On 2/11/22 18:19, andy pugh wrote:
On Sat, 12 Feb 2022 at 00:07, Andy Howell <[email protected]> wrote:
Its no pretty. Jitter is about 80000. I had a look through bios
settings, but nothing jumped out at me.
Any ideas to improve it?
Which realtime system did you use? (at a guess, preempt-rt?)
Are you planning to use the parallel port? If not, then 80k is usable.
It _might_ be SMI. Is the latency generally good, with a regular crazy
excursion?
Try "latency-plot" from the command line to check this. If you see a
periodic spike every 64 seconds, then SMI is likely, but that
generally is a lot worse than 80k.
I was using prempt-rt. Yes, I'm using a parallel port. I did try the
latency plot. I didn't see anything strictly periodic. I installed the
RTAI kernel, but I think I have to get the matching LinuxCNC build. I
will sort that out tomorrow. Thanks for your help.
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