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  1. OpenShift Bugs
  2. OCPBUGS-58402

iommu.passthrough for Arm64 GH nodes

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    • 4.18
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      This is a clone of issue OCPBUGS-52853. The following is the description of the original issue:
      —
      Description of problem:
      Back in 4.16.30 on Arm64 GraceHopper nodes in order for NVIDIA GPU validator to properly work when a performance profile was set on the system the following patch needed to be set:

      apiVersion: tuned.openshift.io/v1
kind: Tuned
metadata:
  name: performance-patch
  namespace: openshift-cluster-node-tuning-operator
spec:
  profile:
  - data: |
      [main]
      summary=Configuration changes profile inherited from performance created tuned
      include=openshift-node-performance-openshift-node-performance-profile
      [bootloader]
      cmdline_iommu_arm=-iommu.passthrough=1
      [service]
      service.stalld=start,enable
    name: performance-patch
  recommend:
  - machineConfigLabels:
      machineconfiguration.openshift.io/role: master
    priority: 19
    profile: performance-patch

      This is highlighted in KCS: https://access.redhat.com/solutions/7107635

      However in 4.18 the above does not work when using SRIOV due to a recent commit in SRIOV: https://github.com/openshift/sriov-network-operator/blob/release-4.18/pkg/plugins/generic/generic_plugin.go#L441

      Instead the following patch was required:

      data: |
       [main]
       summary=Additional Cloud 5G RAN Application tuning
       include=performance-patch
       [bootloader]
       # see https://github.com/openshift/cluster-node-tuning-operator/blob/release-4.18/assets/performanceprofile/tuned/openshift-node-performance#L172
       cmdline_hugepages=default_hugepagesz=1G hugepagesz=1G hugepages=32
       # DOES NOT WORK: based on KCS https://access.redhat.com/solutions/7107635 for GPU operator
       # cmdline_iommu_arm=-iommu.passthrough=1
       cmdline_iommu=-iommu.passthrough=1
       cmdline_iommu=+ iommu.passthrough=0

      We need a consistent patch method to ensure the validator issue is not hit.

      Version-Release number of selected component (if applicable):4.18

      How reproducible:
      100%

      Steps to Reproduce:
      1. Install OCP
      2. Install SRIOV + Performance Profile
      3. Install NVIDIA GPU Operator and Cluster policy

      Actual results:
      Validator fails for GPU operator unless patch above is applied

      Expected results:
      GPU validator should just work

      Additional info:

              yquinn@redhat.com Yanir Quinn
              openshift-crt-jira-prow OpenShift Prow Bot
              None
              Andrea Panattoni, Brent Rowsell
              Mallapadi Niranjan Mallapadi Niranjan
              None
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                Created:
                Updated:
                Resolved: