Systems that have dual-core Intel Itanium 2 processors can
support Hyper-Threading. Hyper-Threading provides the ability for
processors to create an additional logical CPU that might allow additional
efficiencies of processing. For example, a dual-core processor with
Hyper-Threading active provides four logical CPUs, two on each core. The
effect that Hyper-Threading has on performance depends heavily on
the applications running on your system. HP recommends that you
start with Hyper-Threading disabled and experiment later, if you
wish.
You can enable or disable Hyper-Threading for a system whose
processors support it. To display the Hyper-Threading state for
a system, use the EFI info cpu or cpuconfig command. (The display indicates that “CPU threads” are
turned on or off.) For example:
Shell> cpuconfig
PROCESSOR MODULE INFORMATION
# of L3 L4 Family/
CPU Logical Cache Cache Model Processor
Module CPUs Speed Size Size (hex.) Rev State
----- ------- ------ ------ ------ --------- --- -----
0 4 1.4 GHz 6 MB None 20/00 CO Active
CPU threads are turned on.
|
To enable or disable Hyper-Threading, use the EFI cpuconfig threads on or cpuconfig threads off command. For more information, enter help cpuconfig at the EFI Shell prompt or see the appropriate hardware
documentation. The recent release of the Partition Manager also
supports Hyper-Threading.
After enabling or disabling Hyper-Threading, the system must
be reset for the change to take effect. Use the EFI Shell reset command. When Hyper-Threading is enabled, it remains
active on the next reboot of the system.
