Hyperthreading

Enabling hyperthreading for XenServer allows a single processor core to function as two logical processors, often resulting in improved performance. If your XenServer server hardware CPUs support hyperthreading you may be able to optimize FortiGate-VM performance by enabling hyperthreading (sometimes called logical processor) in the server's BIOS and in XenServer.

To check hyperthreading status on a XenServer host:

1. Open a local shell and log in as 'root'.
2. Run the following command to display the number of threads uses on the XenServer host

   xl info | grep threads_per_core

   A value greater than 1 indicates that hyperthreading is enabled on the host. A value of 1 indicates that hyperthreading is disabled on the Xen command line or not enabled on the hardware.

To enable hyperthreading on a XenServer host:

1. Open a local shell and log in as 'root'.
2. Enter the following command:

   /opt/xensource/libexec/xen-cmdline --set-xen smt=1

3. Restart the XenServer host.

To disable hyperthreading on a XenServer host:

1. Open a local shell and log in as 'root'.
2. Enter the following command:

   /opt/xensource/libexec/xen-cmdline --set-xen smt=0

3. Restart the XenServer host.