TuneD unnecessarily restarts twice when both current TuneD profile changes and when a new TuneD profile is selected.

    

All NTO versions are affected.

    

Depends on the order of k8s object updates (races), but nearly 100% reproducible.

    

    1. Install SNO 
    2. Label your SNO node with label "profile"
    3. Create the following CR:

apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
  name: openshift-profile
  namespace: openshift-cluster-node-tuning-operator
spec:
  profile:
  - data: |
      [main]
      summary=Custom OpenShift profile 1
      include=openshift-node
      [sysctl]
      kernel.pty.max=4096
    name: openshift-profile-1
  - data: |
      [main]
      summary=Custom OpenShift profile 2
      include=openshift-node
      [sysctl]
      kernel.pty.max=8192
    name: openshift-profile-2
  recommend:
  - match:
    - label: profile
    priority: 20
    profile: openshift-profile-1

    4. Apply the following CR:

apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
  name: openshift-profile
  namespace: openshift-cluster-node-tuning-operator
spec:
  profile:
  - data: |
      [main]
      summary=Custom OpenShift profile 1
      include=openshift-node
      [sysctl]
      kernel.pty.max=8192
    name: openshift-profile-1
  - data: |
      [main]
      summary=Custom OpenShift profile 2
      include=openshift-node
      [sysctl]
      kernel.pty.max=8192
    name: openshift-profile-2
  recommend:
  - match:
    - label: profile
    priority: 20
    profile: openshift-profile-2

    

You'll see two restarts/applications of the openshift-profile-1

$ cat tuned-operand.log |grep "profile-1' applied"
2024-04-19 06:10:54,685 INFO     tuned.daemon.daemon: static tuning from profile 'openshift-profile-1' applied
2024-04-19 06:13:23,627 INFO     tuned.daemon.daemon: static tuning from profile 'openshift-profile-1' applied


    

Only 1 application of openshift-profile-1:

$ cat tuned-operand.log |grep "profile-1' applied"
2024-04-19 07:20:31,600 INFO     tuned.daemon.daemon: static tuning from profile 'openshift-profile-1' applied