From 9d83fbcb7c038c770e7a8ab762b8dc1ccd802928 Mon Sep 17 00:00:00 2001
From: v2ray <admin@v2ray.com>
Date: Thu, 30 Jun 2016 11:19:35 +0200
Subject: [PATCH] fix cwnd

---
 transport/internet/kcp/kcp.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/transport/internet/kcp/kcp.go b/transport/internet/kcp/kcp.go
index ea3859a1a..abdee6362 100644
--- a/transport/internet/kcp/kcp.go
+++ b/transport/internet/kcp/kcp.go
@@ -423,8 +423,8 @@ func (kcp *KCP) flush() {
 
 	// calculate window size
 	cwnd := _imin_(kcp.snd_una+kcp.snd_wnd, kcp.rmt_wnd)
-	if kcp.congestionControl {
-		cwnd = _imin_(kcp.cwnd, cwnd)
+	if kcp.congestionControl && cwnd < kcp.snd_una+kcp.cwnd {
+		cwnd = kcp.snd_una + kcp.cwnd
 	}
 
 	for !kcp.snd_queue.IsEmpty() && _itimediff(kcp.snd_nxt, cwnd) < 0 {