Performance impact after upgrading to OpenShift 4.11 or above

Solution Verified - Updated -

Issue

After updating OpenShift Container Platform (OCP) version to 4.11+, the OpenShift cluster and its workloads have seen a degradation in performance.

This has impacted all CPU-intensive workloads such as packet forwarding, user workloads, KubeAPIServer, ETCD and many other applications in the cluster.

Additionally, some workloads are failing their health-checks potentially due to CPU throttling with spec.requests and spec.limits that were previously sufficient.

The clusters are running on older CPU architectures that may be vulnerable to hardware vulnerabilities such as Retbleed, Spectre and Meltdown.

Environment

  • OpenShift Container Platform
    • 4.11
    • 4.12
    • 4.13+
  • Intel and AMD processors

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