Once bumped to 4.4, we can apply PerformanceProfile instead of MachineConfig to bring RT and kernel args to nodes. We need to do it in 2 steps:
1. Install the operator with https://github.com/redhat-nfvpe/flexran-manifests/blob/master/additional_components/performance/performance_operator.yaml . This will expose the PerformanceProfile CR. Needs to be done at 03 level, executed on apply_workloads
2. Create  performance profile CRD and apply that to worker nodes. It needs to be something like: https://github.com/redhat-nfvpe/flexran-manifests/blob/master/cluster_configuration/base/performance_profile/performance_profile.yaml

This will mean several reboots to nodes. Validate that it is applied properly, and that after reboots are done, worker nodes are coming with real time operating system (uname -a will tell), and that kernel arguments are the ones expected (cat /proc/cmdline)