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Bug
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Resolution: Not a Bug
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Minor
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None
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4.8
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Low
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No
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OCPNODE Sprint 233 (Blue)
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1
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False
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Description of problem:
`autoSizingReserved: true` feature reserves too low CPU allocation even less than default
Version-Release number of selected component (if applicable):
OCP 4.8+
How reproducible:
Always
Steps to Reproduce:
1. enable `autoSizingReserved: true` feature in KubeletConfig 2. check CPU reservation on nodes /etc/node-sizing.env after KubeletConfig applied https://docs.openshift.com/container-platform/4.10/nodes/nodes/nodes-nodes-resources-configuring.html#nodes-nodes-resources-configuring-auto_nodes-nodes-resources-configuring
Actual results:
Example 4xCPU + 16GB node = SYSTEM_RESERVED_CPU=0.08
Expected results:
`autoSizingReserved` should not reserve lesser CPU than would be reserved by default without any KubeletConfig in place. Allocations calculated by `autoSizingReserved` feature should add to the base CPU reservation of 500m
Additional info:
In OpenShift Container Platform 4.10, half of a CPU core (500 millicore) is now reserved by the system by default compared to OpenShift Container Platform 3.11 and previous versions. The sizes are determined taking that into consideration. https://docs.openshift.com/container-platform/4.10/scalability_and_performance/recommended-host-practices.html#master-node-sizing_recommended-host-practices
