hardware smt

Enables or disables simultaneous multithreading (SMT).

Syntax

hardware smt { enable | disable }

Command Default

By default, SMT is enabled.

Parameters

enable: Enables SMT.
disable: Disables SMT.

Modes

Privileged EXEC mode

Usage Guidelines

SMT is a performance optimization mechanism deployed by Intel processors. To help mitigate security vulnerabilities related to SMT, use the hardware smt command to enable or disable SMT.

By enabling SMT, you disable the security mitigation in favor of better performance. By disabling SMT, you enable the security mitigation.

You need to restart the device to enable changes. A warning message in the CLI reminds you to do so.

This command is supported on the Broadcom Extreme 8820, SLX 9740, SLX 9640, and SLX 9540 devices only.

Examples

This example enables SMT.

device# hardware smt enable
Warning: Please reload the switch to activate the new SMT setting.

This example disables SMT.

device# hardware smt disable
Warning: Performance will be impacted with SMT disabled.
Warning: Please reload the switch to activate the new SMT setting.