CFS quotas can lead to unnecessary throttling in OpenShift Container Platform

Solution Verified - Updated -

Issue

  • On OpenShift with hard cpu limits we noticed java applications were not be allowed to use their entire quota. This particularly affected massively threaded applications. For example if you assign 1 cpu to an application, it only ever maxed out at using .1 cpu while also hitting throttling the entire time it was running. This results in having to massively over-provision applications thereby wasting resources on the nodes.
  • CFS quotas can lead to unnecessary throttling
  • Is Red Hat affected by https://github.com/kubernetes/kubernetes/issues/67577 ?

Environment

  • Red Hat OpenShift Container Platform (OCP) 3 and 4
  • Red Hat Enterprise Linux (RHEL) 7 and 8

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