[linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

[Ingo Molnar]

* Andrew Morton <akpm at osdl.org> wrote:

> >  discovered I can reliably produce a large XRUN by toggling Caps Lock, 
> > Scroll Lock, or Num Lock.  This is with 2.6.8-rc1-mm1 + voluntary
> > preempt
> 
> That's odd.  I wonder if the hardware is sick.  What is the duration is the
> underrun?  The info you sent didn't include that.

no, it's the ps2 driver that is sick. The ps2 keyboard driver is one of
the few places that busy-polls for IRQ completion from within a tasklet
context for things like led switching (yuck) - this can cause many
millisecs delays on all boards i tried.

	Ingo