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OpenSM: Add information about limitations #22

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@clameter

Please add some information on the limitations of OpenSM. From what I know these are

  1. No SR-IOV support
  2. Multicast sweeps may cause multicast micro-loops which can cause the SM to fail.
  3. No Multicast support for ConnectX5 and 6.

These are issues fixed in the Mellanox OFED OpenSM.

Activity

  1. dcontiveros commented on Sep 3, 2023

    @dcontiveros

    I was attempting to setup SRIOV with Connect-X 4 card and ran into an issue where the physical link is up, but the state reports as down. From what I have read online, virtualization needs to be enabled, but I cannot see where to do that in this version of OpenSM.

    I am attempting to avoid all Nvidia drivers. I see there is this documentation:

    https://github.com/linux-rdma/opensm/blob/master/doc/opensm-sriov.txt

    However, I cannot seem to find a working example of how to use these two configuration options to get SRIOV working.

    I have virtual functions in lspci, am able to unbind/bind to vfio. I am now just lacking the OpenSM functionality.

  2. vladko1974 commented on Sep 4, 2023

    @vladko1974
    Contributor
  3. dcontiveros commented on Sep 4, 2023

    @dcontiveros

    Thanks Vladimir. Would it be possible to add SRIOV support as a feature request ? Is it even possible?

  4. vladko1974 commented on Sep 4, 2023

    @vladko1974
    Contributor
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