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-rw-r--r--man/systemd.socket.xml41
1 files changed, 41 insertions, 0 deletions
diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml
index 5efb398b09..4483905832 100644
--- a/man/systemd.socket.xml
+++ b/man/systemd.socket.xml
@@ -546,6 +546,47 @@
</varlistentry>
<varlistentry>
+ <term><varname>DeferAccept=</varname></term>
+
+ <listitem><para>Takes time (in
+ seconds) as argument. If set, the
+ listening process will be awakened
+ only when data arrives on the socket,
+ and not immediately when connection is
+ established. When this option is set,
+ the
+ <constant>TCP_DEFER_ACCEPT</constant>
+ socket option will be used (see
+ <citerefentry><refentrytitle>tcp</refentrytitle><manvolnum>7</manvolnum></citerefentry>),
+ and the kernel will ignore initial ACK
+ packets without any data. The argument
+ specifies the approximate amount of
+ time the kernel should wait for
+ incoming data before falling back to
+ the normal behaviour of honouring
+ empty ACK packets. This option is
+ beneficial for protocols where the
+ client sends the data first (e.g.
+ HTTP, in contrast to SMTP), because
+ the server process will not be woken
+ up unnecessarily before it can take
+ any action.
+ </para>
+
+ <para>If the client also uses the
+ <constant>TCP_DEFER_ACCEPT</constant>
+ option, the latency of the initial
+ connection may be reduced, because the
+ kernel will send data in the final
+ packet establishing the connection
+ (the third packet in the "three-way
+ handshake").</para>
+
+ <para>Disabled by default.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><varname>ReceiveBuffer=</varname></term>
<term><varname>SendBuffer=</varname></term>
<listitem><para>Takes an integer