[mvapich-discuss] Support of rdma_rename

[Subramoni, Hari]

Hi, Nicolas.

Many thanks for the heads up. The version OFED we have locally did not have this feature yet. Can you please let me know from which OFED this has been made default? This will allow us to verify a proper fix.

Thx,
Hari.

Sent from my phone

On Jan 21, 2020 10:25 AM, Nicolas Morey-Chaisemartin <NMoreyChaisemartin at suse.com> wrote:
Hi,

Starting from rdma-core v24.0 (and a recent enough kernel) RDMA interfaces do not use the usual <vendor>_<x> format anymore (ie mlx5_1) but a more persistent <type><pci_id> format.
However this messes up completely the way mvapich2 detects the interface model as shown below:

# rdma dev
0: ibp0s12: node_type ca fw 12.22.1002 node_guid 248a:0703:0055:4518 sys_image_guid 248a:0703:0055:4504

## Running a mvapich2 IMB test shows:
[localhost:mpi_rank_0][mv2_get_hca_type] **********************WARNING***********************
[localhost:mpi_rank_0][mv2_get_hca_type] Failed to automatically detect the HCA architecture.
[localhost:mpi_rank_0][mv2_get_hca_type] This may lead to subpar communication performance.
[localhost:mpi_rank_0][mv2_get_hca_type] ****************************************************
[localhost:mpi_rank_0][rdma_open_hca] Unknown HCA type: this build of MVAPICH2 does notfully support the HCA found on the system (try with other build options)

Are you already aware of that issue and maybe already working on it ?
If yes, do you have a patch available (or need help writing one) ?

Regards

Nicolas Morey-Chaisemartin
RDMA/MPI maintainer for SUSE



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