On Wed, 16 Sept 2026 at 21:20, Nicklas SB Karlsson <[email protected]> wrote:

> Running Linuxcnc and send receive Ethernet jitter is small for most packets 
> but sometimes there is delay of well
> above on millisecond, running for maybe a minute or so worst case is between 
> 6...7 milliseconds.

Maybe you need to disable IRQ coalescing? It's mentioned briefly in
the hm2_eth docs, but also might be relevant to EtherCAT.
https://linuxcnc.org/docs/stable/html/man/man9/hm2_eth.9.html

(It's at least a google-able phrase for further investigation)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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