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Do not mention proprietary info or link to internal work items in this PR.

Work item: "Internal", or link to GitHub issue (if applicable).
SWDEV-573199

What were the changes?
Remove iommu warning in KVM env

Why were the changes made?
Running RCCL in some virtualized environments will result in warning "NCCL WARN Missing "iommu=pt" from kernel command line which can lead to system instablity or hang!" which is false as it is unnecessary to set iommu in these type of environments.

How was the outcome achieved?
Remove iommu warning in KVM env

Additional Documentation:
What else should the reviewer know?

Approval Checklist

Do not approve until these items are satisfied.

  • Verify the CHANGELOG has been updated, if
    • there are any NCCL API version changes,
    • any changes impact library users, and/or
    • any changes impact any other ROCm library.

@wenkaidu wenkaidu requested a review from a team December 19, 2025 17:07
@PJAvinash PJAvinash added the ci:regression-detection Run through all collectives and data types to identify any performance issues label Dec 23, 2025
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regression-detection run on commit e4ad655

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4 participants