From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from korolev.univ-paris7.fr (korolev.univ-paris7.fr [IPv6:2001:660:3301:8000::1:2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 3DDFF21F304 for ; Mon, 22 Jun 2015 08:55:49 -0700 (PDT) Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by korolev.univ-paris7.fr (8.14.4/8.14.4/relay1/56100) with ESMTP id t5MFtkE1024969; Mon, 22 Jun 2015 17:55:46 +0200 Received: from mailhub.math.univ-paris-diderot.fr (localhost [127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTP id D3A5461F9D; Mon, 22 Jun 2015 17:55:46 +0200 (CEST) X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr Received: from mailhub.math.univ-paris-diderot.fr ([127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id a6_JuqacNu-D; Mon, 22 Jun 2015 17:55:45 +0200 (CEST) Received: from pirx.pps.univ-paris-diderot.fr (unknown [78.194.40.74]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id 6F25D61F9A; Mon, 22 Jun 2015 17:55:45 +0200 (CEST) Date: Mon, 22 Jun 2015 17:55:46 +0200 Message-ID: <87vbefn3el.wl-jch@pps.univ-paris-diderot.fr> From: Juliusz Chroboczek To: Benjamin Cronce In-Reply-To: References: User-Agent: Wanderlust/2.15.9 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; format=flowed; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (korolev.univ-paris7.fr [194.254.61.138]); Mon, 22 Jun 2015 17:55:47 +0200 (CEST) X-Miltered: at korolev with ID 55883002.000 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)! X-j-chkmail-Enveloppe: 55883002.000 from mailhub.math.univ-paris-diderot.fr/mailhub.math.univ-paris-diderot.fr/null/mailhub.math.univ-paris-diderot.fr/ X-j-chkmail-Score: MSGID : 55883002.000 on korolev.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Status: Ham Cc: bloat Subject: Re: [Bloat] TCP congestion detection - random thoughts X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Jun 2015 15:56:18 -0000 To add to what my honourable prelocutors have said, µTP, which is used by modern BitTorrent implementations, uses the LEDBAT congestion control algorithm, which is based on delay. The fact that LEDBAT is crowded out by Reno is a desirable feature in this case -- you do want your BitTorrent traffic to be crowded out by HTTP and friends. https://en.wikipedia.org/wiki/LEDBAT -- Juliusz