TUNED_ADM
TUNED_ADM
NAMESYNOPSIS
DESCRIPTION
OPTIONS
PREDEFINED PROFILES
PREDEFINED COMPAT PROFILES
FILES
SEE ALSO
AUTHOR
NAME
tuned-adm − commandline tool for switching between different tuning profiles
SYNOPSIS
tuned-adm [ list , active , profile <profile> , off ]
DESCRIPTION
This command line utility allows user to switch between user definable tuning profiles. Several predefined profiles are already included. You can even create your own profile, either based on one of the existing ones by copying it or make a completely new one. The distribution provided profiles are stored in subdirectories below /usr/lib/tuned and the user defined profiles in subdirectories below /etc/tuned. If there are same profiles on both places, user defined profiles have precedence.
The power saving profiles contain settings that are typically not enabled by default as they will noticeably impact the latency/performance of your system as opposed to the power saving mechanisms that are enabled by default. On the other hand the performance profiles disable the additional power saving mechanisms of tuned as they would negatively impact throughput or latency.
OPTIONS
|
list |
List all available profiles. |
|||
|
active |
Show current active profile. |
profile <profile>
Switches to the given profilename. If none is given or no valid one is given the command gracefully exits without performing any operation.
recommend
Recommend profile suitable for your system. Currently only static detection is implemented - it decides according to data in /etc/system-release-cpe and virt-what output. The rules for autodetection are defined in recommend.conf in profile directory. They can be overriden by user by putting the recommend.conf into /etc/tuned. The default rules recommends profiles targeted to the best performance or balanced profile if unsure.
|
off |
Switch off tuned. |
PREDEFINED PROFILES
At the moment
we’re providing the following pre defined profiles:
balanced
It is the default profile. It provides balanced power saving and performance. At the moment it enables CPU and disk plugins of tuned and it makes sure the ondemand governor is active (if supported by the current cpufreq driver). It sets the CPU energy performance bias to normal. It also enables AC97 audio power saving or (it depends on your system) HDA-Intel power savings with 10 seconds timeout. In case your system contains supported Radeon graphics card (with enabled KMS) it configures it to automatic power saving.
powersave
Maximal power saving, at the moment it enables USB autosuspend (in case environment variable USB_AUTOSUSPEND is set to 1), enables ALPM power saving for SATA host adapters, enables WiFi power saving, enables multi core power savings scheduler for low wakeup systems and makes sure the ondemand governor is active (if supported by the current cpufreq driver). It sets the CPU energy performance bias to powersave. It also enables AC97 audio power saving or (it depends on your system) HDA-Intel power savings (with 10 seconds timeout). In case your system contains supported Radeon graphics card (with enabled KMS) it configures it to automatic power saving. On Asus Eee PCs dynamic Super Hybrid Engine is enabled.
throughput-performance
Profile for typical throughput performance tuning. Disables power saving mechanisms and enables sysctl settings that improve the throughput performance of your disk and network IO. CPU governor is set to performance and CPU energy performance bias is set to performance. Disk readahead values are increased.
latency-performance
Profile for low latency performance tuning. Disables power saving mechanisms. CPU governor is set to performance andlocked to the low C states (by PM QoS). CPU energy performance bias to performance.
desktop
Profile optimized for desktops based on balanced profile. It additionaly enables scheduler autogroups for better response of interactive applications.
virtual-guest
Profile optimized for virtual guests based on throughput-performance profile. It additionally decreases virtual memory swapiness and increases dirty_ratio settings.
virtual-host
Profile optimized for virtual hosts based on throughput-performance profile. It additionally enables more aggresive writeback of dirty pages.
|
sap |
Profile optimized for the best performance of SAP software. It is based on throughput-performance profile. It additionally tunes sysctl settings regarding shared memory, semaphores and maximum number of memory map areas a process may have. |
PREDEFINED COMPAT PROFILES
We are also
providing so called "compat" profiles that are
here mostly for backward compatibility with tuned 1.0. They
are oriented to more specific scenarios.
default
It is the lowest of the available profiles in regard to power saving and only enables CPU and disk plugins of tuned.
desktop-powersave
A power saving profile directed at desktop systems. Enables ALPM power saving for SATA host adapters as well as the CPU, ethernet and disk plugins of tuned.
server-powersave
A power saving profile directed at server systems. Enables ALPM power saving for SATA host adapters, and activates the CPU and disk plugins of tuned.
laptop-ac-powersave
Medium power saving profile directed at laptops running on AC. Enables ALPM power saving for SATA host adapters, WiFi power saving as well as CPU, ethernet and disk plugins of tuned.
laptop-battery-powersave
Strong power saving profile directed at laptops running on battery. Currently an alias to powersave profile.
spindown-disk
Strong power saving profile directed at machines with classic HDDs. It enables aggressive disk spin-down. Disk writeback values are increased and disk swappiness is lowered. Log syncing is disabled. All partitions are remounted with ’noatime’ option. All tuned plugins are disabled.
enterprise-storage
Server profile for high disk throughput performace tuning. Disables power saving mechanisms and enables deadline IO scheduler. Enables hugepages and disables disk barriers. Disk readahead values are increased. CPU governor is set to performance.
FILES
/etc/tuned/*
/usr/lib/tuned/*
SEE ALSO
tuned(8) tuned-conf(5)
AUTHOR
Jan
Kaluža <jkaluza@redhat.com>
Jan VÄelák <jvcelak@redhat.com>
Jaroslav Å karvada <jskarvad@redhat.com>
Marcela
MaÅ¡láÅová
<mmaslano@redhat.com>
Phil Knirsch <pknirsch@redhat.com>
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.
