erkin


On 4/5/07, David Reveman <davidr at novell.com> wrote:
> On Thu, 2007-04-05 at 18:55 +0200, Bellegarde Cedric wrote:
> > One of the two last commit to move plugin make windows movements really
> > strange and cpu usage really intensive...
>
> Strange in what way?
>
> One of the changes that was made is that the server side window position
> is now updated after each motion event. This shouldn't really affect
> performance by itself but the application, some pager or some other
> application might be doing something performance sensitive each time the
> position changes.
>
> I know that both gwd and kwd are doing a bunch of unnecessary work each
> time the position changes and I'll fix that sometime soon.
>
> There might always be applications that are doing a lot of unnecessary
> work each time the window position changes so having support for only
> updating the server-side position when we're finished moving a window is
> useful and I'll add that back to the move plugin later in a more
> appropriate way. The old way it was done was bad.
>
> - David
>
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