The system option kernel cpu nohz-full is not supported by the current Kernel options
set system option kernel cpu isolate-cpus '2-3' set system option kernel cpu nohz-full '2-3' set system option kernel cpu rcu-no-cbs '2-3'
Logs after reboot:
Sep 26 14:47:11 r14 kernel: Kernel command line: BOOT_IMAGE=/boot/2025.09.26-1054-integration/vmlinuz boot=live rootdelay=5 noautologin net.ifnames=0 biosdevname=0 vyos-union=/boot/2025.09.26-1054-integration hpet=disable mce=off nosoftlockup isolcpus=2-3 nohz_full=2-3 rcu_nocbs=2-3 nmi_watchdog=0 numa_balancing=disable default_hugepagesz=2M hugepagesz=2M hugepages=4096 console=tty0 Sep 26 14:47:11 r14 kernel: Housekeeping: nohz unsupported. Build with CONFIG_NO_HZ_FULL Sep 26 14:47:11 r14 kernel: Unknown kernel command line parameters "noautologin BOOT_IMAGE=/boot/2025.09.26-1054-integration/vmlinuz boot=live biosdevname=0 vyos-union=/boot/2025.09.26-1054-integration nohz_full=2-3 rcu_nocbs=2-3", will be passed to user space. Sep 26 14:47:11 r14 kernel: random: crng init done
Check kernel:
vyos@r14:~$ zcat /proc/config.gz | grep CONFIG_NO_HZ_FULL # CONFIG_NO_HZ_FULL is not set vyos@r14:~$ vyos@r14:~$ zcat /proc/config.gz | grep CONFIG_RCU_NOCB_CPU vyos@r14:~$