[TCP]: Add tcp_slow_start_after_idle sysctl.

A lot of people have asked for a way to disable tcp_cwnd_restart(),
and it seems reasonable to add a sysctl to do that.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index f12007b..d46338a 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -362,6 +362,13 @@ tcp_workaround_signed_windows - BOOLEAN
        not receive a window scaling option from them.
        Default: 0
 
+tcp_slow_start_after_idle - BOOLEAN
+       If set, provide RFC2861 behavior and time out the congestion
+       window after an idle period.  An idle period is defined at
+       the current RTO.  If unset, the congestion window will not
+       be timed out after an idle period.
+       Default: 1
+
 IP Variables:
 
 ip_local_port_range - 2 INTEGERS

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 98338ed..cee944d 100644 (file)
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -405,6 +405,7 @@ enum
        NET_TCP_BASE_MSS=114,
        NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS=115,
        NET_TCP_DMA_COPYBREAK=116,
+       NET_TCP_SLOW_START_AFTER_IDLE=117,
 };
 
 enum {

diff --cc include/net/tcp.h
Simple merge

diff --cc net/ipv4/sysctl_net_ipv4.c
Simple merge

diff --cc net/ipv4/tcp_output.c
Simple merge