[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>

1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index f12007b80a46..d46338af6002 100644
--- 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