LinuxCNC_Documentation.pdf

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15 Oct 2016 10:31 #81666 by Patrick Obrien
Patrick Obrien created the topic: LinuxCNC_Documentation.pdf
On page 280 5.3.1.1 Run a Latency Test the text:

"The last number in the column labeled "ovl max" is the most important."

refers to a paragraph which has been deleted. I found it in older versions, as follows:
sudo mkdir /dev/rtf; sudo mknod /dev/rtf/3 c 150 3;
sudo mknod /dev/rtf3 c 150 3; 
cd /usr/realtime*/testsuite/kern/latency; ./run
and then you should see something like this:

ubuntu:/usr/realtime-2.6.12-magma/testsuite/kern/latency$ ./run 
*
*
* Type ^C to stop this application.
*
*

## RTAI latency calibration tool ##
# period = 100000 (ns) 
# avrgtime = 1 (s)
# do not use the FPU
# start the timer
# timer_mode is oneshot

RTAI Testsuite - KERNEL latency (all data in nanoseconds)
RTH|    lat min|    ovl min|    lat avg|    lat max|    ovl max|   overruns
RTD|      -1571|      -1571|       1622|       8446|       8446|          0
RTD|      -1558|      -1571|       1607|       7704|       8446|          0
RTD|      -1568|      -1571|       1640|       7359|       8446|          0
RTD|      -1568|      -1571|       1653|       7594|       8446|          0
RTD|      -1568|      -1571|       1640|      10636|      10636|          0
RTD|      -1568|      -1571|       1640|      10636|      10636|          0
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