From 0e41ddf870ab240f3e82bdd3e3c0c13bc91be339 Mon Sep 17 00:00:00 2001 From: winlin <winlin@vip.126.com> Date: Tue, 21 Feb 2017 15:09:25 +0800 Subject: [PATCH] Updated EN_KCP Feature (markdown) --- EN_KCP-Feature.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/EN_KCP-Feature.md b/EN_KCP-Feature.md index 1a3e4c8..2074531 100644 --- a/EN_KCP-Feature.md +++ b/EN_KCP-Feature.md @@ -20,7 +20,7 @@ TCP will try to reply ACK as late as possible(even TCP_NODELAY), which will caus #### UNA vs ACK+UNAļ¼ -There are two kinds of ARQ(Automatic Repeat reQuest) model responses: UNA (All segments before this number received, such as TCP) and ACK (The segment with this number received). All segments will be retransmit for UNA, for example, sender send 1,2,3,4,5 while receiver got 1,2,4,5, receiver will reply UNA 3 two times when got 4,5, and sender will retransmit 3,4,5. It cost too much when only use ACK, for example, sender send 1,2,3,4,5 while receiver got 1,2,4,5, receiver will reply ACK 1,2,4,5 for each received segment. KCP use better model of UNA and ACK, each packet use UNA but there is ACK packet when segment loss occurs. +There are two kinds of ARQ(Automatic Repeat reQuest) model responses: UNA (All segments before this number received, such as TCP) and ACK (The segment with this number received). For example, sender send 1,2,3,4,5 while receiver got 1,2,4,5. All segments will be retransmit for UNA, that is, receiver will reply UNA 3 two times when got 4,5, and sender will retransmit 3,4,5. It cost too much when only use ACK, receiver will reply ACK 1,2,4,5 for each received segment. KCP use better model of UNA and ACK, each packet use UNA but there is ACK packet when segment loss occurs. #### Flow Control