Merge commit 'v3.1-rc2' into HEAD

1 files changed, 25 insertions, 17 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index ac3b4a726a1..db2a4067013 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -106,16 +106,6 @@ inet_peer_maxttl - INTEGER
 	when the number of entries in the pool is very small).
 	Measured in seconds.
 
-inet_peer_gc_mintime - INTEGER
-	Minimum interval between garbage collection passes.  This interval is
-	in effect under high memory pressure on the pool.
-	Measured in seconds.
-
-inet_peer_gc_maxtime - INTEGER
-	Minimum interval between garbage collection passes.  This interval is
-	in effect under low (or absent) memory pressure on the pool.
-	Measured in seconds.
-
 TCP variables:
 
 somaxconn - INTEGER
@@ -280,6 +270,17 @@ tcp_max_orphans - INTEGER
 	more aggressively. Let me to remind again: each orphan eats
 	up to ~64K of unswappable memory.
 
+tcp_max_ssthresh - INTEGER
+	Limited Slow-Start for TCP with large congestion windows (cwnd) defined in
+	RFC3742. Limited slow-start is a mechanism to limit growth of the cwnd
+	on the region where cwnd is larger than tcp_max_ssthresh. TCP increases cwnd
+	by at most tcp_max_ssthresh segments, and by at least tcp_max_ssthresh/2
+	segments per RTT when the cwnd is above tcp_max_ssthresh.
+	If TCP connection increased cwnd to thousands (or tens of thousands) segments,
+	and thousands of packets were being dropped during slow-start, you can set
+	tcp_max_ssthresh to improve performance for new TCP connection.
+	Default: 0 (off)
+
 tcp_max_syn_backlog - INTEGER
 	Maximal number of remembered connection requests, which are
 	still did not receive an acknowledgment from connecting client.
@@ -335,7 +336,7 @@ tcp_orphan_retries - INTEGER
 	when RTO retransmissions remain unacknowledged.
 	See tcp_retries2 for more details.
 
-	The default value is 7.
+	The default value is 8.
 	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.
@@ -383,7 +384,7 @@ tcp_rmem - vector of 3 INTEGERs: min, default, max
 	min: Minimal size of receive buffer used by TCP sockets.
 	It is guaranteed to each TCP socket, even under moderate memory
 	pressure.
-	Default: 8K
+	Default: 1 page
 
 	default: initial size of receive buffer used by TCP sockets.
 	This value overrides net.core.rmem_default used by other protocols.
@@ -472,7 +473,7 @@ tcp_window_scaling - BOOLEAN
 tcp_wmem - vector of 3 INTEGERs: min, default, max
 	min: Amount of memory reserved for send buffers for TCP sockets.
 	Each TCP socket has rights to use it due to fact of its birth.
-	Default: 4K
+	Default: 1 page
 
 	default: initial size of send buffer used by TCP sockets.  This
 	value overrides net.core.wmem_default used by other protocols.
@@ -542,13 +543,13 @@ udp_rmem_min - INTEGER
 	Minimal size of receive buffer used by UDP sockets in moderation.
 	Each UDP socket is able to use the size for receiving data, even if
 	total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
-	Default: 4096
+	Default: 1 page
 
 udp_wmem_min - INTEGER
 	Minimal size of send buffer used by UDP sockets in moderation.
 	Each UDP socket is able to use the size for sending data, even if
 	total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
-	Default: 4096
+	Default: 1 page
 
 CIPSOv4 Variables:
 
@@ -1454,10 +1455,17 @@ sctp_mem - vector of 3 INTEGERs: min, pressure, max
 	Default is calculated at boot time from amount of available memory.
 
 sctp_rmem - vector of 3 INTEGERs: min, default, max
-	See tcp_rmem for a description.
+	Only the first value ("min") is used, "default" and "max" are
+	ignored.
+
+	min: Minimal size of receive buffer used by SCTP socket.
+	It is guaranteed to each SCTP socket (but not association) even
+	under moderate memory pressure.
+
+	Default: 1 page
 
 sctp_wmem  - vector of 3 INTEGERs: min, default, max
-	See tcp_wmem for a description.
+	Currently this tunable has no effect.
 
 addr_scope_policy - INTEGER
 	Control IPv4 address scoping - draft-stewart-tsvwg-sctp-ipv4-00