diff options
| author | John Heffner <jheffner@psc.edu> | 2007-02-27 10:03:56 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-02-28 09:42:15 -0800 |
| commit | 71599cd1c381d1b5f58c35653ac1d3627c6276db (patch) | |
| tree | 32a36681a402a4144507d9bc4675facfa51974a4 /Documentation/networking/ip-sysctl.txt | |
| parent | b08d5840d2c5a6ac0bce172f4c861974d718e34b (diff) | |
[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 <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/ip-sysctl.txt')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index a0f6842368c..d3aae1f9b4c 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 |