syscons + mouse == stuttering playback

[Alexander Leidinger]

Quoting Ulrich Spoerlein <uspoerlein at gmail.com> (from Thu, 26 Jul 2007  
19:31:30 +0200):

> On Sat, 14.07.2007 at 21:09:26 +0200, Tijl Coosemans wrote:
>> 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.
>
> Another interesting datapoint: playback over HPS' uaudio(4) is *not*
> affected. Perhaps the problem is specific to Intel ICH audio?

Is PS/2 giant free? If not the assumption about a problem because of  
giant may be true...

Bye,
Alexander.

-- 
I just had a NOSE JOB!!

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