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  1. OpenShift Virtualization
  2. CNV-56802

CPU hotplug doesn't work when networkInterfaceMultiqueue is enabled

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    • Quality / Stability / Reliability
    • 0.42
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    • CNV v4.99.0.rhel9-2317
    • Customer Reported
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      Description of problem:

      Trying to hotplug CPUs to a VM with networkInterfaceMultiqueue fails with error:

"Changes to CPU sockets require a restart when NetworkInterfaceMultiQueue is enabled"

      Version-Release number of selected component (if applicable):

      CNV 4.16.6

      How reproducible:

      Always

      Steps to Reproduce:

      1. Create a VM from rhel9-server-large template
2. Add 2 CPUs with the VM running

      Actual results:

      Hotplug doesn't work. OpenShift Virtualization plugin, in Diagnostics tab shows:

"Changes to CPU sockets require a restart when NetworkInterfaceMultiQueue is enabled"

      Expected results:

      Hotplug should work.

      Additional info:

      networkInterfaceMultiqueue is enabled by default in all the templates that have more than 1 CPU configured. This is enabled to improve network performance.

Hotplug is typically used with VMs that require more performance, so most of the VMs will already have more than 1 CPU.

              omisan@redhat.com Orel Misan
              vagnerfarias Vagner Farias
              Yossi Segev Yossi Segev
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                Created:
                Updated: