Power Capping | NVIDIA BlueField BMC Software

Power capping is supported on NVIDIA® BlueField®-3 only.

It is possible to adjust the system for reduced power consumption using the BMC. It is important to note that changes to power capping configuration only takes effect after BlueField reboot.

Redfish Power Capping Requests

Getting General Power Capping Information

Control information:

curl -k -u root:'<password>' -X GET https://<bmc_ip>/redfish/v1/Chassis/Card1/Controls/PowerLimit_0

Output example:

{
  "@odata.id": "/redfish/v1/Chassis/Card1/Controls/PowerLimit_0",
  "@odata.type": "#Control.v1_3_0.Control",
  "AllowableMax": 300,
  "AllowableMin": 200,
  "ControlMode": "Manual",
  "ControlType": "Power",
  "Id": "PowerLimit_0",
  "Name": "System Power Control",
  "SetPoint": 10,
  "SetPointUnits": "%",
  "Status": {
    "Health": "OK",
    "HealthRollup": "OK",
    "State": "Enabled"
  }
}

Enabling/Disabling Adjustment of Power Capping

curl -k -u root:'<password>' -H "Content-Type: application/json" -X PATCH https://<bmc_ip>/redfish/v1/Chassis/Card1/Controls/PowerLimit_0 -d '{"ControlMode":<"Manual"/"Disabled">}'

The ability to adjust power capping is disabled by default.

Setting Power Allocation Percentage

curl -k -u root:'<password>' -H "Content-Type: application/json" -X PATCH https://<bmc_ip>/redfish/v1/Chassis/Card1/Controls/PowerLimit_0 -d '{"SetPoint": <val>}'

Where val is the percentage of maximum capacity in Watts (AllowableMax).

If user configuration is lower than the minimum capacity power or higher than the maximum capacity power, then BMC will return error.

IPMI Power Capping Commands

Getting Power Capping Status

ipmitool raw 0x32 0xc4

Enabling/Disabling Adjustment of Power Capping

ipmitool raw 0x32 0xc5 <val>

Where val:

0 – disable
1 – enable

Permissions

Changeable only from BMC prompt using admin account.

The ability to adjust power capping is disabled by default.

Getting Power Capping Percentage

ipmitool raw 0x32 0xc8

Setting Power Capping Percentage

ipmitool raw 0x32 0xc9 <val>

Where val is the value in percentage [0:100].

Permissions

Changeable only from BMC prompt using admin account.

For example, if the maximum power capacity is 120 Watts, then set the system to work at 60 Watts (50%) using the following command:

ipmitool raw 0x32 0xc9 50

Getting Maximum Power Capacity

ipmitool raw 0x32 0xc6

Power is given in watts.

Getting Minimum Power Capacity

ipmitool raw 0x32 0xca

Power is given in watts.

Last updated: May 27, 2026