Installation Guide, Windows Server 2008 SP2 v7.0

Hyperthreading enables each physical processor to present itself to the OS and applications as
two virtual processors. This means each processor can work on two or more sets of tasks
simultaneously. This feature makes use of resources that would otherwise sit idle, enabling your
HP Integrity server to perform more work in less time.
NOTE: When enabled, hyperthreading is activated for all CPUs in the system. You cannot
apply hyperthreading to a single CPU, cell, or nPartition.
To enable hyperthreading on partitionable and nonpartitionable HP Integrity servers using the
Extensible Firmware Interface (EFI), follow these steps:
1. Reboot the system to the EFI Shell.
2. Issue the cpuconfig threads command. The system indicates whether hyperthreading
is turned ON or OFF.
3. If hyperthreading is currently OFF, issue the cpuconfig threads on command to turn
it on.
4. Verify success by rebooting to the EFI Shell again and issuing another cpuconfig threads
command, which should indicate ON.
56 Installing the OS