[LAD] 2.6.20 scheduler and buffer underruns

[Lee Revell]

On 7/12/07, Darren Gibbs <tsquank at yahoo.com> wrote:
> So the story is more interesting now... with SCHED_FIFO I'm seeing
> occational delays of about 60 sample frames (@44K) when there is very
> little other CPU activity.  It still looks like a buffer underrun in
> that the audio data is contiguous on both sides of the delay, so I'm
> not dropping a buffer.  When I load the CPU with another task doing a
> while(1) loop, the glitches go away.  Hmmm....
>

You will probably need to run an -rt patched kernel to get acceptable
performance from JACK.  This also includes a cool latency tracing
feature that will tell you what IRQ handler is using too much CPU
time.

Lee