OCPDOCS 17899 Document Kernel PSI Enablement in OpenShift 4.21 #104869
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| The performance impact of enabling PSI is negligible with the benefit of gaining critical resource pressure visibility for better scheduling and eviction decisions. This was tested on worker nodes (m5.2xl) on the AWS platform. For latency sensitive environments, we suggest testing it before enabling it on production. Enable it on 1 worker first, monitor for the performance impact, and gradually roll out to more workers. |
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The performance impact to of enabling PSI is negligible with the benefit of gaining critical resource pressure visibility for better scheduling and eviction decisions. This was tested on worker nodes (m5.2xl) on the AWS platform. For latency sensitive environments, we suggest testing it before enabling it on production. Enable it on 1 worker first, monitor for the performance impact, and gradually roll out to more workers. Enabling PSI introduces new metrics per container that can increase the RSS memory usage of prometheus-k8s pods. On a cluster with a big number of containers, monitor the memory usage of prometheus-k8s pods and adjust the resource if needed.
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I added 2 more sentences to the NOTE.
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https://issues.redhat.com/browse/OSDOCS-17899
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