netdev - [PATCH] tcp: for tcp westwood

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Message-ID: <alpine.WNT.2.00.1001041709170.3252@jhhwang>
Date:	Mon, 4 Jan 2010 17:18:49 +0900
From:	Jae-Hyun Hwang <jhhwang@...korea.ac.kr>
To:	netdev@...r.kernel.org
Subject: [PATCH] tcp: for tcp westwood

From: Jae-Hyun Hwang <jhhwang@...korea.ac.kr>

Current net/ipv4/tcp_westwood.c seems to be unnatural when compared with Westwood papers.
Since Linux TCP calls '.ssthresh' interface whenever packet loss is 
detected, it is more natural that the interface points to 'tcp_westwood_bw_rttmin' function, not Reno's function.
This patch also enables Westwood to perform its algorithm when CA_EVENT_LOSS event is generated as explained in the papers.

Signed-off-by: Jae-Hyun Hwang <jhhwang@...korea.ac.kr>

--- linux-2.6.32.2/net/ipv4/tcp_westwood.c.orig	2009-12-28 13:35:42.000000000 +0900
+++ linux-2.6.32.2/net/ipv4/tcp_westwood.c	2009-12-28 13:36:54.000000000 +0900
@@ -232,12 +232,7 @@ static void tcp_westwood_event(struct so
 		westwood_fast_bw(sk);
 		break;
 
-	case CA_EVENT_COMPLETE_CWR:
-		tp->snd_cwnd = tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
-		break;
-
 	case CA_EVENT_FRTO:
-		tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
 		/* Update RTT_min when next ack arrives */
 		w->reset_rtt_min = 1;
 		break;
@@ -274,9 +269,8 @@ static void tcp_westwood_info(struct soc
 
 static struct tcp_congestion_ops tcp_westwood = {
 	.init		= tcp_westwood_init,
-	.ssthresh	= tcp_reno_ssthresh,
+	.ssthresh	= tcp_westwood_bw_rttmin,
 	.cong_avoid	= tcp_reno_cong_avoid,
-	.min_cwnd	= tcp_westwood_bw_rttmin,
 	.cwnd_event	= tcp_westwood_event,
 	.get_info	= tcp_westwood_info,
 	.pkts_acked	= tcp_westwood_pkts_acked,
--
--
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