Compiz or Firefox

Leonard Smith lenrsmith at
Thu Jul 31 13:19:36 UTC 2008

On Tue, 2008-07-29 at 21:49 +0200, Mario Vukelic wrote:
> On Tue, 2008-07-29 at 14:01 -0500, Leonard Smith wrote:
> > Yeah, let me clarify.
> Thanks
> >  I first noticed the problem with firefox and
> >   vmware. I quit using vmware (as it was virtually unusable) and tried
> >  virtualbox. Seemed fine, at first, but then started having the same
> >   issue with it. Now I've noticed it happen anytime I have two or more
> >  of these applications running at the same time.
> Ok, I start to see the picture now. 
> Can you rule out completely that if you run any one of these program on
> their own, the CPU issue does not occur?
> Did you maybe test by first running each program without the others,
> then running two of them in all possible pairings, and after that maybe
> even three of them in the possible triplets?
> I find it highly unlikely that arbitrary programs interact in such a
> way, after all their address spaces are kept separate by the kernel.
> IMHO the most likely culprit is one of the kernel modules. vmware has
> one, your graphics driver module has one (since you run hardware
> acceleration for compiz; if your card is not Intel, these drivers are
> also proprietary, making them impossible to debug for kernel
> developers). And Virtualbox also has one.
> You could try reducing these module to the minimum: unload the vmware
> module(s) and virtualbox module(s). Also, disable the proprietary driver
> for X (if you use one. this is easiest done from menu System >
> Administration > Hardware Drivers).
> Then try to trigger the issue with one, two, three of the programs
> running. I know it's a lot of work, but I have no idea how else to
> systematically narrow it down.
Thanks, I haven't had time to much more, yet, because of work. Once I
get a bit I plan to work on it. 

I also found this thread in the forums:

It sounds a very similar to my experience. I'm reading through it for
hints, too.

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