mint 21 or 20 suggestion ...

Because mint/ubuntu lover i search the best distro for new rt-kernel.
Someone can suggest me best last rt-kernel for ethrcat + mint xx??

I install over H210 and I5-7500 ....

best regards

I use Mint 21 with 6.0.2 Debian RT kernel.
I do not use ethercat.
The new kernels have issues with Realtek network cards, so check that before jumping to new kernels.

Tommy is right.
I don't think ethercat is affected by the realtek card causing excessive network latency like the mesa cards
Just follow my sticky to install ethercat for Debian Bookworm (I think). This should get the right ethercat distro for kernel 6.0
 

so your suggestion was for Mint20 + kernel 6.0 + ethercat? .... using kernel 5.x??

regards
bkt

Mint 20 does not work with LinuxCNC 2.9 due to Python related issues.
It does compile and run without issues though, just not using the ready made debs.