syscons + mouse == stuttering playback

[Tijl Coosemans]

On Saturday 14 July 2007 20:44:10 Ulrich Spoerlein wrote:
> On Sat, 14.07.2007 at 18:46:13 +0200, Tijl Coosemans wrote:
> > On Monday 02 July 2007 20:51:09 Ulrich Spoerlein wrote:
> > > on a recent CURRENT, without WITNESS or INVARIANTS. Both with
> > > SCHED_ULE and SCHED_4BSD I observed the following:
> > > 
> > > Make sure almost nothing is running (to rule out other influences).
> > > Run mpg123 on some MP3 file. Then start moving the syscons mouse
> > > cursor. I get a high frequency stuttering on playback, playback is
> > > also slowed down.
> > 
> > I just noticed it. I was playing music in Amarok, switched to a text
> > terminal and moving the mouse there causes stuttering. In X it
> > doesn't...
> 
> Are you using an USB mouse? I do, perhaps it is caused by the Giant
> lock? I can't test with a PS/2 mouse, but perhaps I could run a test
> with Hans' USB stack (giant free).

Yes, usb mouse, but this laptop touchpad (PS/2?) has the same effect.