Results of latency test, list of computers tested for use with LinuxCNC

None of the MB i have with AMD cpu's can disable hyperthreading, but that does not matter as all but one preform perfectly good for use with LinuxCNC.
The weird thing, the one that did not work well had a Ryzen 5 3500 that has no hyperthreading, it had terrible latency!
Even my Lenovo ThinkBook 14 G3 with Ryzen 5 5500 works nicely with LinuxCNC. And Lenovo ThinkPad T470 with Intel 6300 processor works, but with hyperthreading disabled, of course.
For Intel, always, always disable hyperthreading.

Could it have been a 3500u with integrated graphics? Didn't test it myself but tweaking the settings with RyzenAdj might help.

github.com/FlyGoat/RyzenAdj

UI for RyzenAdj:
gitlab.com/ryzen-controller-team/ryzen-controller#debian-like

Nope, it was a 3500X, came out after 3600 and the rest, probably 3600 with faulty scheduling/threading so came as 6 core/6 thread.

I won't be surprised if it was a failed 3600. You would think it's the other way around but this proves it's hard to predict the latency numbers.

It is not failed as in it failed during use, it is sold as such.
AMD makes a single processor, the 8 core substrate, from that depending on the failure rate, we get the 4 major versions:
2600/3600/5600/7600 is 6 core with one or two failed cores
2700/3700/5800/7800 is 8 cores with all cores working
3900/5900/7900 is dual substrate, sold as 12 core, so any or all of the 4 remaining cores failed
3950/5950/7950 dual substrate with all 16 functional cores.
-
Intel is much, much worse for this, but back in the Pentium 2/3 days, of this was good as they sold underrated clock speeds, sold pentium 3 labeled as celeron and to enable it as a fully fledged pentium 3 all you had to do is brake a singe pin on the processor!

I have a problem tuning my HP T620 plus Thin Client after reading/googling old threads how to do it but different cpu, debian, etc.

Now I have around 60-80000ns, that's plenty, tuning the bios wont help at all.

or should I buy Atom motherboard mini itx (with parallel port) that has very low latency ?