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  1. OpenShift Bugs
  2. OCPBUGS-30306

tuned: tuned breaks dynamic IRQ affinity

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    • Icon: Bug Bug
    • Resolution: Done-Errata
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    • 4.15
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      This is a clone of issue OCPBUGS-26400. The following is the description of the original issue:

      Description of problem:

      If GloballyDisableIrqLoadBalancing in disabled in the performance profile then irqs should be balanced across all cpus minus the cpus that are explicitly removed by crio via the pod annotation irq-load-balancing.crio.io: "disable"
      
      There's an issue when the scheduler plugin in tuned will attempt to affine all irqs to the non-isolated cores. Isolated here means non-reserved, not truly isolated cores. This is directly at odds with the user intent. So now we have tuned fighting with crio/irqbalance both trying to do different things. 
      
      Scenarios
      - If a pod get’s launched with the annotation after tuned has started, runtime or after a reboot - ok 
      - On a reboot if tuned recovers after the guaranteed pod has been launched - broken
      - If tuned restarts at runtime for any reason - broken

      Version-Release number of selected component (if applicable):

         4.14 and likely earlier

      How reproducible:

          See description

      Steps to Reproduce:

          1.See description 
          2.
          3.
          

      Actual results:

          

      Expected results:

          

      Additional info:

          

       

              yquinn@redhat.com Yanir Quinn
              openshift-crt-jira-prow OpenShift Prow Bot
              Mallapadi Niranjan Mallapadi Niranjan
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                Created:
                Updated:
                Resolved: