[TCP]: Add vegas sysctl docs.

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6fd189917396ea8f17595c3306091edafb231f8a..f09a04800fa3033a6e439f939ffb940ebe835757 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -307,6 +307,15 @@ tcp_westwood - BOOLEAN
        wired networks and throughput over wireless links.   
         Default: 0
 
+tcp_vegas_cong_avoid - BOOLEAN
+       Enable TCP Vegas congestion avoidance algorithm.
+       TCP Vegas is a sender-side only change to TCP that anticipates
+       the onset of congestion by estimating the bandwidth. TCP Vegas
+       adjusts the sending rate by modifying the congestion
+       window. TCP Vegas should provide less packet loss, but it is
+       not as aggressive as TCP Reno.
+       Default:0
+
 ip_local_port_range - 2 INTEGERS
        Defines the local port range that is used by TCP and UDP to
        choose the local port. The first number is the first, the