From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-x234.google.com (mail-lb0-x234.google.com [IPv6:2a00:1450:4010:c04::234]) (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 74EA93B4A4 for ; Wed, 20 Apr 2016 22:22:58 -0400 (EDT) Received: by mail-lb0-x234.google.com with SMTP id os9so19296712lbb.2 for ; Wed, 20 Apr 2016 19:22:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=nPRATjJfOKuKA48lZtsGPiwiq6YeVOr0kyeYFQZ/+vg=; b=wJFS8qT4eZKpdWUBexDq1neRr1z3JHdH7WXegdmJ/bQ6gMI8GD0X6GTgVls7dKl6cc QSF2Y45kNwefQ5Y6n1W5pYOtz/v+RzOA5xR+Hk0GSiqqmWEaQ/vV02kY5+KoGR6fj2uq Wx4eVFSoUbyUGR7qKB82c8xKdW66Lh+vGH/rfStJpNNJ68Jd58j5i0GZ2YUp7L4agZdd U/PqVwZKvQ8+NVf28KaXtF1eB/MFciU/M+n/l3ZSrcsUYCCJAhW9LvUgZaQWIJCeBDDV uAZUcQh7Ia9lqz70FMrhPB7IfFpxRhunANEcsgwZcyqq/Qt6AjzSLZ3TXsQOSOkQSsAm aywA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=nPRATjJfOKuKA48lZtsGPiwiq6YeVOr0kyeYFQZ/+vg=; b=TwPpEVpu+M2T9zToFXILK9qjfFPj6qPk5yxem5TNN0cPrfAF6fkWQyKRgLHiXbr/wo RfiU45pnor88hWmSPQFmwToiADQZStTKTuTMuyhGpyF9i3NddpI5npuvLp8IyA/St7xC B6k3eJ6w9ZESOOgI9eFfgKlAkwPsju/vLKivpNQYzJclwqdCZKQsnKiI6ITVFwyiykrm 5Z+XQ9FkV5zaMFbXzrrTe9FRBy0CECTZO79jcCcIoxVh3m4EYXKmXpk7Fhj8fLyQLite m/iElcCV0GANzs8Wtm6QJJiUpdPAnlw6byrFtZYPPHHrHqN/X8ktJhUTMk8zaNJWVO/8 y0/w== X-Gm-Message-State: AOPr4FXGYCKKtr7i/t76xucbv6+tWqScDqHPZnPcwUb+Y+a+CF24n+s9bf7Uc5T/N3ASlQ== X-Received: by 10.112.51.8 with SMTP id g8mr4203391lbo.109.1461205376765; Wed, 20 Apr 2016 19:22:56 -0700 (PDT) Received: from bass.home.chromatix.fi (37-33-67-252.bb.dnainternet.fi. [37.33.67.252]) by smtp.gmail.com with ESMTPSA id p195sm77556lfd.11.2016.04.20.19.22.54 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 20 Apr 2016 19:22:56 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: Date: Thu, 21 Apr 2016 05:22:51 +0300 Cc: "Livingood, Jason" , bloat Content-Transfer-Encoding: quoted-printable Message-Id: References: To: jb X-Mailer: Apple Mail (2.3124) Subject: Re: [Bloat] dslreports bufferbloat tests 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, 21 Apr 2016 02:22:58 -0000 > On 21 Apr, 2016, at 01:53, jb wrote: >=20 > So Is there anything different, or detectable, on the server side for > such a fully congestion aware connection, but no congestion is > encountered? This would imply that your server was unable to saturate the connection. = You should be able to infer this case by comparing the measured = throughput to your server=E2=80=99s capacity. > So on upload phase, I can see CE marks come in, but during download > phase there is nothing interesting to detect and log? Since the router handling the queue for the bottleneck link will likely = be different in each direction (in the simple case, one is at the ISP = and the other is in the subscriber=E2=80=99s home), it=E2=80=99s = entirely possible for one direction to be fully ECN-aware and AQMed at = the bottleneck, and the other to be completely bloated. In both cases, = the traffic will negotiate ECN (or not) the same way. Additionally, even if there are ECN-aware, AQMed queues on the path, = it=E2=80=99s the bottleneck queue that counts. It=E2=80=99s possible to = get some sporadic CE marks on a path where the major bottleneck link is = bloated, if the traffic passes through an ECN-aware pinch point which is = transiently congested. - Jonathan Morton