Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756120Ab1ESHHb (ORCPT ); Thu, 19 May 2011 03:07:31 -0400 Received: from mail-yi0-f46.google.com ([209.85.218.46]:34146 "EHLO mail-yi0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755346Ab1ESHHa (ORCPT ); Thu, 19 May 2011 03:07:30 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; b=GuNRgSw/llsx+fMIgp0b0tQH5MFL21G03H1nnoDBadp04HyLoX+e2OUw7gvBZ+HyuJ APX2WSaA/iI3zUbhoDSq7ntXmn7csinpX0RJ3+e9Fg3P2rmXEe76Nh4vrH8oAA08F+F8 IB92NA2ATkAUWEHnlAHR5etDEbDoGokKRbih4= MIME-Version: 1.0 In-Reply-To: <8C5DF277-320D-4DEB-A133-EEC301DE58DC@comsys.rwth-aachen.de> References: <1305771744-83951-1-git-send-email-tsunanet@gmail.com> <20110518.223622.1525088601595365235.davem@davemloft.net> <20110519.001426.2119532755281545481.davem@davemloft.net> <9DC9A4D5-8E16-4361-B323-C92D563171A1@comsys.rwth-aachen.de> <8C5DF277-320D-4DEB-A133-EEC301DE58DC@comsys.rwth-aachen.de> From: tsuna Date: Thu, 19 May 2011 00:07:09 -0700 Message-ID: Subject: Re: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02. To: Alexander Zimmermann Cc: David Miller , kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@trash.net, hagen@jauu.net, eric.dumazet@gmail.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 836 Lines: 20 On Wed, May 18, 2011 at 11:52 PM, Alexander Zimmermann wrote: >> So we're talking about a [200ms ; 120s] range no matter what. > > Why is 200ms a valid lower bound for initRTO? I'm aware of > measurements that 1s is save for Internet, but I don't know of any > studies that 200ms is save... The constants that are quoted aren't specific to the initRTO. They're used to bound the RTO as it gets adjusted during the TCP session. See `tcp_set_rto' in tcp_input.c for reference. -- Benoit "tsuna" Sigoure Software Engineer @ www.StumbleUpon.com -- 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/