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I am glad as i ran out of options a long time ago as most of it did not make sense!
What Asus?
If it has two or more sticks of RAM, yank one out and test, then yank the other and insert the first one, test again.

Rod, this would have been much more useful in the "driver boards" or EtherCAT or both sections, not here as OP has actual networking disconnecting, same as physically removing the cable.
I really appreciate you trying to help, but i really do not like when you point members of this forum and whoever reads this in the wrong direction.
This is the second time i am mentioning on this topic that none of that tuning will help with a disconnected link.

Forgot to mention it installs the realtek dkms drivers so your NIC's should be fine as Linux will install the correct drivers but it may select the first NIC for Ethercat. The automated tuning on my tests is about 50 % better than any of my  manual tuning attempts.
typing sudo verify will generate a PDF report card.

Typing sudo MrRodW-tuner --help will list some available options including selecting a different NIC but a bit untested right now. Sorry, it does not know German but I did try to treach it Italian at one stage but I could not test it here in Australia.

nice work guys!

If its working, I think you should add a PR of the driver, not the proof of concept hall, inin anf\d GUI extensions

Here is a checklist of the key optimizations required for a `PREEMPT_RT` real-time kernel on Debian, specifically tailored for network performance on interface `eno1`.

### 1. BIOS/UEFI & Hardware Level

* Disable **Intel SpeedStep / AMD Cool'n'Quiet**
* Disable **Global C-States** (C1E, C3, C6, etc.)
* Disable **Intel Turbo Boost / AMD Core Performance Boost**
* Disable **Hyper-Threading (SMT)** *(highly recommended for strict determinism)*
* Disable **System Management Interrupts (SMIs)** / Advanced Power Management

### 2. Boot Command Line (`grub-customizer`)
lastcore = the last CPU you have. say its 3 on a 4 core CPU but yours may be different
* Add `isolcpus=3` to isolate specific CPU cores for RT tasks
* Add `nohz_full=3` to enable full dynticks on isolated cores
* Add `rcu_nocbs=3` to move RCU callbacks off isolated cores
* Add `processor.max_cstate=0` and `intel_idle.max_cstate=0`
* Add `pcie_aspm=off` (disables PCIe Active State Power Management)
* Add `skew_tick=1`

### 3. Network Interface (`eno1`) Optimizations

* Disable **Adaptive Interrupt Moderation** (`ethtool -C eno1 adaptive-rx off adaptive-tx off`)
* Set static interrupt coalescing to 0 (`ethtool -C eno1 rx-usecs 0 tx-usecs 0`)
* Disable offloads causing latency spikes:
* Generic Receive Offload (`ethtool -K eno1 gro off`)
* Large Receive Offload (`ethtool -K eno1 lro off`)
* TCP Segmentation Offload (`ethtool -K eno1 tso off`)
* Bind `eno1` queues to the single dedicated, isolated CPU core

### 4. Operating System & IRQ Tuning

* Increase the real-time priority of the `eno1` threaded IRQ handlers (using `chrt`)
* Set the `eno1` IRQ affinity mask to use isolated core
* Set the system power management policy to performance (`cpupower frequency-set -g performance`)
* Disable the `irqbalance` daemon (`systemctl disable irqbalance`)

 

Well guys, I switched to a humble dell optiplex 5050 and the everything works perfectly. 
nuclear option. It still bugs me I can’t figure out what’s wrong with the ASUS. But I’ll take the ‘win’ for now…

Do you have anther PC or another Mesa card to see which device is dropping the connection?

Guys, literally as I was typing that this only happens with MPG stimulus, the computer crashed as I was launching LinuxCNC in the background! I completely unplugged all encoders and launched LlnuxCNC again, and it crashed again. 
This is no longer an MPG issue! Its a random computer issue I cant figure out. 
The crappy part is every component on the computer is NEW, and tests fine. There has got to be some BIOS setting I am missing. 

At least I can stop chasing my tail on the MPG. Before anyone asks, the crash logs are blank, no reported errors.  

As a point of interest, there is still something screwy going on with the computer being able to find the 6i25...

Hi Mueke,

Der ethercat hal Driver wurde komplett überarbeitet.
Beachte diesen threat:
www.forum.linuxcnc.org/ethercat/58103-et...m-jitter-fix?start=0

Das GitHub repo ist hier:
github.com/linuxcnc-ethercat/linuxcnc-ethercat

Wenn du Hilfe benötigst, sag Bescheid 

Not sure but I don't get an error when using 'M99' in gmoccapy.

There is some ongoing development on the documentation so that maybe broke something.

M99 is not working in Gmoccapy. 


I tested it in master branch and in feature_g54_on_program_stop branch.
It doesnt work in both branch.
It works in Axis GUI. 

M99 link is not working too:
 

see updated link above, also note changed usage as I wanted to follow the 'disable_g92_persistence' setting.

for M99 see (I have never used it myself):
linuxcnc.org/docs/scratch/html/gcode/o-c...fanuc-style-programs

what is your machine spindle tool type? tooltall is for non repeatable holders or er collet type holders where the preet length in the holder is not static. probe basic's native setup is for repeatable holders such as bt30/40 cat40 etc

guys, the 7i77 is fed off an independent 5vdc power supply, switches are set appropriately.