From: John Heffner Date: Tue, 27 Feb 2007 18:03:56 +0000 (-0800) Subject: [TCP]: Document several sysctls. X-Git-Tag: v2.6.21-rc3~149^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71599cd1c381d1b5f58c35653ac1d3627c6276db;p=linux-2.6 [TCP]: Document several sysctls. This adds documentation for tcp_moderate_rcvbuf, tcp_no_metrics_save, tcp_base_mss, and tcp_mtu_probing. Signed-off-by: John Heffner Signed-off-by: David S. Miller --- diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index a0f6842368..d3aae1f9b4 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -147,6 +147,11 @@ tcp_available_congestion_control - STRING More congestion control algorithms may be available as modules, but not loaded. +tcp_base_mss - INTEGER + The initial value of search_low to be used by Packetization Layer + Path MTU Discovery (MTU probing). If MTU probing is enabled, + this is the inital MSS used by the connection. + tcp_congestion_control - STRING Set the congestion control algorithm to be used for new connections. The algorithm "reno" is always available, but @@ -243,6 +248,27 @@ tcp_mem - vector of 3 INTEGERs: min, pressure, max Defaults are calculated at boot time from amount of available memory. +tcp_moderate_rcvbuf - BOOLEAN + If set, TCP performs receive buffer autotuning, attempting to + automatically size the buffer (no greater than tcp_rmem[2]) to + match the size required by the path for full throughput. Enabled by + default. + +tcp_mtu_probing - INTEGER + Controls TCP Packetization-Layer Path MTU Discovery. Takes three + values: + 0 - Disabled + 1 - Disabled by default, enabled when an ICMP black hole detected + 2 - Always enabled, use initial MSS of tcp_base_mss. + +tcp_no_metrics_save - BOOLEAN + By default, TCP saves various connection metrics in the route cache + when the connection closes, so that connections established in the + near future can use these to set initial conditions. Usually, this + increases overall performance, but may sometimes cause performance + degredation. If set, TCP will not cache metrics on closing + connections. + tcp_orphan_retries - INTEGER How may times to retry before killing TCP connection, closed by our side. Default value 7 corresponds to ~50sec-16min