how should new cpupower be used

ayvango · Tux's lil' helper Joined: 08 Feb 2012 Posts: 118

I've read from several topics that cpufrequtils should be discarded for sake of cpupower utility. I've installed it and got some troubles.

There is no config file in /etc that describe cpupowerd behaviour like it was done by cpufreqd. Moreover the cpupowerd run-script in /etc/init.d just sets cpu frequency governor on the service spawning and stopping. It invokes no persistent daemons to watch for acpi events and temperature sensors.

So, how can cpupowerd be used in place of cpufreqd?

Logicien · Posted: Wed Sep 11, 2013 5:17 am Post subject:

cpufrequtils and cpupower just set the cpu frequency scaling policy on the start and stop of the service. They do not do anything else. They do not have a background daemon. Their configuration file is in /etc/conf.d directory.

cpufreqd is a daemon who can change the cpu frequency scaling policy according to it's configuration file /etc/cpufreqd.conf. cpufrequtils, cpupower and cpufreqd have to be install separately, cpufrequtils and cpupower conflicting each other.
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ayvango · Tux's lil' helper Joined: 08 Feb 2012 Posts: 118

So, should I keep using cpufreqd with newest kernels?

Logicien · Posted: Wed Sep 11, 2013 7:34 am Post subject:

It's depend of what you want. I do not see a big difference between cpupower and cpufrequtils. If you want a fine tune of the CPU according to events you can use cpufreqd. I stop using it since a couple of years. I only switch between ondemand and performance frequency scaling policie from time to time.

For a laptop you can use laptop-mode-tools. Some CPU setup can be done via the ACPI subsystem too.
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FaeLLe · n00b Joined: 13 Aug 2007 Posts: 13 Location: London

cpufreqd is now masked and will be removed in a month.

Any recommendations on how cpupower can be used a deamon to dynamically scale CPU frequencies?

Anon-E-moose · Posted: Sun Apr 06, 2014 4:54 pm Post subject:

I've just started using the freq govs. I installed ondemand, and it seems to be working pretty well.

I have conky set up to monitor each cpu core freq and the Vcore for the cpu.

Ramps up and down smoothly, both for video and compiling, as the freq drops the Vcore power drops correspondingly with it.

Unless you have some special needs I would just use ondemand and see how it works.
As Logicien said compile the performance gov and if needed swap to it.
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FaeLLe · n00b Joined: 13 Aug 2007 Posts: 13 Location: London

So if I understand correctly the governor should be able to manage the CPU frequency scaling and there should be no need for any third party tools (unless any special needs exist). Is this correct?

khayyam · Posted: Sun Apr 06, 2014 9:37 pm Post subject:

v_2e · n00b Joined: 28 Dec 2008 Posts: 21

Is there a way to perform the CPU governor (or maximum frequency) change depending on the CPU temperature with some tools other than cpufreqd?

CaptainBlood · Advocate Joined: 24 Jan 2010 Posts: 3595

Hi dear all,

Same question here, as we have 27°C 6:30 AM ...
We're on a rolling out compiling distro, remember?
Not to mention a possibly warming up world?

Thks for your attention.

khayyam · Posted: Tue Apr 08, 2014 5:53 pm Post subject:

v_2e, CaptainBlood ...

It somewhat depends on the cpufreq driver used ... if intel_pstate is used then thermald may work. Also disabling 'turbo' via /sys/devices/system/cpu/intel_pstate/no_turbo will help keep the temp down.

Otherwise, might look under /sys/devices/system/cpu and see what features the driver provides ...

best ... khay

lexflex · Posted: Tue Apr 08, 2014 6:02 pm Post subject:

CaptainBlood · Advocate Joined: 24 Jan 2010 Posts: 3595

Hi dear all,

I've been on cpufreqd for ages now, coz it allows to cap freq according to temp.
And since I moved to where I'm now, I experience shutdown du to overheat detection :

Xen dom0 and un to for domUs are making a fool out of me when competing with my daily simulatenous eix-sync && emerge -uDN world syndroma on my laptop.

khayyam : I thought p-state was obsolete (depreciated). Pardon me if I"m wrong. Anyhow will investigate accordingly. Thks

By the way I run on a Intel Core 2 Duo SU9400 / 1.4 GHz (plz stop laughing). Distcc in configured but untested yet due to lack of HW.

Bye RvryBudy and thanks for your attention.

khayyam · Posted: Wed Apr 09, 2014 6:37 pm Post subject:

Princess Nell · l33t Joined: 15 Apr 2005 Posts: 916

The whole cpufreqd/cpufrequtils/cpupower situation is quite unsatisfactory for mate users. How can we solve this conundrum?

Logicien · Posted: Thu Apr 10, 2014 1:35 am Post subject:

Cpufrequtils and Cpupower cannot be installed at the same time. You have to choose between one of the two. Only gkrellm-cpufreq depend on Cpufrequtils. So if you do not use this Gkrellm plugin you can switch between Cpupower and Cpufrequtils by unmerge one and emerge the other.

For the moment, I do not see any other package than Cpufreqd who can set the cpu frequency and governor according on the temperature of the processor. It is very usefull with Amd processors to prevent preventive shutdown due to overheating. Maybe laptop-mode-tools can. I haven't use it since long.

Princess Nell · l33t Joined: 15 Apr 2005 Posts: 916

The point of my posting was to show that mate-applets has a dependency on cpufrequtils.

Maybe there should be a virtual for it.

energyman76b · Advocate Joined: 26 Mar 2003 Posts: 2048 Location: Germany

netixen · n00b Joined: 26 Sep 2013 Posts: 31

There is a big difference in how the on-demand governor works on different cpus.
For instance some mobile cpus can only step up/down in to 3 frequencies (e.g 1200Mhz 2000Mhz 2200Mhz) while desktop cpus in to more or even step up/down through small steps +/- 10Mhz.
So the on-demand governor can deal with the performance management well but if you have thermal issues you will need to manage it from user-space.

I have written a user-space governor that monitors the thermal zones and adjusts the frequency when trip points are triggered. But I've only tested it on my own machines so it's not ready for the wild.
However if your system is about to catch on fire feel free to give me a shout.

szatox · Advocate Joined: 27 Aug 2013 Posts: 3129

Some procesors are said to be working better with conservative governor rather than on-demand. I think conservative is better for AMD CPUs and perhaps mobile CPUs. Purpose is the same as on-demand.
Never bothered to verify though, so well, just sain'.

Anon-E-moose · Posted: Mon Apr 14, 2014 10:53 pm Post subject:

From linux/Documentation/cpu-freq/governors.txt

The CPUfreq governor "ondemand" sets the CPU depending on the
current usage. To do this the CPU must have the capability to
switch the frequency very quickly.
---
The CPUfreq governor "conservative", much like the "ondemand"
governor, sets the CPU depending on the current usage. It differs in
behaviour in that it gracefully increases and decreases the CPU speed
rather than jumping to max speed the moment there is any load on the
CPU. This behaviour more suitable in a battery powered environment.
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defer- · Posted: Mon Apr 14, 2014 11:02 pm Post subject:

I have heard that ondemand saves more power than conservative in real word situations. Ondemand finishes tasks more quickly and cpu can go to sleep state more quickly.
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Gusar · Posted: Mon Apr 14, 2014 11:18 pm Post subject: