Which LinuxCNC HW for 2026+?

My guess is that their suggestion is to improve latency  of everything except
Ethernet on their isolated core by keeping Ethernet IRQs off the critical CPU.


 

PCW wrote:

My guess is that their suggestion is to improve latency  of everything except
Ethernet on their isolated core by keeping Ethernet IRQs off the critical CPU.



 

Yes, some said that latency spikes from the NIC housekeeping etc could interfere with the RT task.

Kudos go out to all who made this possible:  
60000+ probes for now, during the last 24 hours, with an RPi5, 7c81 and the brand new 2.9.7.  
Zero issues, so far.    \o/

While probing, this thing now also runs a VNC server in the background,  
I am connected via VPN; it’s streaming music and also downloading a random  
10GB image file in a web browser.  

Pretty good latency too. Comparable to a decent RTAI setup, imho.  

Still some extra steps, as described here,  
  forum.linuxcnc.org/49-basic-configuratio...rol-is-choppy#332726  
and this "xset -r“ drives me crazy, bc I have to use the keyboard until I managed to get the handwheel working.

 

Thank you very much for your suggestions.
Seems like there is indeed a lot of fine tuning or trial and error necessary.

Even with limits set to 99999, this happens; and on one system, I also got the probe error, although my „probe flipflop“ was held in reset.

So far, my first working setup >2.8.4 is the RPi/7c81 combo,
but with that working, I hope to find some time to learn more about your proposals for the Ethernet solution.


Thx,
AS

Those figures look pretty good, where did you get your kernel from or did you build it yourself.