OLD Lathe conversion to a CNC

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?

 

First thing, get some thermal paste to put on that processor, and the one before it, both are getting very hot doing not much, some Intel processors will start throttling at 63C, some a bit later, but nearly 70 you are getting seems to high with such medium load.

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?