RTO connection timeout: sysctl documentation update

This patch updates the sysctl documentation concerning the interpretation
of tcp_retries{1,2} and tcp_orphan_retries.

Signed-off-by: Damian Lukowski <damian@tvk.rwth-aachen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 11 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 8be76235fe67..4e9c6d7b4efc 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -311,9 +311,12 @@ tcp_no_metrics_save - BOOLEAN
         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
-        depending on RTO. If you machine is loaded WEB server,
+        This value influences the timeout of a locally closed TCP connection,
+        when RTO retransmissions remain unacknowledged.
+        See tcp_retries2 for more details.
+
+        The default value is 7.
+        If your machine is a loaded WEB server,
         you should think about lowering this value, such sockets
         may consume significant resources. Cf. tcp_max_orphans.
 
@@ -327,16 +330,28 @@ tcp_retrans_collapse - BOOLEAN
         certain TCP stacks.
 
 tcp_retries1 - INTEGER
-        How many times to retry before deciding that something is wrong
-        and it is necessary to report this suspicion to network layer.
-        Minimal RFC value is 3, it is default, which corresponds
-        to ~3sec-8min depending on RTO.
+        This value influences the time, after which TCP decides, that
+        something is wrong due to unacknowledged RTO retransmissions,
+        and reports this suspicion to the network layer.
+        See tcp_retries2 for more details.
+
+        RFC 1122 recommends at least 3 retransmissions, which is the
+        default.
 
 tcp_retries2 - INTEGER
-        How may times to retry before killing alive TCP connection.
-        RFC1122 says that the limit should be longer than 100 sec.
-        It is too small number. Default value 15 corresponds to ~13-30min
-        depending on RTO.
+        This value influences the timeout of an alive TCP connection,
+        when RTO retransmissions remain unacknowledged.
+        Given a value of N, a hypothetical TCP connection following
+        exponential backoff with an initial RTO of TCP_RTO_MIN would
+        retransmit N times before killing the connection at the (N+1)th RTO.
+
+        The default value of 15 yields a hypothetical timeout of 924.6
+        seconds and is a lower bound for the effective timeout.
+        TCP will effectively time out at the first RTO which exceeds the
+        hypothetical timeout.
+
+        RFC 1122 recommends at least 100 seconds for the timeout,
+        which corresponds to a value of at least 8.
 
 tcp_rfc1337 - BOOLEAN
         If set, the TCP stack behaves conforming to RFC1337. If unset,