Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753123Ab0BHPEl (ORCPT ); Mon, 8 Feb 2010 10:04:41 -0500 Received: from mail-forward2.uio.no ([129.240.10.71]:46022 "EHLO mail-forward2.uio.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752890Ab0BHPEk (ORCPT ); Mon, 8 Feb 2010 10:04:40 -0500 X-Greylist: delayed 2155 seconds by postgrey-1.27 at vger.kernel.org; Mon, 08 Feb 2010 10:04:40 EST Message-ID: <4B701EDC.7040109@simula.no> Date: Mon, 08 Feb 2010 15:25:32 +0100 From: Andreas Petlund User-Agent: Thunderbird 2.0.0.23 (X11/20090817) MIME-Version: 1.0 To: "netdev@vger.kernel.org" CC: =?ISO-8859-1?Q?Ilpo_J=E4rvinen?= , Eric Dumazet , Arnd Hannemann , LKML , shemminger@vyatta.com, David Miller , william.allen.simpson@gmail.com Subject: [net-next PATCH v2 1/3] net: TCP thin-stream detection Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-UiO-Ratelimit-Test: rcpts/h 16 msgs/h 2 sum rcpts/h 16 sum msgs/h 2 total rcpts 733 max rcpts/h 37 ratelimit 0 X-UiO-Spam-info: not spam, SpamAssassin (score=-5.0, required=5.0, autolearn=disabled, UIO_MAIL_IS_INTERNAL=-5, uiobl=NO, uiouri=NO) X-UiO-Scanned: 07904D0FFB1A361AD0502B16E68818F68BD43845 X-UiO-SPAM-Test: remote_host: 128.39.37.254 spam_score: -49 maxlevel 80 minaction 2 bait 0 mail/h: 13 total 18727 max/h 66 blacklist 0 greylist 0 ratelimit 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1284 Lines: 41 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 Date: Mon, 8 Feb 2010 14:05:24 +0100 Subject: [PATCH 1/3] net: TCP thin-stream detection Signed-off-by: Andreas Petlund --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/