From a4019a6900c4cc3db420891ea50c92aac0576083 Mon Sep 17 00:00:00 2001
From: Darien Raymond <admin@v2ray.com>
Date: Fri, 2 Dec 2016 21:40:58 +0100
Subject: [PATCH] fast return on zero ack list

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

diff --git a/transport/internet/kcp/sending.go b/transport/internet/kcp/sending.go
index 60d36c84..8bcee9af 100644
--- a/transport/internet/kcp/sending.go
+++ b/transport/internet/kcp/sending.go
@@ -255,6 +255,10 @@ func (v *SendingWorker) ProcessSegment(current uint32, seg *AckSegment, rto uint
 	}
 	v.ProcessReceivingNextWithoutLock(seg.ReceivingNext)
 
+	if seg.Count == 0 {
+		return
+	}
+
 	var maxack uint32
 	var maxackRemoved bool
 	for i := 0; i < int(seg.Count); i++ {