[TCP]: BIC not binary searching correctly

ChangeSet 1.1448.127.7, 2005/03/22 19:06:48-08:00, [email protected]

	[TCP]: BIC not binary searching correctly
	
	2.4 version of same fix as 2.6.11.
	
	The problem is that BIC is supposed to reset the cwnd to the last loss value
	rather than ssthresh when loss is detected.  The correct code (from the BIC
	TCP code for Web100) is in this patch.
	
	Signed-off-by: Stephen Hemminger <[email protected]>
	Signed-off-by: David S. Miller <[email protected]>



 tcp_input.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)


diff -Nru a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
--- a/net/ipv4/tcp_input.c	2005-03-25 17:03:27 -08:00
+++ b/net/ipv4/tcp_input.c	2005-03-25 17:03:27 -08:00
@@ -1642,7 +1642,10 @@
 static void tcp_undo_cwr(struct tcp_opt *tp, int undo)
 {
 	if (tp->prior_ssthresh) {
-		tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh<<1);
+		if (tcp_is_bic(tp))
+			tp->snd_cwnd = max(tp->snd_cwnd, tp->bictcp.last_max_cwnd);
+		else
+			tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh<<1);
 
 		if (undo && tp->prior_ssthresh > tp->snd_ssthresh) {
 			tp->snd_ssthresh = tp->prior_ssthresh;