netdev - [net-next PATCH v2 1/3] net: TCP thin-stream detection

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Date:	Mon, 08 Feb 2010 15:25:32 +0100
From:	Andreas Petlund <apetlund@...ula.no>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>, shemminger@...tta.com,
	David Miller <davem@...emloft.net>,
	william.allen.simpson@...il.com
Subject: [net-next PATCH v2 1/3] net: TCP thin-stream detection

Major change: Stopped stream from being detected as thin if in initial slow-start

>From 1c448f7c65a016ded7eedd44fe74874e5b3cdbc0 Mon Sep 17 00:00:00 2001
From: Andreas Petlund <apetlund@...ula.no>
Date: Mon, 8 Feb 2010 14:05:24 +0100
Subject: [PATCH 1/3] net: TCP thin-stream detection


Signed-off-by: Andreas Petlund <apetlund@...ula.no>
---
 include/net/tcp.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 87d164b..e5e2056 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1386,6 +1386,13 @@ static inline void tcp_highest_sack_combine(struct sock *sk,
 		tcp_sk(sk)->highest_sack = new;
 }
 
+/* Determines whether this is a thin stream (which may suffer from
+ * increased latency). Used to trigger latency-reducing mechanisms.*/
+static inline unsigned int tcp_stream_is_thin(struct tcp_sock *tp)
+{
+	return tp->packets_out < 4 && !tcp_in_initial_slowstart(tp);
+}
+
 /* /proc */
 enum tcp_seq_states {
 	TCP_SEQ_STATE_LISTENING,
-- 
1.6.3.3



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