Red Hat Summit9.20.2. Configure CPU models
You can configure CPU models for your virtual machines at both the cluster level and individual VM level. Set a cluster-wide default CPU model to automatically apply to all new VMs, or configure a specific CPU model for individual VMs to override the cluster default.
9.20.2.1. Configure the default CPU model
Use the defaultCPUModel setting in the HyperConverged custom resource (CR) to define a cluster-wide default CPU model.
When you set a cluster-wide default CPU model:
- Every new virtual machine (VM) that does not have an explicit CPU model defined receives a node selector for the chosen CPU model.
-
Only nodes labeled with
cpu-model.node.kubevirt.io/<cpuModel>are eligible to run VMs using the default model. - Nodes that do not support the selected CPU model are not considered during VM scheduling.
The defaultCPUModel is case sensitive and must match a CPU model supported by nodes in your cluster.
A CPU model configured at the VM level always takes precedence over the cluster-wide default CPU model.
Prerequisites
-
Install the OpenShift CLI (
oc).
Procedure
Open the
HyperConvergedCR by running the following command:$ oc edit hyperconverged kubevirt-hyperconverged -n openshift-cnvAdd the
defaultCPUModelfield to the CR and set the value to the name of a CPU model that exists in the cluster:apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: defaultCPUModel: "EPYC-IBPB"where:
EPYC-IBPB- Specifies a CPU model that is supported by nodes in your cluster.
- Apply the YAML file to your cluster.
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