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Figure 3-10 Windows Power Options
Windows Server 2008
Windows Server 2008 includes updated support for ACPI processor power
management (PPM) features, including support for processor performance
states and processor idle sleep states on multiprocessor systems. Windows
Server 2008 implements PPM features by processor drivers that contain
processor-specific routines to determine the presence of PPM capabilities. The
correct loaded driver can be found in the following folder:
%SYSTEMDRIVE%\Windows\Inf %SYSTEMDRIVE%\Windows\Inf
For Intel processors, the Intelppm.sys file is used. Because the Intel Xeon is not
listed in the support matrix, the Microsoft generic driver Processr.sys is used
instead, until the support is available.
The power policies can be adjusted in the Power Options window. Each
processor power policy includes an upper and lower limit, referred to as the
Maximum processor state
Minimum processor state
and the
. They determine the
range of currently available P-states that Windows may use. These values are
exposed in the Advanced settings panel of the Power Options window, shown in
Figure 3-11 on page 105.
104
Planning, Installing, and Managing the IBM System x3950 M2
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