From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 4EDB4201B52; Wed, 9 May 2012 23:54:56 -0700 (PDT) Received: by wgbfa7 with SMTP id fa7so830143wgb.28 for ; Wed, 09 May 2012 23:54:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; bh=npgmzK2pDO+QxsUpXl3HF+QL5Q4ICUTFonnBijmiCnQ=; b=PRHIFW6qi5/URL/PdN+MgaJfgwbo0Ci6KzzHb83xJWyo8gghiDyaGF1GHPQ0Ejh0V9 9ebL539NhwwTXE0qrpmBxgRGJHz7Pv2Kub6vduy5b6BDKqgQgaDri1n3fexACy6Mt88N ImmCEhdN/QWjDWJZV6hs01KoBJKzycxbUNyxrZIXrlOUZiehXjx6xhCS1ddc82G3kKZ/ 36JyJFJEqsQCo4MWRNgd7lf7rR+ZwTM84RLesVoJIN6uSnDDHitmOS0BWGTt13gcTnn6 ksz4KkTTgDgQ/GdAoPyIiLAJt0zlTecLO+03Ua9gIMQdZI4oRs8AoYuzt2AWCtyswFVL U7NA== Received: by 10.180.102.3 with SMTP id fk3mr6683767wib.9.1336632894418; Wed, 09 May 2012 23:54:54 -0700 (PDT) Received: from [192.168.1.4] (xdsl-83-150-84-172.nebulazone.fi. [83.150.84.172]) by mx.google.com with ESMTPS id fm1sm1318572wib.10.2012.05.09.23.54.52 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 09 May 2012 23:54:53 -0700 (PDT) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Jonathan Morton In-Reply-To: <1336631707.27520.136.camel@shinybook.infradead.org> Date: Thu, 10 May 2012 09:54:51 +0300 Content-Transfer-Encoding: quoted-printable Message-Id: References: <532BA404-30FF-4395-9575-709A68E4C723@gmail.com> <1336631707.27520.136.camel@shinybook.infradead.org> To: David Woodhouse X-Mailer: Apple Mail (2.1084) Cc: codel@lists.bufferbloat.net, bloat Subject: Re: [Codel] [Bloat] The challenge X-BeenThere: codel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: CoDel AQM discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 May 2012 06:54:57 -0000 On 10 May, 2012, at 9:35 am, David Woodhouse wrote: >>> So overall we have an AQM that provides a low-latency signal of = appropriate magnitude to TCPs when the link is genuinely congested, and = gets out of the way when it isn't. Combined with a fair queueing = discipline (eg. SFQ or QFQ), I think this will turn out to be an = excellent default setting for all sorts of equipment. What would it = take to get this into a DSL modem (at either end of the link)? >>=20 >> David Woodhouse tossed a copy of the paper on his machine before >> getting on a plane. He's been working on a ADSL device for quite some >> time. I don't know if he and his box are together, or separated. >=20 > Separated by about five thousand miles right now; I'll be home on > Monday; awake by Tuesday. OpenWrt supports a bunch of ADSL modems, > including the shiny dual-port Traverse Geos that I'm using at home. = It's > running OpenWrt trunk, and it's simple enough for me to update the > kernel. I want to buy a modem that I can put Linux on, and that supports ADSL2+ = Annex M. Where can I get one? Vaguely acceptable solutions include CardBus or PCI/PCIe slot modems to = put in a PowerBook or a PC. I have enough spare hardware to make that = work, and the lines here are underground and so not susceptible to = lightning. > As for the *ISP* end of the link, we could talk to the ISP about that. > Their LNS isn't running Linux though; it's their own code. I suppose the downstream side of ADSL is less vexing for now. = Eventually AQM and FQ needs to be in the DSLAM and cell tower by = default, though. I might have mentioned previously what my local cell tower is like - 30+ = seconds (at 500Kbps) of tail-drop FIFO. Yuck. - Jonathan Morton