syscons + mouse == stuttering playback

Ulrich Spoerlein uspoerlein at
Sat Jul 14 18:44:18 UTC 2007

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).

Ulrich Spoerlein
"The trouble with the dictionary is you have to know how the word is
spelled before you can look it up to see how it is spelled."
-- Will Cuppy

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