3.1.2 Graphical Installation Program Enhancement

The Oracle Linux 7 Update 7 graphical installation program has been enhanced to detect whether Simultaneous Multithreading (SMT) is enabled on a system. If the feature is enabled, a message is displayed at the bottom of the Installation Summary screen. SMT enables the execution of multiple threads on a single physical CPU core, which can improve performance. Note that the use of SMT is only possible where the CPU is SMT-capable.

Kernel options for setting whether SMT should be used on a system are available. By default, the mitigations=auto kernel parameter is set. This parameter mitigates against CPU vulnerabilities, but also leaves SMT enabled, even if it is vulnerable. In the event that a vulnerability is detected, you can disable SMT by booting the system with the kernel option set to mitigations=auto,nosmt.