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