X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=Documentation%2Fnetworking%2Fip-sysctl.txt;h=747a5d15d529c8bff449d88802b79b70a213a775;hb=0f035b8e8491f4ff87f6eec3e3f754d36b39d7a2;hp=af6a63ab9026a3f834a92af6746212e6b7e971f6;hpb=5f757f91e70a97eda8f0cc13bddc853209b2d173;p=mv-sheeva.git

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index af6a63ab902..747a5d15d52 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -180,13 +180,20 @@ tcp_fin_timeout - INTEGER
 	to live longer.	Cf. tcp_max_orphans.
 
 tcp_frto - INTEGER
-	Enables F-RTO, an enhanced recovery algorithm for TCP retransmission
+	Enables Forward RTO-Recovery (F-RTO) defined in RFC4138.
+	F-RTO is an enhanced recovery algorithm for TCP retransmission
 	timeouts.  It is particularly beneficial in wireless environments
 	where packet loss is typically due to random radio interference
-	rather than intermediate router congestion. If set to 1, basic
-	version is enabled. 2 enables SACK enhanced F-RTO, which is
-	EXPERIMENTAL. The basic version can be used also when SACK is
-	enabled for a flow through tcp_sack sysctl.
+	rather than intermediate router congestion.  FRTO is sender-side
+	only modification.  Therefore it does not require any support from
+	the peer, but in a typical case, however, where wireless link is
+	the local access link and most of the data flows downlink, the
+	faraway servers should have FRTO enabled to take advantage of it.
+	If set to 1, basic version is enabled.  2 enables SACK enhanced
+	F-RTO if flow uses SACK.  The basic version can be used also when
+	SACK is in use though scenario(s) with it exists where FRTO
+	interacts badly with the packet counting of the SACK enabled TCP
+	flow.
 
 tcp_frto_response - INTEGER
 	When F-RTO has detected that a TCP retransmission timeout was
@@ -286,7 +293,7 @@ tcp_no_metrics_save - BOOLEAN
 	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
+	degradation.  If set, TCP will not cache metrics on closing
 	connections.
 
 tcp_orphan_retries - INTEGER
@@ -433,6 +440,12 @@ tcp_workaround_signed_windows - BOOLEAN
 	not receive a window scaling option from them.
 	Default: 0
 
+tcp_dma_copybreak - INTEGER
+	Lower limit, in bytes, of the size of socket reads that will be
+	offloaded to a DMA copy engine, if one is present in the system
+	and CONFIG_NET_DMA is enabled.
+	Default: 4096
+
 CIPSOv4 Variables:
 
 cipso_cache_enable - BOOLEAN
@@ -874,8 +887,7 @@ accept_redirects - BOOLEAN
 accept_source_route - INTEGER
 	Accept source routing (routing extension header).
 
-	> 0: Accept routing header.
-	= 0: Accept only routing header type 2.
+	>= 0: Accept only routing header type 2.
 	< 0: Do not accept routing header.
 
 	Default: 0