From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [IPv6:2001:67c:29f4::29]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 5CE4B21FE03 for ; Fri, 7 Aug 2015 07:23:41 -0700 (PDT) Received: from pannekake.samfundet.no ([2001:67c:29f4::50] ident=unknown) by cassarossa.samfundet.no with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1ZNiYb-0007uk-K2 for bloat@lists.bufferbloat.net; Fri, 07 Aug 2015 16:23:38 +0200 Received: from sesse by pannekake.samfundet.no with local (Exim 4.84) (envelope-from ) id 1ZNiYb-0006Pw-Gx for bloat@lists.bufferbloat.net; Fri, 07 Aug 2015 16:23:37 +0200 Date: Fri, 7 Aug 2015 16:23:37 +0200 From: "Steinar H. Gunderson" To: bloat@lists.bufferbloat.net Message-ID: <20150807142337.GA22258@sesse.net> References: <4EDA85BE-CD86-4DA9-8ED5-78500E858F79@baylink.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Operating-System: Linux 4.2.0-rc5 on a x86_64 User-Agent: Mutt/1.5.23 (2014-03-12) Subject: Re: [Bloat] Fwd: Did *bufferbloat* cause the 2010 flashcrash? 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: Fri, 07 Aug 2015 14:24:10 -0000 On Fri, Aug 07, 2015 at 02:13:20PM +0000, Livingood, Jason wrote: > while customers were using BitTorrent (which led the company down a bad > path to try to fix it but that¹s a long story). But what _is_ a good path to fix the BitTorrent problem[1]? I still haven't seen a real-life practical solution. LEDBAT is negated by fq_codel, DSCP markings don't work (they get stripped, and usually were not even set to begin with), switching to IP-level fairness makes life hard for the torrent user (not that it seems to even exist in fq_codel; and two-level fq_codel doesn't seem to exist either). DPI to single out torrent traffic? I think we've sort of tried that. :-) [1] For the purposes of the question, the “BitTorrent problem” is when you and I are on the same network, and your 200+ BitTorrent upload sessions makes it impossible for me to upload my single cat video to YouTube. /* Steinar */ -- Homepage: http://www.sesse.net/