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Hi, I tried a lot the last days.
I set the P to 500 as you said, I made the realtec optional kernel settings, i took a look for Energy efficiency and did not find anything of this, I set ff2 back to 0, and in the first try (an air run of my last part) it seemed to run - but 2 min after start the motor-0-position error came again, right in a direction change of the path. As before.

That was very disappointing, so I decided to get another PC from the shelf, a Lenovo m910q with 16GB, i7-6700T 4C/8T and put the SSD from the other in it.
The machine started at once, no problems to fix, I declined all BIOS settings that are described in the latency thread. This jounger PC has WLAN for the Internet and a I219-LM Intel network card, that should be better, somebody told me.

I did the coalescence workaround in etc/interfaces, I made the ethtool working (sudo ethtool -C enp0s31f6 rx-usecs 0), I made the kernel options:   quiet irqaffinity=0,1 isolcpus=3 intel_idle.max_cstate=1 i915.enable_rc6=0

The outcome was not bad, but worse than before, regarding the ping times. The realtec gave me 0,056-0,070, the intel gives out:
rtt min/avg/max/mdev = 0.165/0.189/0.307/0.052 ms which is bad in my eyes.
Even if i kill the WLAN adapter, it does not much better:
111 packets transmitted, 111 received, 0% packet loss, time 112114ms
rtt min/avg/max/mdev = 0.108/0.164/0.199/0.011 ms

What do you think about it? should I go down to the machine and try it out or should I do sthing else?

Thanks for your advice, I appreciate that much!
Hanno

 

it worked on my Delta B3 Ethercat servos using CIA402/CSP config (see attachment).
i used linuxcnc-scurve-compat  from codeberg.

I still don't have the steppers or the drivers, I hope they will arrive soon, for now I have tested with only this stepper and driver connected:

 

thinking this was the problem I disconnected the stepper and left the card alone but the error is the same as soon as I start a video on YouTube or if I start chrt 99 ping -i .001 10.10.10.10 -c 40000000

the file conf:
 
 
 

driver:TB6560 JP-1635A
stepper: 57HD0401 15SB
controller: NVEM V5

Stepper and driver is only for test not final hardware.