Realtime Kernel for Ubuntu 24.04 LTS
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To enable Realtime Kernel in Ubuntu 24.04 LTS should be registered to Ubuntu Pro first. After the registered, you can enable the realtime kernel and following the instruction on the screen.
sudo apt install ubuntu-pro-client
sudo pro attach <token>
sudo pro enable realtime-kernel
The most simply way is to set to kernel boot parameters.
sudo nano /etc/default/grub
Add the following to the GRUB_CMDLINE_LINUX_DEFAULT
amd_pstate=disable rcu_nocb_poll rcu_nocbs=1-15 nohz=on nohz_full=1-15 kthread_cpus=0 irqaffinity=0 isolcpus=managed_irq,domain,1-15
The final looking on my AMD Ryzen 7 4800U (8-core 16 threadings) is as the following and make sure pstate is disabled.
GRUB_CMDLINE_LINUX_DEFAULT="amd_pstate=disable rcu_nocb_poll rcu_nocbs=1-15 nohz=on nohz_full=1-15 kthread_cpus=0 irqaffinity=0 isolcpus=managed_irq,domain,1-15 libata.force=noncq iommu.strict=1 iommu.passthrough=1 quiet splash"
sudo update-grub
IMPORTANT
In the case of lock up when boot, you need to press either ESC or Shift key, depends on whether it is BIOS or EFI, when boot up to go to GRUB boot menu in order to boot from previous kernel.
Virtualbox does not work on realtime kernel on my desktop for example. It is because not all applications can work for realtime kernel. Meanwhile, the boot up time is slower than low-latency kernel. I think low-latency kernel is more suitable for desktop usage.
Reference
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