Transmit Balancing

Some Intel® Ethernet 800 Series devices allow you to enable a transmit balancing feature to improve transmit performance under certain conditions. When the feature is enabled, you should experience more consistent transmit performance across queues and/or PFs and VFs.

By default, transmit balancing is disabled in the NVM. To enable this feature, use one of the following to persistently change the setting for the device:

Use the Ethernet Port Configuration Tool (EPCT) to enable the tx_balancing option. Refer to Ethernet Port Configuration Tool (EPCT) for more information.
Enable the Transmit Balancing device setting in UEFI HII.
Enable transmit balancing via Linux devlink. Refer to the Linux readme inside the driver tarball for more information.

When the driver loads, it reads the transmit balancing setting from the NVM and configures the device accordingly.

Note:

The user selection for transmit balancing in EPCT, HII, or Linux devlink is persistent across reboots. You must reboot the system for the selected setting to take effect.
This setting is device wide.
The driver, NVM, and DDP package must all support this functionality to enable the feature.

Performance Profile

Tuning Performance with SR-IOV Performance Profile