linux-kernel - [PATCH 1/3] net: TCP thin-stream detection

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Date:	Tue, 27 Oct 2009 17:31:49 +0100
From:	Andreas Petlund <apetlund@...ula.no>
To:	netdev@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, shemminger@...tta.com,
	ilpo.jarvinen@...sinki.fi, davem@...emloft.net
Subject: [PATCH 1/3] net: TCP thin-stream detection

Inline function to dynamically detect thin streams based on the number of packets in flight. Used to trigger thin-stream mechanisms.


Signed-off-by: Andreas Petlund <apetlund@...ula.no>
---
 include/net/tcp.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 03a49c7..7c4482f 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -800,6 +800,14 @@ static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp)
 	return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH;
 }
 
+/* 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(const struct tcp_sock *tp)
+{
+	return tp->packets_out < 4;
+}
+
 /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
  * The exception is rate halving phase, when cwnd is decreasing towards
  * ssthresh.
-- 
1.6.0.4


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