What is NVLink Subnet Manager?

What is NVLink Subnet Manager?

NVLink Subnet manager (NVLSM) originated from the IB networking and contains additional logic to program NVSwitches and NVLinks. At a high level, the NVLSM provides the following functionality to NVSwitch-based systems:

• Discovers the NVLink network topology.

• Assigns a local identifier (LID) to all the GPU and NVSwitch NVLink ports.

• Calculates and programs switch forwarding tables.

• Programs the Partition Key (PKEY) for NVLink partitions.

• Monitors changes in the NVLink fabric.