mirror of
https://github.com/systemd/systemd.git
synced 2024-12-22 17:35:35 +03:00
80 lines
3.1 KiB
XML
80 lines
3.1 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="iocost.conf" xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
<refentryinfo>
|
|
<title>iocost.conf</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>iocost.conf</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>iocost.conf</refname>
|
|
<refpurpose>Configuration files for the iocost solution manager</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para>
|
|
<filename>/etc/systemd/iocost.conf</filename>
|
|
<filename>/etc/systemd/iocost.conf.d/*.conf</filename>
|
|
</para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>This file configures the behavior of <literal>iocost</literal>, a tool mostly used by
|
|
<citerefentry><refentrytitle>systemd-udevd</refentrytitle><manvolnum>8</manvolnum></citerefentry> rules
|
|
to automatically apply I/O cost solutions to <filename>/sys/fs/cgroup/io.cost.*</filename>.</para>
|
|
|
|
<para>The qos and model values are calculated based on benchmarks collected on the
|
|
<ulink url="https://github.com/iocost-benchmark/iocost-benchmarks">iocost-benchmark</ulink>
|
|
project and turned into a set of solutions that go from most to least isolated.
|
|
Isolation allows the system to remain responsive in face of high I/O load.
|
|
Which solutions are available for a device can be queried from the udev metadata attached to it. By
|
|
default the naive solution is used, which provides the most bandwidth.</para>
|
|
</refsect1>
|
|
|
|
<xi:include href="standard-conf.xml" xpointer="main-conf" />
|
|
|
|
<refsect1>
|
|
<title>Options</title>
|
|
|
|
<para>All options are configured in the [IOCost] section:</para>
|
|
|
|
<variablelist class='config-directives'>
|
|
|
|
<varlistentry>
|
|
<term><varname>TargetSolution=</varname></term>
|
|
|
|
<listitem><para>Chooses which I/O cost solution (identified by named string) should be used
|
|
for the devices in this system. The known solutions can be queried from the udev metadata
|
|
attached to the devices. If a device does not have the specified solution, the first one
|
|
listed in <varname>IOCOST_SOLUTIONS</varname> is used instead.</para>
|
|
|
|
<para>E.g. <literal>TargetSolution=isolated-bandwidth</literal>.</para>
|
|
|
|
<xi:include href="version-info.xml" xpointer="v254"/></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><ulink url="https://github.com/iocost-benchmark/iocost-benchmarks">The
|
|
iocost-benchmarks github project</ulink></member>
|
|
<member><ulink url="https://github.com/facebookexperimental/resctl-demo/tree/main/resctl-bench/doc">The resctl-bench
|
|
documentation details how the values are obtained</ulink></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
|
|
</refentry>
|