OLD Lathe conversion to a CNC

I assumed something was wrong . This is the model: intel 82579lm

The error I get when trying to update : forum.linuxcnc.org/9-installing-linuxcnc...kworm-update-problem

key missing : A94819A7CB97A204

The last command doesn't work. It says the key is missing from the server.
when trying to update only the kernel, it does not find a new version
 

With the help of chatgpt I fixed the expired certificate. But when I update again there is no new version of the kernel. Is this the latest version for my PC. Yesterday it came out with a real-time error again. What should I do?  PS I had to change source.listdeb deb.debian.org/debian bookworm-backports main contrib non-free non-free-firmwaredeb-src deb.debian.org/debian bookworm-backports main contrib non-free non-free-firmwareI now have a new kernel

There seems to be no change in latency
 

Do you still get real time errors on the 6.12 kernel?

(the 6.1x kernels are know to have poor network latency)

Note that the normal latency test is not really helpful here
as it doesn't actually do anything (no memory allocation, no I/O etc etc)
so just tests dispatch latency
 

One time I only received a warning message.
I did the latency test using the script at @ tommylight
Most of the time the maximum delay is 190us
I think when it jumped up 700us I saved a file to a flash drive.

What should I do now?
 

You could try reducing the servo thread rate to 2 ms
(and all stepgen P terms to 500)

You could also see if pinning the Ethernet IRQ to the top processor helps:

 

first chmod +x pinirq.txt
then
sudo pinirq.txt [ethernet device name]

And see if that helps (it will only last until a reboot)


 

There is no change, but I think it is worse. Because immediately after starting Linux, there was a warning message.

I ordered an i5 - 2500к processor.
It will arrive tomorrow and I will test it.

With the new processor, latency seems better. But the test started without internet (I had a problem with the internet).

 

But it seems the main problem is the communication with the mesa card. Please see the attached picture.
I get this as soon as I start LinuxCNC. Why are ping times good, but in LinuxCNC it is so slow?

 

Those *.tmax times are in CPU clock cycles and probably OK
if the CPU is ~3 GHz

@tommylight
Of course, there is thermal paste, and it's high-end. I'll check how the fan is spinning, but the issue could be due to the small case and the compact CPU cooler.

@PCW
The maximum clock frequency is 3.3GHz. Maybe this is a stupid question, but could the issue be caused by delayed communication between the 7i98 and 7i73, possibly due to dropped packets smart serial?