diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index c7fc107..684131c 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -257,6 +257,18 @@ tcp_frto_response - INTEGER
 		  to the values prior timeout
 	Default: 0 (rate halving based)
 
+tcp_init_recv_window - INTEGER
+	Default initial advertised receive window.  Actual window size
+	is this value multiplied by the MSS of the connection.  Its
+	possible to control/override this value per route table entry
+	via the iproute2 option initrwnd.
+	Minimum value is 1, but 2 is the recommended minimum.
+	The effective max value, is limited by the sockets receive
+	buffer size (default tcp_rmem[1], and possibly scaled by
+	tcp_adv_win_scale), and can further be limited by window
+	clamp.
+	Default: 10
+
 tcp_keepalive_time - INTEGER
 	How often TCP sends out keepalive messages when keepalive is enabled.
 	Default: 2hours.
diff --git a/include/net/tcp.h b/include/net/tcp.h
index a8cb00c..3334852 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -292,6 +292,7 @@ extern int sysctl_tcp_thin_dupack;
 extern int sysctl_tcp_early_retrans;
 extern int sysctl_tcp_limit_output_bytes;
 extern int sysctl_tcp_challenge_ack_limit;
+extern u32 sysctl_tcp_init_recv_window;
 
 extern atomic_long_t tcp_memory_allocated;
 extern struct percpu_counter tcp_sockets_allocated;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 9205e49..9bb6608 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -27,6 +27,7 @@
 #include <net/tcp_memcontrol.h>
 
 static int zero;
+static int one = 1;
 static int two = 2;
 static int tcp_retr1_max = 255;
 static int ip_local_port_range_min[] = { 1, 1 };
@@ -794,6 +795,14 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= &zero
 	},
+	{
+		.procname	= "tcp_init_recv_window",
+		.data		= &sysctl_tcp_init_recv_window,
+		.maxlen		= sizeof(sysctl_tcp_init_recv_window),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &one
+	},
 	{ }
 };
 
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e2bec81..bbf7a33 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -356,14 +356,14 @@ static void tcp_grow_window(struct sock *sk, const struct sk_buff *skb)
 static void tcp_fixup_rcvbuf(struct sock *sk)
 {
 	u32 mss = tcp_sk(sk)->advmss;
-	u32 icwnd = TCP_DEFAULT_INIT_RCVWND;
+	u32 icwnd = sysctl_tcp_init_recv_window;
 	int rcvmem;
 
-	/* Limit to 10 segments if mss <= 1460,
+	/* Limit to default 10 segments if mss <= 1460,
 	 * or 14600/mss segments, with a minimum of two segments.
 	 */
 	if (mss > 1460)
-		icwnd = max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
+		icwnd = max_t(u32, (1460 * icwnd) / mss, 2);
 
 	rcvmem = SKB_TRUESIZE(mss + MAX_TCP_HEADER);
 	while (tcp_win_from_space(rcvmem) < mss)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index cfe6ffe..5f3b26d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -59,6 +59,8 @@ int sysctl_tcp_limit_output_bytes __read_mostly = 131072;
  */
 int sysctl_tcp_tso_win_divisor __read_mostly = 3;
 
+u32 sysctl_tcp_init_recv_window __read_mostly = TCP_DEFAULT_INIT_RCVWND;
+
 int sysctl_tcp_mtu_probing __read_mostly = 0;
 int sysctl_tcp_base_mss __read_mostly = TCP_BASE_MSS;
 
@@ -235,14 +237,14 @@ void tcp_select_initial_window(int __space, __u32 mss,
 	}
 
 	/* Set initial window to a value enough for senders starting with
-	 * initial congestion window of TCP_DEFAULT_INIT_RCVWND. Place
+	 * initial congestion window of sysctl_tcp_init_recv_window. Place
 	 * a limit on the initial window when mss is larger than 1460.
 	 */
 	if (mss > (1 << *rcv_wscale)) {
-		int init_cwnd = TCP_DEFAULT_INIT_RCVWND;
+		int init_cwnd = sysctl_tcp_init_recv_window;
 		if (mss > 1460)
 			init_cwnd =
-			max_t(u32, (1460 * TCP_DEFAULT_INIT_RCVWND) / mss, 2);
+			max_t(u32, (1460 * init_cwnd) / mss, 2);
 		/* when initializing use the value from init_rcv_wnd
 		 * rather than the default from above
 		 */