Jitter around 50,000,000 ns

I installed debian 12 and then linuxcnc using the sudo apt install method on a computer that used to run linuxcnc on debian 10.

The jitter numbers are huge, around 50,000,000 ns.  On debian 10 they were more like 50,000 ns.

What happened?

Are you sure you are running a real time kernel?

What does:

uname -a

report?
 

Thanks for your reply.

uname -a reports

Linux garage 6.1.0-28-rt-1md64 #1 SNP PREEMPT_RT Debian 6.1.119-1 (2024-11-22) x86_64 GNU/Linux.

The garage computer has an intel atom processor.

That should be -amd64 not -1md64, my typing error.

martyop post=316224 userid=3221
Thanks for your reply.

uname -a reports
doodle jump
Linux garage 6.1.0-28-rt-1md64 #1 SNP PREEMPT_RT Debian 6.1.119-1 (2024-11-22) x86_64 GNU/Linux.

The garage computer has an intel atom processor.

It is possible that the issue is related to the real-time kernel configuration on Debian 12. Please check if the kernel is compatible with LinuxCNC and make sure the system configuration is optimized for real-time.

Are you using a parallel port or Mesa or Pico control boards?
In a terminal
latency-histogram --nobase --sbinsize 1000 --show