Another realtime delay question - Mesa card

the driver is igb from intel.
Have you disabled coalescing as described in man hm2_eth?

grub-customizer is part of the  Linuxcnc 2.9.1 and 2.9.2 ISO on the downloads page
you've been shown another method.
sudo apt install grub-customizer just makes it easier

To check:

ethtool -c [your ethernet device name]

you may need

/sbin/ethtool -c [your ethernet device name]

on debian

Mecanix wrote:

Your advanced knowledge obviously evolved from the hobby with hardware you have, you are fortunate, Tommy.

Yea, but not a hobby, had 3 PC shops, worked as IT admin/network admin for OSCE and UN and local government, first computer in 1982 or thereabouts, electronics all my life since 7, blew a part of the building at 9, poisoned myself with Chlorine at 10, etc, etc, the list is very, very long.
All this in a country where i could not find a decent science magazine, still can not find M3 screws! But it taught me to find solutions to everything.

Fascinating, Tommy. Yes I've noticed, and in fact gained an incredible amount of knowledge based on your contributions here, for one I'm grateful for that.

A bit surprised to hear about your terrorism/fast-demolition skillset (!!), less on the chemical abuse though; also got severely poisoned when much younger, LSD it was if my memory serves well lol Likewise, BCompSc and career in the public sector here too (interesting). Keep it up ~fanclub. 

@rodw: I did install grub-customizer now and did change to the second option you mentionned as I did find cstate in the bios, and then also changed the interfaces file again from eth1 to enp1s0.
Rebooted, no difference in latency, if anything maybe slightly worst.

and output from ethtool -c



@Mecanix: How shall I try and modify the interface parameters to match your example?


Also, sorry to insist with my naivety, but what are the actual practical consequences of this bad timing on the machining process? What are the risks of keeping it at 80000 latency? I honestly have been getting this error for a while before getting myself to post here. And I haven't noticed any problem with the machine, keeping tolerances in the thousands of mm and speed of 3000 mm/m.

On second thoughts I always bad latency tests with this HW, but I don't think I was getting this error as much before upgrading to bookworm and 2.9. I definitely had to change the servo thread timing only after upgrade. Does that help diagnose?