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  1. OpenShift Bugs
  2. OCPBUGS-24263

[release-4.13] High CPU usage in the ovs-vswitchd daemon

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    • Service Delivery Architecture Overview

      Description of problem:

      ovs-vswitchd process on worker nodes service HCP components have very high CPU usage.

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

      4.12.

      How reproducible:

      This has only been seen on HyperShift worker nodes.

Root cause is believed to be Egress policies which define exceptions via CIDR ranges or port ranges, ie:
spec:
  podSelector:
    matchLabels:
      role: db
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - ipBlock:
            cidr: 172.17.0.0/16
            except:
              - 172.17.1.0/24
OR 

spec:
  podSelector:
    matchLabels:
      role: db
  policyTypes:
    - Egress
  egress:
    - to:
        - ipBlock:
            cidr: 10.0.0.0/24
      ports:
        - protocol: TCP
          port: 32000
          endPort: 32768

      Steps to Reproduce:

      1.
2.
3.

      Actual results:

       

      Expected results:

       

      Additional info:

      This was seen during an incident mentioned in the releated OHSS ticket

            dcbw@redhat.com Dan Williams (Inactive)
            pebrown.openshift Pete Brown
            Anurag Saxena Anurag Saxena
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              Created:
              Updated:
              Resolved: