[split] Real Time Kernels discussion

[Snoopy8]

Thank you, @"Snoopy8". This looks like the pointer I need, although I suspect it'll be Christmas reading and possibly another opportunity for indigestion 

Building an RT kernel is not for the faint hearted and very time consuming.

I have built a new RT kernel for my NUC, using the latest stable 6.1 RT version.   It is compatible with Ubuntu 22.04 and sounds better than the standard Ubuntu RT kernel 5.15.0-1032-realtime.  Maybe it is because the 6.1 kernel sounds better, but more likely due to me taking away unnecessary hardware options.  There are a lot more config options in Ubuntu now than a few years ago and took an hour to compile.   If I was not in a hurry, I could have removed a lot more config options to reduce the compile time.

I have also tried doing for the Pi.  The good news is the steps in the link I mentioned works
https://forums.raspberrypi.com/viewtopic.php?t=344994
Just have to change to the correct versions, suggest using 6.1.67. 

The bad news is that it took 1.5 hours to compile on a CM4, and likely many, many hours for your Pi3.  It is possible to use an external box to cross compile, but I have not gone there yet.  And the instructions will generate a standalone kernel, which used to be the default way for the Pi.  However, in bookworm for the CM4, it is using initramfs which should allow multiple kernels, but not working for me.  I have posted this info in the 1.3 beta thread and hope AK can give me answer.

If all of this is too much, suggest continuing your Christmas celebrations. Not only will this cause indigestion, but also headaches, frustration, stress