Merge pull request #62133 from amolnar-rh/OCPBUGS-11739

OCPBUGS-11739: Changed number of isolated/reserved CPUs

Author: bscott-rh

modules/cnf-tuning-nodes-for-low-latency-via-performanceprofile.adoc

@@ -28,8 +28,8 @@ metadata:
  name: performance
 spec:
  cpu:
-  isolated: "5-15" <1>
-  reserved: "0-4" <2>
+  isolated: "4-15" <1>
+  reserved: "0-3" <2>
  hugepages:
   defaultHugepagesSize: "1G"
   pages:
@@ -43,7 +43,7 @@ spec:
  nodeSelector:
   node-role.kubernetes.io/worker-cnf: "" <5>
 ----
-<1> Use this field to isolate specific CPUs to use with application containers for workloads.
+<1> Use this field to isolate specific CPUs to use with application containers for workloads. Set an even number of isolated CPUs to enable the pods to run without errors when hyperthreading is enabled.
 <2> Use this field to reserve specific CPUs to use with infra containers for housekeeping.
 <3> Use this field to install the real-time kernel on the node. Valid values are `true` or `false`. Setting the `true` value installs the real-time kernel.
 <4> Use this field to configure the topology manager policy. Valid values are `none` (default), `best-effort`, `restricted`, and `single-numa-node`. For more information, see link:https://kubernetes.io/docs/tasks/administer-cluster/topology-manager/#topology-manager-policies[Topology Manager Policies].