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Looks like HDDs do have interrupts since they are slow and do need the OS to wait for datatransfers.
I'll see if the latency-test will get better or worse when the SSD will arrive

This is what comes up from that link

Alright, understood.
Today I spent some time with my cnc. I setup a new machine in LinuxCNC, and now I have two setups.. one is "good", and the other one shows this issue. 
What I found out - when I startup the "bad" machine and open the "probing" tab, none of the work offsets at the top is selected.
When I start the "good" machine, G54 always is preselected.

No idea if this makes sense or helps, but it fits to the error message imho...

 

Please notice that in step 2 at the end the 4 is missing from amd64
It should be:

$ sudo apt install -t bookworm-backports linux-image-rt-amd64 linux-headers-rt-amd64

Added 2 more.
@tomapc
@toma.cnc1
@toma.3d
@tomaberisha5688
Reminds me, i have to fix the name on the last one as it was the first one i registered.

Looks like 7I77 U15 (74LCX04) receives, buffers, and inverts
the ENCMUX signal to generate the EVEN/ODD signals that
enable the 26LS32 even and odd line receivers, so is a prime
suspect with encoder mux issues:

 

 

SSDs are overrated.

What is that supposed to mean? Any SSD is MUCH faster than a spinning hard drive, so how is this "overrated"

They are mostly good for Windows because NTFS has fragmentation issues.

They are good for all operating systems, not just Windows.

They do reduce boot time, but that is not really useful.

It is useful for everything that needs to be transferred from SSD to system RAM and back, especially when starting any application or closing it, or...

RAM is faster than any SSD, even "slow" DDR 866MHz is faster.

Not a valid comparison so why????

Make sure your RAM is dual-channel.

Yes, this is valid, but requires 2 or 4 sticks of RAM, same size, otherwise it defaults back to single channel.

You can get double speed with no drawback.

Not true, you get more speed, but never double speed, timings, latency, clocks, and some probably 50 more settings and parameters that prevent memory form physically reaching "double speed".

Why not?

Now i must ask, Why?
Why do you keep replying like this?
Again, i admire your will and effort to help others, and some times you do help so thank you for that, but sometimes your replies are like this causing more confusion and noise that is not helpful.

tommylight wrote:

Subbed with @tomapc and was already subbed with @toma.cnc1 , i think, will also check @toma.3d.

Thanks Tommy! (9 to go), keep up the good work.