TUNED_ADM(8) tuned TUNED_ADM(8)NAMEtuned-adm - commandline tool for switching between different tuning
profiles
SYNOPSIStuned-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 pro‐
vided 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 prece‐
dence.
The power saving profiles contain settings that are typically not
enabled by default as they will noticeably impact the latency/perfor‐
mance 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 nega‐
tively 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 direc‐
tory. They can be overriden by user by putting the recom‐
mend.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 sup‐
ported 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 sav‐
ings (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 gov‐
ernor 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 sav‐
ing mechanisms. CPU governor is set to performance andlocked to
the low C states (by PM QoS). CPU energy performance bias to
performance.
network-throughput
Profile for throughput network tuning. It is based on the
throughput-performance profile. It additionaly increases kernel
network buffers.
network-latency
Profile for low latency network tuning. It is based on the
latency-performance profile. It additionaly disables transparent
hugepages, NUMA balancing and tunes several other network
related sysctl parameters.
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-perfor‐
mance profile. It additionally decreases virtual memory swapi‐
ness and increases dirty_ratio settings.
virtual-host
Profile optimized for virtual hosts based on throughput-perfor‐
mance 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 bat‐
tery. 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 val‐
ues 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. Dis‐
ables 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 ALSOtuned(8)tuned-conf(5)AUTHOR
Jan Kaluža <jkaluza@redhat.com>
Jan Včelák <jvcelak@redhat.com>
Jaroslav Škarvada <jskarvad@redhat.com>
Marcela Mašláňová <mmaslano@redhat.com>
Phil Knirsch <pknirsch@redhat.com>
Fedora Power Management SIG 28 Mar 2012 TUNED_ADM(8)
