Enable cpupower.service

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r0n1N
Posts: 1
Joined: 2014/08/19 08:21:42

Enable cpupower.service

Post by r0n1N » 2014/08/19 08:30:45

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
Posts: 1
Joined: 2014/09/24 06:23:18

Re: Enable cpupower.service

Post by DwayneI » 2014/09/24 06:38:31

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
Posts: 3
Joined: 2015/04/25 05:47:31

Re: Enable cpupower.service

Post by ILMostro » 2015/04/25 05:53:05

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`.

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