<varname>MemoryLimit=</varname> is a more powerful (and
working) replacement for <varname>LimitRSS=</varname>.</para>
+ <para>For system units these resource limits may be chosen freely. For user units however (i.e. units run by a
+ per-user instance of
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>), these limits are
+ bound by (possibly more restrictive) per-user limits enforced by the OS.</para>
+
+ <para>Resource limits not configured explicitly for a unit default to the value configured in the various
+ <varname>DefaultLimitCPU=</varname>, <varname>DefaultLimitFSIZE=</varname>, … options available in
+ <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, and –
+ if not configured there – the kernel or per-user defaults, as defined by the OS (the latter only for user
+ services, see above).</para>
+
<table>
- <title>Limit directives and their equivalent with ulimit</title>
+ <title>Resource limit directives, their equivalent <command>ulimit</command> shell commands and the unit used</title>
<tgroup cols='3'>
<colspec colname='directive' />
<thead>
<row>
<entry>Directive</entry>
- <entry>ulimit equivalent</entry>
+ <entry><command>ulimit</command> equivalent</entry>
<entry>Unit</entry>
</row>
</thead>