cpupower-set(1)
NAME
cpupower-set - Set processor power related kernel or hardware configurations
SYNOPSIS
cpupower set [ -b VAL ]
DESCRIPTION
cpupower set sets kernel configurations or directly accesses hardware registers affecting processor power saving policies. Some options are platform wide, some affect single cores. By default values are applied on all cores. How to modify single core configurations is described in the cpupower(1) manpage in the --cpu option section. Whether an option affects the whole system or can be applied to individual cores is described in the Options sections. Use cpupower info to read out current settings and whether they are supported on the system at all.
Options
--perf-bias, -b
Sets a register on supported Intel processore which allows software
to convey its policy for the relative importance of performance
versus energy savings to the processor.
The range of valid numbers is 0-15, where 0 is maximum performance
and 15 is maximum energy efficiency.
The processor uses this information in model-specific ways when it
must select trade-offs between performance and energy efficiency.
This policy hint does not supersede Processor Performance states
(P-states) or CPU Idle power states (C-states), but allows software
to have influence where it would otherwise be unable to express a
preference.
For example, this setting may tell the hardware how aggressively or
conservatively to control frequency in the "turbo range" above the
explicitly OS-controlled P-state frequency range. It may also tell
the hardware how aggressively it should enter the OS requested C-
states.
This option can be applied to individual cores only via the --cpu
option, cpupower(1).
Setting the performance bias value on one CPU can modify the
setting on related CPUs as well (for example all CPUs on one
socket), because of hardware restrictions. Use cpupower -c all
info -b to verify.
This options needs the msr kernel driver (CONFIG_X86_MSR) loaded.
SEE ALSO
cpupower-info(1), cpupower-monitor(1), powertop(1)
AUTHORS
--perf-bias parts written by Len Brown <[email protected]> Thomas Renninger <[email protected]> 22/02/2011 CPUPOWER-SET(1)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
