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

    * Andrew Morton <akpm@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
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