From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x130.google.com (mail-lf1-x130.google.com [IPv6:2a00:1450:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id D55893B2A4 for ; Thu, 24 Oct 2019 08:14:28 -0400 (EDT) Received: by mail-lf1-x130.google.com with SMTP id 21so10013841lft.10 for ; Thu, 24 Oct 2019 05:14:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=BV8NCmGYF0jxXJifSHDYEaPpxWlua+o0HGwGO58Ikg4=; b=sckrB/l8rGsjjME0EYTTVCm2wCdq4PjgvLAQe/JD6toXn5lSwRiRg14Qb8soAzNOme VlPTfdM8vku/en1EVZGBxlH/TpsatcSnVprLMAPIInw7jyiQBpQSX4s+2R5VCHnUnTf2 i0IMs7mllJZs3Jqi0WtBje4diezDHNg6uM9YFupSq8W/Sfb1pP38pAmiW7dTMB+5546e 1K2hC0DxBdE7iWpBVst/Kumjd+2PS3fPOLMrtfTnj9pzjyziQjtnvMocrCZhJX1JvGId d8lY77tZhf8/gRd1F5LCx7jhYDnbtHEdjXGMdRkBhVPeKU+dWtWXkhfgFVQKswsiaXab ZgLA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=BV8NCmGYF0jxXJifSHDYEaPpxWlua+o0HGwGO58Ikg4=; b=FjR0NgJN7Oiw8WA0cFOLeR40hYdicBZ9kwDPv9fVfU0ixI2bMZ1Em+jGPPWhyTLQ+A OT/U9AvlaXfYzuFolmR0+hSu7vp/YuU7WHupEHEkpOderMNbPWrKiNZWLqhKhDEuOS59 cF1Qx0tRyvCwSVjfGpMnetQz0/hFCPcJ3K3DchunaVXlSE5sH8BPZwfstoA30VUwYeSQ SKSpsWRNiOmr8VgVdKab+LWmB3aZLIg5Lazs7SstoVG9ci/PyPQyxZYMrKywGdIaQJBs j6OXvh5P9SrETaMaqbC2q6r8IEt5L1EZnoSfUz8fSd+tnQWidUeKBFLCeGbpS0/+tsFt xpng== X-Gm-Message-State: APjAAAUadDzR8dgTlKVv88N7xEoNXyqqaqF5lsNmQa/T4Oq+3m1sTkGe wsAFZQ9eIuD/GKNjYQmB6sc= X-Google-Smtp-Source: APXvYqxF0sMpzIREIDfgQGrfhxlj1GjzDiIqsHsGRqoqXT/Ii8Eq2pnbhN3NvIfDNsdF0aXRpchlUQ== X-Received: by 2002:ac2:42c7:: with SMTP id n7mr25910429lfl.138.1571919267712; Thu, 24 Oct 2019 05:14:27 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-240-171-nat-p.elisa-mobile.fi. [83.245.240.171]) by smtp.gmail.com with ESMTPSA id t27sm16731756lfl.54.2019.10.24.05.14.26 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Oct 2019 05:14:26 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: <1571917896021.11761@telenor.com> Date: Thu, 24 Oct 2019 15:14:25 +0300 Cc: bloat@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <92FE162A-653A-4E6B-BC2F-3A2AB873939E@gmail.com> References: <0876C235-C6D3-42B0-9D93-114DB75D4204@gmail.com> <1571917896021.11761@telenor.com> To: erik.taraldsen@telenor.com X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Bloat] Bufferbloat on 4G Connexion X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Oct 2019 12:14:29 -0000 > On 24 Oct, 2019, at 2:51 pm, = wrote: >=20 >> The key thing in both BQL and AQL is that instead of treating all = packets the >> same, you account for how long it will take to transmit them. >>=20 >> In Wifi, your transmission rate can vary by a factor of 1000x (1Mb to = over 1Gb >> per second), so just counting bytes as BQL does is no longer good = enough. >>=20 >> how much does the actual over-the-air transmission rate vary in 4G? = I'd bet that >> it varies less than wifi does because wifi must retain compatibility = with the >> earliest equipment while 4G no longer supports 2G protocols. >=20 > So in a scenario with a fixed (wall mounted outdoor unit) LTE device = BQL could work=20 > quite well as the radio will not fluctuate too much. =20 >=20 > But for a mobil "pocket router" being carried around an AQL approach = would be needed? =20 Even in a fixed application, there's a lot of variation in where the = unit is installed - from practically underneath the cell site tower to = several miles away behind some trees - and service outages at the = primary cell site could cause large, temporary changes of link bandwidth = as the unit switches to a more distant cell. Also, over the course of a = day I personally observe tenfold variations in available bandwidth due = to congestion at peak times, though I'm not quite certain whether that's = due to radio contention on this particular cell site, or on my ISP's = backhaul. AQL would correct for these variations automatically. All it needs in = addition to BQL is some indication of how many bytes are appropriate to = queue in the hardware at any given moment. - Jonathan Morton