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Dell Mellanox: nmlx5 Driver generates numerous L2TableIndex modified Events in ESXi.

Summary: Observing frequent nmlx5_en_L2TableIndexAdd/Remove events generated by the Mellanox nmlx5 driver in the ESXi VMkernel log.

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Symptoms

The following log pattern is recorded in the ESXi VMkernel.
Log snippet:
 

2023-11-02T08:55:31.458Z cpu143:2097772)<NMLX_INF> nmlx5_core: vmnic5: nmlx5_en_L2TableIndexRemove - (nmlx5_core_en_main.c:7744) Delete 0:xx:xx:xx:xx:xx from L2 table
2023-11-02T08:55:31.458Z cpu143:2097772)<NMLX_INF> nmlx5_core: vmnic5: nmlx5_en_L2TableIndexAdd - (nmlx5_core_en_main.c:7631) Add 0:xx:xx:xx:x:x to L2 table
2023-11-02T08:55:36.456Z cpu96:2097772)<NMLX_INF> nmlx5_core: vmnic1: nmlx5_en_L2TableIndexRemove - (nmlx5_core_en_main.c:7744) Delete 0:xx:xx:xx:xx:xx from L2 table
2023-11-02T08:55:36.458Z cpu96:2097772)<NMLX_INF> nmlx5_core: vmnic1: nmlx5_en_L2TableIndexAdd - (nmlx5_core_en_main.c:7631) Add 0:xx:xx:xx:xx:xx to L2 table

Cause

It is expected behavior. Each time the VMkernel's NetQ load-balancer attempts to ADD a MAC filter based on a vmnic queue, the event nmlx5_en_L2TableIndexAdd is logged in the ESXi log. Similarly, when a filter is removed from the queue, the event nmlx5_en_L2TableIndexRemove is logged in the ESXi log.
These events are also generated when the movement of these filters is contingent upon the number of MAC filters (including VMs and VMKs) present on the host and the load on a specific Rx queue, which is managed by the Load Balancer.

Resolution

These events update the user on traffic filtering changes to the L2 table. They have no functional impact as they are informational events.
 

Affected Products

Mellanox Family of Adapters
Article Properties
Article Number: 000225826
Article Type: Solution
Last Modified: 12 Aug 2024
Version:  2
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