LATENCY(1)							      Xenomai								LATENCY(1)

NAME

       latency - Xenomai timer latency benchmark

SYNOPSIS

       latency [options]

DESCRIPTION

       latency	is part of the Xenomai test suite. It is a timer latency benchmark program.  The system must run a suitable Xenomai enabled kernel
       with the respective module (xeno_timerbench).

OPTIONS

       latency accepts the following options:

       -h     print histograms of min, avg, max latencies

       -s     print statistics of min, avg, max latencies

       -H <histogram-size>
	      default = 200, increase if your last bucket is full

       -B <bucket-size>
	      default = 1000ns, decrease for more resolution

       -p <period_us>
	      sampling period

       -l <data-lines per header>
	      default=21, 0 to supress headers

       -T <test_duration_seconds>
	      default=0, so ^C to end

       -q     supresses RTD, RTH lines if -T is used

       -D <testing_device_no>
	      number of testing device, default=0

       -t <test_mode>
	      0=user task (default), 1=kernel task, 2=timer IRQ

       -f     freeze trace for each new max latency

       -c <cpu>
	      pin measuring task down to given CPU

       -P <priority>
	      task priority (test mode 0 and 1 only)

AUTHOR

       latency was written by Philippe Gerum <rpm@xenomai.org>. This man page was written by Roland Stigge <stigge@antcom.de>.

2.6.0								    2008-04-19								LATENCY(1)