I am trying to build linuxcnc on a Beagle Bone Black.
One of my challenges is the latency is far greater than what is suggested:
I run latency-test and get a
200microsecond maximum jitter for the 1ms thread, and
150microsecond max jitter on the 25microsecond thread.
The interval for the 25microsecond thread is 6.8microsecond. Two things confuse me. First, I am surprised to see such a low thread period. Secondly, what I see is much less than the programmed thread period.
Are there any experts on PREEMPT-RT that can provide some clarity on this. For instance, is there a way to improve on the jitter in PREEMPT-RT?
debian@BeagleBone:~/linuxcnc-dev/src$ cat /etc/os-release
PRETTY_NAME=“Debian GNU/Linux 11 (bullseye)”
SUPPORT_URL=“Debian -- User Support”
Thanks very much,