[LinuxUsers] Powertop

[Paul Saenz]

I guess you didn't see this email Brian, but Roger is using PowerTop already.

I don't know why he thanked me, cause I didn't really have anything to do with it.



> Date: Mon, 20 Jul 2009 07:12:44 -0700
> From: scubacuda at gmail.com
> To: linuxusers at socallinux.org
> Subject: [LinuxUsers] Powertop
> 
> Thanks to Paul and Chris for suggesting Powetop for my Ubuntu laptop. 
> Since installing that, things have gone very well.  I now get way more 
> battery life (like over three hours, though not as good as Windows 7 
> supposedly gets on the same laptop)
> 
> For those that don't know, after you install it and run it as root, it 
> checks your system to see what resources it might minimize.
> 
> http://en.wikipedia.org/wiki/PowerTOP
> 
>  From wikipedia,
> 
> "PowerTOP is a software utility designed to measure, explain and 
> minimise a computer's electrical power consumption. It was released by 
> Intel in 2007 under the GPLv2 license. It works for both Intel and AMD 
> processors.
> 
> PowerTOP analyzes the programs, device drivers, and kernel options 
> running on a computer based on the Linux and Solaris operating systems, 
> and estimates the power consumption resulting from their use. This 
> information may be used to pinpoint software that results in excessive 
> power use. Many open source and free software programs, such as Mozilla 
> Firefox [1][2], have been patched to reduce their power consumption 
> since the release of PowerTOP. This is particularly useful for laptop 
> computer users who wish to prolong battery life, and data center 
> operators, for whom electrical and cooling costs are a major expenditure.
> 
> The original focus was on CPU sleep states, and showing the programs or 
> drivers responsible for "wakeups" which prevent CPUs entering sleep 
> states. A database of known problems automatically provides more user 
> friendly "tips" for specific sources of wakeups. However, it also shows 
> information on CPU frequency scaling. Over time the database has been 
> expanded to include tips on a wide range of power consumption issues.
> 
> It is most effective on laptop computers. Laptops are specifically 
> designed to allow power use to be both monitored and controlled. In 
> particular, many laptop computers can measure the rate of battery use 
> (when not connected to mains power). PowerTOP uses this feature to 
> estimate power usage in Watts and battery life. This provides immediate 
> feedback on changes made e.g. disabling wireless networking when not used."
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