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Do you have a Ethernet connected motion device?

If so, the latency test is relatively useless for determining the actual
LinuxCNC latency.

A simple ping test is much more informative:

sudo chrt 99 ping -i .001 -q -c 60000 [Device_IP]

(will run 1 minute and print out timing statistics)

Where device _IP is the IP address of your Ethernet motion control interface.
 

I have a EL2502 here but have not tried to install it yet. 
I think if you use ethercat sdos and ethercat pdos you will have all the info you need to create a generic profile.
I have written a couple of drivers for unnamed Chinese IO modules this way

From the dmesg log and tainting the kernel, I think you have secure boot is enabled. Try disabling that in your BIOS.

Failing that I did cover very briefly how to enroll the dkms module into the kernel when  you open a spoiler in my how to.
Installing a kernel module (DKMS in this case) under secure boot is denied unless specifically set as being safe. eg it taints the kernel

THCAD/THCAD2 frequency divide by 1 will not work reliably
with default 7I96 encoder settings, so as rodw suggests:
use 1/32.



 

Do you get latency warnings when you run LinuxCNC?
Are you still using the same PC discussed here on several topics?
Why do you keep doing the same things and expect different results? Stressing the system beyond it's limits will always fail.
Change the graphic card, get a used one for AMD, or get a used PC.
You had good latency at one point in time, so what happened?
LinuxCNC, one youtube video, no whatever stress test you run, nothing, if that works OK, move on to making chips.

there are a number of industrial PC's on Alibaba/Aliexpress.
Echoing PCW's comments about Intel NIC. I would look for 2 NIC's but you might get more
Probably external Wifi SMA connectors. This lets you extend antennas outside of your enclosure
Also, look for a built in serial port or two for VFD etc. Some have native RS485 ports with screw terminals builtin.
They usually come with a Vesa mounting bracket to mount behind a monitor so it should be easy to mount on a DIN rail. Meanwell have a nice aluminium bracket.

Used "Enterprise" edition PC's worked for me always, The likes of older Dell, newish HP and Lenovo and Fujitsu.
And, yes i have several "industrial" PC's collecting dust in the shop, they are just plain PC in a strange box and with much higher price.

Anyone interested in a 16x40 CNC Lathe? It was a Knuth Servoturn 410 NC lathe. I hated the PLC/Control that was on it so a LinuxCNC retrofit was started. The retrofit is not finished (look at the operators panel) but it does run, and it made quite a few parts for us.
               

Please contact me soon if interested, it has to be moved very soon. I really do not want to send it to the scrap-yard.
It is currently located at:
Lansing Machine Services Inc. (Closing)
425 Network Station
Chesapeake Va. 23320