Enable cpupower.service

[r0n1N]

Hi all,

I'm running CentOS 7 on our Sandy- and Ivy-Bridge server systems. I'd like to use the cpupower service and disable Intel's pstate feature. Therefore, I did the following.

I added

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intel_pstate=disable

to the kernel boot parameters and enabled the cpupower service by:

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systemctl enable cpupower.service

This created a symbolic link in /etc/systemd/system/multi-user.target.wants/ to a file/usr/lib/systemd/system/cpupower.service containing:

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[Unit]
Description=Configure CPU power related settings
After=syslog.target

[Service]
Type=oneshot
RemainAfterExit=yes
EnvironmentFile=/etc/sysconfig/cpupower
ExecStart=/usr/bin/cpupower $CPUPOWER_START_OPTS
ExecStop=/usr/bin/cpupower $CPUPOWER_STOP_OPTS

[Install]
WantedBy=multi-user.target

However, the service won't start on boot and if I type systemctl status cpupower.service, I get:

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cpupower.service - Configure CPU power related settings
   Loaded: loaded (/usr/lib/systemd/system/cpupower.service; enabled)
   Active: inactive (dead)

Do you have an idea what is going wrong here? I'm running a minimal installation without graphical user interface. Do you need further information? If I start the service by hand (systemctl start cpupower.service), everything works fine.

[DwayneI]

EL7 enables tuned (https://access.redhat.com/documentation ... Tuned.html) by default and that service conflicts with cpupower. As far as I can tell cpupower gets completely ignored by systemd once tuned is enabled. So you can either disable tuned and use cuppower or forget about cpupower and stick with tuned.

[ILMostro]

That's weird, unclear, and inconsistent with the package description, as it states

Currently only ethernet
: network and ATA harddisk devices are implemented

Perhaps a bug with `systemd`? There's no indication that CPU is part of the "components" being tuned with `tuned`.