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consumption. For example, theoretically, you can cut power consumption if you clock the processors from
2 GHz down to 1 GHz.
CPU frequency scaling for Integrity MC990 X systems
The procedures that explain how to configure CPU frequency scaling on MC990 X systems depend on
whether your system includes the
intel_pstate
directory. If your MC990 X system includes the
intel_pstate
directory, then CPU frequency scaling is enabled with the Intel P State driver. The path
to the
intel_pstate
directory on your system is:
/sys/device/system/cpu/intel_pstate
After checking your MC990 X system for the presence of this directory, the following settings are available
to you:
• The CPU frequency settings for MC990 X systems that include an
intel_pstate
directory are:
◦
performance
(default)
◦
powersave
• The CPU frequency settings for MC990 X systems that do not include an
intel_pstate
directory
are:
◦
conservative
◦
ondemand
(default)
◦
performance
. This setting directs the processors to run at or near their maximum speeds.
◦
powersave
. This setting slows down the processors and might be suitable for your site during
periods of low use.
◦
userspace
Configuring the
powersave
setting on systems with the
intel_pstate
directory
About this task
By default, the CPU frequency setting on MC990 X servers that include the
intel_pstate
directory is
performance. During non-peak production times, you might want to configure the
powersave
setting.
To configure the
powersave
setting:
Procedure
1.
Log in as root to the system you want to configure.
2.
Use the
cpupower
command in one of the following formats:
a.
To enable the
powersave
setting, enter the following command:
#
cpupower frequency-set -g powersave
b.
To re-enable the
performance
setting, which is the default, enter the following command:
#
cpupower frequency-set -g performance
3.
Enter the following command to retrieve the setting that is in effect:
#
cpupower frequency-info
Verify that the setting you specified appears in the command output in the
current policy
field.
4.
(Optional) Use a text editor to edit the
/etc/init.d/after.local
file and add the following line:
cpupower frequency-set -g powersave
The preceding line ensures that after each boot, the system sets the
powersave
setting.
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CPU frequency scaling for Integrity MC990 X systems