From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm1-x329.google.com (mail-wm1-x329.google.com [IPv6:2a00:1450:4864:20::329]) (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 3B0EB3CB35 for ; Wed, 20 Mar 2019 03:20:33 -0400 (EDT) Received: by mail-wm1-x329.google.com with SMTP id e74so19262502wmg.3 for ; Wed, 20 Mar 2019 00:20:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heistp.net; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=ZFh+FJG1TjIuNTfwuU7hweok6fwXQsXQk3B50EtXRbo=; b=kNAQxkKz/XUEmlQxy9cLpO9BUENheALc4Y1Ndk1MUalpuMvImkqRTePM/Y6IWrnt61 aAlNLRuQXlgX7cq3JoOO/BAhOjHQJh640z78LIc1xlbDou5Jr9HTRrmxPK6rw27DItxh /FCGFpE485TGAMD2f0/awczxRLGn8j30mh1WbgRQQv7wvyOiqJg8Ib2L2tZgL/A+0p0e 0GvyNFyMyzZU4WMiqlN3591OJ38mxEDiFQ9zX4AKQWmobRjnrIgUZ4eo1WylDD5nhl7B 8wDvpvQf0V7RmPZPX9pGcUa+F3jHb+UwrrX9n8H4Owi1QCqL1hYrNpf5UkYt6ixfwK++ evqg== 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=ZFh+FJG1TjIuNTfwuU7hweok6fwXQsXQk3B50EtXRbo=; b=sE7ZRsHFR3rmBnp8f+eH+R+wr6ZAsjWGvHZAJW/WMdEPf0UzY42IPEzOZLv6s3XNhz 23COscyP9qAlib9xf8I8l56rqt2y7EMoY191jG3I6/s2VXz/8GVU2hVMIDfK5YM3KRrL U0g7FwwK/ju9WkFaQ0N4cNeOhlea7Cma5AochgCbPel+qX1WzLx/84wW+oYqFo7dSLdb qqrOrajgWCLSQzwej5fktd9PIb77YiExYZbUlSuCbAuvnI0NBQqqrimAlqJnlvdeHtQ4 qYwSaGRFUz9Fz4WCydXMn3G3sGx+he/Hagr77RGIXPZcJ27fLhvUiLuKc+NgCKzEwXxJ yXXQ== X-Gm-Message-State: APjAAAUkngEG7GHY0tZhxdnCkDykWaXslWOBIrFY1zOtr1xvaoVqG9f2 j6st2ltUoUSOi4TJClaFrC+p6Q== X-Google-Smtp-Source: APXvYqzSI3vCo3nt6zTXHmLR/3DjkUOzkHni6q2qCqD4vg+eZVoSHy9gD/3eFTmBzI7SUg13i2/VYw== X-Received: by 2002:a1c:2348:: with SMTP id j69mr6881036wmj.35.1553066432326; Wed, 20 Mar 2019 00:20:32 -0700 (PDT) Received: from tron.luk.heistp.net (h-1169.lbcfree.net. [185.193.85.130]) by smtp.gmail.com with ESMTPSA id 3sm1214638wrk.68.2019.03.20.00.20.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 Mar 2019 00:20:31 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Pete Heist In-Reply-To: <196CD487-B489-4C13-A13A-D005DE0457C5@gmail.com> Date: Wed, 20 Mar 2019 08:20:30 +0100 Cc: ecn-sane@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: References: <4D0CB5F2-93DD-4072-81C8-96F8ECAC870D@heistp.net> <196CD487-B489-4C13-A13A-D005DE0457C5@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Ecn-sane] cctrace prototype X-BeenThere: ecn-sane@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussion of explicit congestion notification's impact on the Internet List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Mar 2019 07:20:33 -0000 > On Mar 20, 2019, at 4:42 AM, Jonathan Morton = wrote: >=20 >> On 20 Mar, 2019, at 2:41 am, Pete Heist wrote: >>=20 >> https://www.heistp.net/downloads/cctrace/ >>=20 >> For each point, right arrow is used for upstream and left for = downstream. >>=20 >> You can see that the SCE signals start sooner before CE takes over, = which could theoretically prevent CE with a cooperating TCP. >=20 > Well, it's not *very* easy to see - but that is the idea in theory. = It might be easier to analyse such things (at this early stage of = development) with a single flow, or possibly a pair with staggered start = times. Easier to see when zoomed. Also the scale independent symbologies can be retina bending on modern = displays. I don=E2=80=99t think xplot.org makes any adjustments for = screen dpi. > One thing I'm noticing is that the SCE rate drops off very sharply = when the CE marking rate rises, but the latter doesn't read higher than = 50%. Check your axis scale and your window average function for = fenceposts. Ah, you=E2=80=99re probably expecting the proportion of packets carrying = each mark _in the same direction_, right? I can fix that. > I'd like to see a sequence plot with the ECN codepoint indicated by = colour coding, and similarly for ECE/NS/CWR on the ack path. Ok, this will mean either creating a new sequence plot in Go or getting = this into tcptrace, the former probably still being easier for me. > I'd also like to see a dynamic estimate of cwnd (or rather, in-flight = data), with similar colour coding and/or labelling, for correlation. I'll see if I can figure out how to estimate that. I=E2=80=99ll push what=E2=80=99s available so far later this morning, = needs some cleanup=E2=80=A6