Module Parameters

To set nmlx5_core parameters:

Copy
Copied!
            

esxcli system module parameters set -m nmlx5_core -p <parameter>=<value>

To show the values of the parameters:

Copy
Copied!
            

esxcli system module parameters list -m <module name>

For the changes to take effect, reboot the host.

Name

Description

Values

DRSS

Number of hardware queues for Default Queue (DEFQ) RSS.

Note: This parameter replaces the previously used “drss” parameter which is now obsolete.

  • 2-16

  • 0 - disabled

When this value is != 0, DEFQ RSS is enabled with 1 RSS Uplink queue that manages the 'drss' hardware queues.

Notes:

  • The value must be a power of 2.

  • The value must not exceed num. of CPU cores.

  • Setting the DRSS value to 16, sets the Steering Mode to device RSS

ecn

Enables the ECN feature

  • 1 - enabled

  • 0 - disabled (Default)

enable_nmlx_debug

Enables debug prints for the core module.

  • 1 - enabled

  • 0 - disabled (Default)

geneve_offload_enable

Enables GENEVE HW Offload

  • 1 - enabled

  • 0 - disabled (Default)

max_vfs

max_vfs is an array of comma separated integer values, that represent the amount of VFs to open from each port.

For example: max_vfs = 1,1,2,2, will open a single VF per port on the first NIC and 2 VFs per port on second NIC. The order of the NICs is determined by pci SBDF number.

Note: VFs creation based on the system resources limitations.

  • 0 - disabled (Default)

N number of VF to allocate over each port

Note: The amount of values provided in the max_vfs array should not exceed the supported_num_ports module parameter value.

mst_recovery

Enables recovery mode (only NMST module is loaded).

  • 1 - enabled

  • 0 - disabled (Default)

pfcrx

Priority based Flow Control policy on RX.

  • 0-255

  • 0 - default

It is an 8 bits bit mask, where each bit indicates a priority [0-7].

Bit values:

  • 1 - respect incoming PFC pause frames for the specified priority.

  • 0 - ignore incoming pause frames on the specified priority.

Note: The pfcrx and pfctx values must be identical.

pfctx

Priority based Flow Control policy on TX.

  • 0-255

  • 0 - default

It is an 8 bits bit mask, where each bit indicates a priority [0-7].

Bit values:

  • 1 - generate pause frames according to the RX buffer threshold on the specified priority.

  • 0 - never generate pause frames on the specified priority.

Note: The pfcrx and pfctx values must be identical.

rss

Number of hardware queues for NetQ RSS.

Note: This parameter replaces the previously used “rss” parameter which is now obsolete.

  • 2-8

  • 0 - disabled

When this value is != 0, NetQ RSS is enabled with 1 RSS uplink queue that manages the 'rss' hardware queues.

Notes:

  • The value must be a power of 2

  • The maximum value must be lower than the number of CPU cores.

supported_num_ports

Sets the maximum supported ports.

1-8

Default 1

Note: Before installing new cards, you must modify the maximum number of the supported ports to include the additional new ports.

dropless_rq

Enable dropless RQ

When this feature is enabled, packets that are received while the software ring is full will not be immediately dropped.

The firmware will wait a certain period of time assuming the software will post new WQEs, otherwise the packets will be dropped.

  • 1 - enabled

  • 0 – disabled

Default: 0

© Copyright 2023, NVIDIA. Last updated on Aug 31, 2023.