Enabling the ESXi Side-Channel-Aware Scheduler using the vSphere Web Client or vSphere Client
1. Connect to the vCenter Server using either the vSphere Web or vSphere Client.
2. Select an ESXi host in the inventory.
3. Click the Manage (5.5/6.0) or Configure (6.5/6.7) tab.
4. Click the Settings sub-tab.
5. Under the System heading, click Advanced System Settings.
6. Click in the Filter box and search VMkernel.Boot.hyperthreadingMitigation
7. Select the setting by name and click the Edit pencil icon.
8. Change the configuration option to true (default: false).
9. Click OK.
10. Reboot the ESXi host for the configuration change to go into effect.
Web Reference : https://kb.vmware.com/s/article/55806?fbclid=IwAR2WCb5N--clOhDfca6-WnvQ0pXLllkhhcpJo4MlfudWJ9_IvrvfdSDpoHU