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 TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id D0B583CB38; Wed, 4 Aug 2021 14:31:13 -0400 (EDT) Received: from potemkin.univ-paris7.fr (potemkin.univ-paris7.fr [IPv6:2001:660:3301:8000::1:1]) by korolev.univ-paris7.fr (8.14.4/8.14.4/relay1/82085) with ESMTP id 174IVB5P029406 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 4 Aug 2021 20:31:11 +0200 Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by potemkin.univ-paris7.fr (8.14.4/8.14.4/relay2/82085) with ESMTP id 174IVADJ016928; Wed, 4 Aug 2021 20:31:10 +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 6C860C33D7; Wed, 4 Aug 2021 20:31:10 +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 QJTSmcdPpATc; Wed, 4 Aug 2021 20:31:09 +0200 (CEST) Received: from pirx.irif.fr (unknown [78.194.40.74]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id 2A87CC33D5; Wed, 4 Aug 2021 20:31:09 +0200 (CEST) Date: Wed, 04 Aug 2021 20:31:08 +0200 Message-ID: <87wnp1kqoj.wl-jch@irif.fr> From: Juliusz Chroboczek To: Mikael Abrahamsson Cc: Sebastian Moeller , starlink@lists.bufferbloat.net, Jonathan Morton , Mikael Abrahamsson via Bloat In-Reply-To: References: <058681B8-89EB-42ED-8E82-4048BA3C9504@cable.comcast.com> <649DC4B024D74B8BA6926ABFCD52DC79@SRA6> <5C65BC6E-1ABD-4432-B2CE-AC8BACDA363D@gmx.de> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.1 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (korolev.univ-paris7.fr [IPv6:2001:660:3301:8000::1:2]); Wed, 04 Aug 2021 20:31:11 +0200 (CEST) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (potemkin.univ-paris7.fr [194.254.61.141]); Wed, 04 Aug 2021 20:31:11 +0200 (CEST) X-Miltered: at korolev with ID 610ADCEF.001 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)! X-Miltered: at potemkin with ID 610ADCEE.000 by Joe's j-chkmail (http : // j-chkmail dot ensmp dot fr)! X-j-chkmail-Enveloppe: 610ADCEF.001 from potemkin.univ-paris7.fr/potemkin.univ-paris7.fr/null/potemkin.univ-paris7.fr/ X-j-chkmail-Enveloppe: 610ADCEE.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 : 610ADCEF.001 on korolev.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Score: MSGID : 610ADCEE.000 on potemkin.univ-paris7.fr : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Status: Ham X-j-chkmail-Status: Ham Subject: Re: [Starlink] [Bloat] Of interest: Comcast AQM Paper X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Aug 2021 18:31:14 -0000 Hi Mikael, > If it's not hw accelerated, it sucks. Fortunately, that hasn't been true in a long time. Two data points. The WND3700v2/WNDR3800, which is now over ten years old, can easily forward 400Mbit/s NATed IPv4 (max-sized packets) in software. To be fair, it can saturate 1Gbit/s with hardware offload. A Cortex-A53 SoC at 1GHz with correctly designed Ethernet (i.e. not the Raspberry Pi) can push 1Gbit from userspace without breaking a sweat. I agree with you that hardware acceleration has a number of advantages, but given the speed of modern embedded chips, there is no longer much reason to give up the flexibility and ease of development of pure software solutions just to save a couple hundred mW, at least not until we get 10Gbit/s CPEs. -- Juliusz