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man/network: clarify SR-IOV section description and usage

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Document effect of the SR-IOV section in .link vs .network files and
restructure the SR-IOV section introduction for clarity.
This commit is contained in:
Tim Small
2025-04-27 12:47:53 +01:00
committed by Yu Watanabe
parent 0dc09ccba7
commit 8e24558e61
1 changed files with 12 additions and 5 deletions
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17
man/systemd.link.xml
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@@ -1269,11 +1269,18 @@
<refsect1 id='sr-iov'>
<title>[SR-IOV] Section Options</title>
<para>The [SR-IOV] section accepts the following keys. Specify several [SR-IOV] sections to
configure several SR-IOVs. SR-IOV provides the ability to partition a single physical PCI resource
into virtual PCI functions which can then be injected into a VM. In the case of network VFs, SR-IOV
improves north-south network performance (that is, traffic with endpoints outside the host machine)
by allowing traffic to bypass the host machine’s network stack.</para>
<para>SR-IOV provides the ability to partition a single physical PCI resource into virtual PCI
functions which can then be e.g. injected into a VM. In the case of network VFs, SR-IOV reduces
latency and CPU utilisation for north-south network traffic (that is, traffic with endpoints
outside the host machine), by allowing traffic to bypass the host machine’s network stack.
</para>
<para>The presence of an [SR-IOV] section in a .link file will cause the creation and
configuration of the specified virtual function. Within a .network file, the specified virtual
function will be configured, but must already exist. Specify several [SR-IOV] sections to
configure several SR-IOVs.</para>
<para>The [SR-IOV] section accepts the following keys.</para>
<variablelist class='network-directives'>
<varlistentry>