Enable TCP Segmentation Offload (TSO) on the transmission path to have the NIC divide larger data chunks into TCP segments. Disable TSO to have CPU perform TCP segmentation.
By default, a host uses hardware TSO if its physical adapters support it.
Procedure
- In the vSphere Client, navigate to the host.
- On the Configure tab, expand System.
- Click Advanced System Settings.
- Edit the value of the Net.UseHwTSO parameter for IPv4 and of Net.UseHwTSO6 for IPv6.
- To enable TSO, set Net.UseHwTSO and Net.UseHwTSO6 to 1.
- To disable TSO, set Net.UseHwTSO and Net.UseHwTSO6 to 0.
- Click OK to apply the changes.
- To reload the driver module of the physical adapter, run the esxcli system module set console command in the ESXi Shell on the host.
- To disable the driver, run the esxcli system module set command with the --enabled false option.
esxcli system module set --enabled false --module nic_driver_module
- To enable the driver, run the esxcli system module set command with the --enabled true option.
esxcli system module set --enabled true --module nic_driver_module
- To disable the driver, run the esxcli system module set command with the --enabled false option.