Dbs (Demand Base Switching) - Hitachi Compute Blade 2000 User Manual

DBS (Demand Base Switching)

DBS (Demand Base Switching) is a function that controls ACPI processor
performance states (P-states) based on CPU usage. CPU voltage and frequency
vary in line with the set P-states. DBS optimizes voltage and frequency according to
CPU usage, minimizing the CPU's power consumption.
By enabling the DBS functionality, the CPU's frequency, as verifiable in the OS, can
be seen as lower than the rated frequency, depending on the set DBS values and
CPU workload.
 Setting procedure
To use DBS, you must enter settings on the BMC's server blade Web console and in
the OS.
(1) Setting on the EFI setup screen
On the EFI Setup screen, enable the CPU's Enhanced Intel SpeedStep
Technology (EIST) functionality. For details, see "EFI Setup Screen". On the
Advanced menu, select "CPU Configuration". On the displayed sub-menu,
select "EIST" and set "Enabled".
(2) Settings in the OS (Windows Server 2003)
The following describes how to set up DBS in Windows Server 2003.
From the Control Panel, click "Power Options". On the "Power Schemes" page,
change the "Power schemes" settings. Those relating to DBS are as follows.
DBS is enabled by setting "Server Balanced Processor Power and Performance
power scheme" (item 2).
#
1 Always on
2 Server Balanced Processor
Power and Performance power
scheme
(3) Setting in the OS (Windows Server 2008)
The following describes how to set up DBS in Windows Server 2008.
From the Control Panel, click "Power Options". On the "Select a power plan"
page, change the power plan settings. DBS is enabled by setting "Balanced"
(item 1).
#
1 Balanced
2 Power saver
3 High performance
Setup Item
Sets the performance state to the highest level,
and disables DBS. This is the default setting.
Enables DBS, and changes the performance
state dynamically according to the CPU load.
Setup Item
Enables DBS, and changes the performance
state dynamically according to the CPU load.
This is the default setting.
Sets the performance state to the lowest level.
Sets the performance state to the highest level,
and disables DBS.
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Description
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