Bad Max jitter / Latency

Hello,

I wanted to try LinuxCNC, so I bought myself a Chinese BOB and a nice small PC with paralllel port (Asrock Q1900B-ITX) but my latency is (very) bad.

when I run the test I see ‘last interval’ around 25000, but the max jitter is over 200.000.

Is my PC so bad or is this fixable somehow?

Try the Debian 7 Wheezy from
linuxcnc.org/downloads/

I think I fixed it now.. with the following edit (still on Debian 10):
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1,2,3"

Now the max jitter is below 15.000 ns