[TCP]: Do receiver-side SWS avoidance for rcvbuf < MSS.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index dc151139b5afbe642a2b9245f3795dc5d688f0f1..688b95594f2e9de0f2724889855e470ce6aab376 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1607,6 +1607,9 @@ u32 __tcp_select_window(struct sock *sk)
                 */
                if (window <= free_space - mss || window > free_space)
                        window = (free_space/mss)*mss;
+               else if (mss == full_space &&
+                        free_space > window + full_space/2)
+                       window = free_space;
        }
 
        return window;