CPU Scaling

I don't like hot CPU's so when I install Linux I usually setup and install cpupower on it.
It's dead easy. Check this:

pacman -S cpupower

cat /etc/systemd/system/cpuscaling.service

[Unit]
Description=change cpu governor

[Service]
User=root
Type=oneshot
ExecStart=/usr/bin/cpupower frequency-set -g ondemand

[Install]
WantedBy=multi-user.target

systemctl enable cpuscaling.service
systemctl start cpuscaling.service

And this is what you should see after starting the service/rebooting:
systemctl status cpuscaling.service

* cpuscaling.service - Change CPU Governor
Loaded: loaded (/etc/systemd/system/cpuscaling.service; enabled)
Active: inactive (dead) since Tue 2014-08-19 06:07:54 UTC; 40s ago
Process: 2250 ExecStart=/usr/bin/cpupower frequency-set -g ondemand (code=exited, status=0/SUCCESS)
Main PID: 2250 (code=exited, status=0/SUCCESS)

Aug 19 06:07:54 alarm cpupower[2250]: Setting cpu: 0
Aug 19 06:07:54 alarm systemd[1]: Started Change CPU Governor.

To check if the CPU Governor is really running and reducing speed when idle we can use cpupower too:

cpupower frequency-info

analyzing CPU 0:
driver: kirkwood-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 5.0 us.
hardware limits: 400 MHz - 1.20 GHz
available frequency steps: 1.20 GHz, 400 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 400 MHz and 1.20 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 1.20 GHz (asserted by call to hardware).
cpufreq stats: 1.20 GHz:0.06%, 400 MHz:99.94% (296)

Comments

Post a Comment

Popular posts from this blog

Headless home server - Setting up Dynamic DNS (FreeDNS) and IPv6 tunnel (HE.net)

Every time I install a PlugComputer I setup a Dynamic DNS service so that I can access it's shell and apps/services from the Internet easily. My preferred Dynamic DNS service is FreeDNS which is very easy to install and setup. Plus, it's working on FreeBSD servers :-P Setting up an account at FreeDNS is fairly simple and it is also simple to setup a subdomain in the form of an A NAME with them. A subdomain is basically something that looks like aname.domain.com . Whatever! So after setting up your A NAME, you need to configure the headless server so that it frequently checks your public IP address. If it has changed from the last time it checked, it then has to register the new public IP address with your A NAME. Most Dynamic DNS services make this easy for us in the form of a URL that we can visit. And since the headless server doesn't run a proper web browser we can use WGET. Frequent checks are configured in the form of a script that is run every, say, 5 minutes. ...
Read more

[Howto] USB sniffing

SniffUSB tool: http://www.pcausa.com/Utilities/UsbSnoop/ Important blog article by crope: http://blog.palosaari.fi/2013/07/generating-rtl2832u-driver-code.html IRC log with crope and mchehab about USB sniffing: [11:06am] crope_: mchehab: ping. I have one RTL2830 driver 3.12 regression. I suspect it is coming from I2C changes, but problem is here that I2C subsystem maintainer has not answered to mails.... [11:07am] crope_: it is that https://patchwork.kernel.org/patch/3079491/ [11:07am] crope_: maybe it could be still safe to marge that patch even I am not sure why it is needed [11:16am] dddtest_e9d3d joined the chat room. [11:24am] mchehab: crope_: hmm... khali is on this channel [11:27am] mchehab: if just re-adding "priv->tuner_i2c_adapter.dev.parent = &i2c->dev;" is enough to fix it, go for it [11:37am] crope_: mchehab: I2C maitainer *just* replied [11:37am] crope_: and he says there should be parent, but it is unclear why it has not been crashed earli...
Read more

Sync Windows 2008 R2 domain controller with NTP servers

Taken from http://defaultreasoning.com/2009/11/16/synchronize-time-with-external-ntp-server-on-windows-server-2008-r2/ Kept here just for archiving purposes. All credits to them. 1 - First, from your computer open a command prompt and run "C:\>netdom /query fsmo" to locate your PDC Server. 2 - Then log in to your PDC Server and open the command prompt. 3 - Stop the W32Time service: C:\>net stop w32time 4 - Configure the external time sources, type: C:\> w32tm /config /syncfromflags:manual /manualpeerlist:”0.pool.ntp.org, 1.pool.ntp.org, 2.pool.ntp.org” 4a - May need to poke with the " and the , on the previous command. 5 - Make your PDC a reliable time source for the clients. Type: C:\>w32tm /config /reliable:yes 6 - Start the w32time service: C:\>net start w32time 7 - The windows time service should begin synchronizing the time. You can check the external NTP servers in the time configuration by typing: C:\>w32tm /query /configuration 8 -...
Read more