diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/systemd.socket.xml | 41 |
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 |