On Fri, 2006-03-03 at 00:13 +0100, Guennadi Liakhovetski wrote:
> On Thu, 2 Mar 2006, Lee Revell wrote:
> 
> > Try enabling latency tracing in the kernel config and see what you get
> > in /proc/latency_trace.
> 
> Ok, it failed - it stayed empty. I tried 
> 
> echo 2 > /proc/sys/kernel/trace_enabled
> gettimeofday(0,1)
> gettimeofday(0,0)
> 
> still it stayed empty. Will look at it tomorrow - some more googling will 
> be needed - never tried it before.

That's for user triggered latency tracing, you want the standard kernel
latency tracer:

echo 1 > /proc/sys/kernel/trace_enabled
echo 0 > /proc/sys/kernel/preempt_max_latency

Then try nice -n -20 arecord ..., once you get some underruns:

cat /proc/latency_trace

Lee



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