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Marek Suchánek 2018-01-10 21:03:53 +01:00
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<img alt="Tuned header" src="header1.png" usemap="#download" /></p>
<h1>Introduction</h1>
<p>Tuned is a daemon that uses udev to monitor connected devices and tunes system settings
according to a selected profile. It has plugin architecture to support various types of
configuration like sysctl, sysfs, kernel boot command line parameters, etc. All configuration
is stored in one place - in the so called Tuned profile. So instead of having configuration on multiple
places and in custom scripts it can be cleanly handled by Tuned profiles. Tuned profiles can be
defined hiearchicaly which can reduce duplication and simplify maintenance, i.e. more specialized
profiles can inherit generic profiles and just change what's needed instead of duplicating the code.
For example you can built generic profile for HTTP server upon throughput-performance profile and later
create two more specialized profiles for Apache server and Nginx server both profiles based on the generic
HTTP server profile.</p>
<p>Tuned is a system tuning service for Linux. It:</p>
<p>When applying the profile full rollback is supported, i.e. the system can be easily returned to the
state before the profile was applied. This can be handy for testing, benchmarking, experimenting, etc.
For example you can setup cron to have different profile applied during business hours and different
during night. Tuned supports hot plugging of devices and it can be controlled from the command line or
through the D-Bus, so it can be easily integrated into existing administering solutions. For example
at the moment it can be used with Cockpit.</p>
<ul>
<li>
monitors connected devices using the <code>udev</code> device manager
</li>
<li>
tunes system settings according to a selected profile
</li>
<li>
supports various types of configuration like sysctl, sysfs, kernel boot
command line parameters, and so on, integrated in a plug-in architecture
</li>
<li>
supports hot plugging of devices and can be controlled from
the command line or through D-Bus, so it can be easily integrated
into existing administering solutions: for example, with Cockpit
</li>
<li>
can be run in no-daemon mode with limited functionality (e.g. no
support for D-Bus, <code>udev</code>, tuning of newly created
processes, and so on) for systems with reduced resources
</li>
<li>
stores all its configuration cleanly in one place, in the
Tuned profile, instead of having configuration on multiple places
and in custom scripts
</li>
</ul>
<p>Tuned is distributed with a number of predefined profiles for common use cases like high
throughput, low latency, or powersave. Profiles optimizing performance for various products
like SAP, dBase servers, etc. are also provided and it's possible to customize them. For systems with
reduced resources Tuned can be run in no-daemon mode with limited functionality (e.g. no support
for D-Bus, udev, tuning of newly created processes, etc.).</p>
<p>Tuned profiles:</p>
<ul>
<li>
<p>can be defined hiearchicaly, which reduces duplication
and simplifies maintenance:</p>
<p>More specialized profiles can inherit generic profiles and just
change what's needed instead of duplicating the code.
For example, you can built a generic profile for HTTP server upon
the throughput-performance profile and later create two more
specialized profiles for the Apache server and the Nginx server,
basing both profiles on the generic HTTP server profile.
</p>
</li>
<li>
<p>support full rollback:</p>
<p>The system can be easily returned to the
state before the profile was applied. This can be handy for testing,
benchmarking, experimenting, and so on.
For example, you can set up a <code>cron</code> rule
to apply a certain profile during business hours and
a different one at night. </p>
</li>
<li>
<p>include a number of predefined profiles for common use cases:</p>
<p>For example, presets for high throughput, low latency, or powersave
are distributed. Profiles optimizing performance for various products
like SAP, dBase servers, and so on are also provided, and it's possible
to fully customize them.</p>
</li>
</ul>
<h1>Documentation</h1>
<p>Some documentation is available in the
<a href="https://docs-old.fedoraproject.org/en-US/Fedora/20/html/Power_Management_Guide/tuned.html">Fedora Power Management Guide</a>,
but it's incomplete and may not be up-to-date. New documentation is worked on.</p>
but it's incomplete and may not be up-to-date. New documentation is being worked on.</p>
<h1>Download</h1>
<p>Releases are available for download from the
@ -53,14 +90,14 @@ but it's incomplete and may not be up-to-date. New documentation is worked on.</
<h1>Development</h1>
<p>All development happens on the <a href="https://github.com/redhat-performance/tuned">GitHub project page</a>.</p>
<p>If you want to contribute, the best way is to create pull request through the GitHub.
If you are not familiar with the GitHub, you can also send patches / ideas to:
<a href="mailto:power-management@lists.fedoraproject.org">power-management AT lists.fedoraproject.org</a> or to
<p>If you want to contribute, the best way is to create a pull request through GitHub.
If you are not familiar with GitHub, you can also send patches and ideas to the
<a href="mailto:power-management@lists.fedoraproject.org">power-management AT lists.fedoraproject.org</a> e-mail address or to
individual authors from the git log who worked on the last release.</p>
<h1>License</h1>
<p>GNU General Public License version 2 or later
(<a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0.html">https://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a>).</p>
<p>Tuned is distributed under the GNU General Public License version 2 or later:
<a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0.html">https://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a>.</p>
<p><img alt="Red Hat logo" src="RedHat_logo_110x70.png" /></p>
</body>