Latency High with 2.9.3 on older PC

Currently running Ubuntu 10.04 and Axis 2.5.4 with the RTAI kernel on a P4 3GHz with 2 G RAM going out to a G540 controller with close to 1000 programs ran.
Latency: Servo 7k (ns) Base 22k (ns) running glxears and accessing directories, etc.
Tried the latest ISO for 2.9.3 RT-Preempt kernel live from an almost-full flash drive
Latency: Servo 77k to 90k(ns) Base 72k (ns) running glxears and accessing directories, etc

Computer is currently standalone, no web surfing or networking. Currently it is partitioned for Ubuntu and an old Windows install.

Wondering if there is hope with this PC or if I am better off getting something else. And if get something else, what? I am not so PC and Linux savvy.

Refurbished i5 desktops start around 130$ in my market Dec 2024  but would need a card for the parallel port.

I saw on another thread where a solution was to load a Wheezy ISO which gets one up to 2.7.X LinuxCNC IIRC (yes?)

Thanks, I appreciated the input.





 

If it works for you = do not change.
If you do want to change, there is an option to use the 2.9.3 and install the RTAI kernel. Might improve latency, but also might not work at all due to old hardware.

I’m also old school here too with a direct (LPT port conected) gecko G540 . Ali with its very cheap recycled parts, now have my setup which I have been using for the last 10 years. A h81m board with a G3258 CPUcan be overclocked for a even lower latency. The G3258 is 2 core only and fully unlocked. I have overclock set to 4.2 from the 3.2 default with no extra CPU settings.

vi.aliexpress.com/item/1005003864471753....ller%7Cquery_from%3A


A modern N100 board is the way to go but its 4 times the price.    forum.linuxcnc.org/18-computer/54979-new...asrock-n100dc#318470