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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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