From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-x72f.google.com (mail-qk1-x72f.google.com [IPv6:2607:f8b0:4864:20::72f]) (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 96C413CB36 for ; Thu, 20 Sep 2018 18:24:51 -0400 (EDT) Received: by mail-qk1-x72f.google.com with SMTP id q20-v6so2657475qkc.12 for ; Thu, 20 Sep 2018 15:24:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=rLabIh717SBQJ9Vu/hHVmIxCjeoCJ8cmSwH1kl5+Du8=; b=MEcmSABIISGk/+nMvgnXirk8CIRzpz+i4Pl3AdggFSNRXPowzDDEE+LMZwNWehqHwB 6tnHGfM81sHQyLIZ/s2/WGmJ9XXK6AaLmBmhF3nb0QrdYB0mfWRuV/Zvoj3ZECDlQLd9 OR3qZlRWzx5FgZrROy71PPdozQBARrUL4o0FrNDSmdPT3hNiPKxCIJrRuTw2eMVGn/YX gopxE0q8b5rmyz5HDi6RCVKOC720IaR6JM7lWqjp+RXjg41uFX3MWV/WfpPpsJudRlCm mok7rugjby+kyVu4jWrOysO3NweW2us4+U88ZH/ZWr67ZyiNtgkg424ZoIAr7CgWOiwv Exrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=rLabIh717SBQJ9Vu/hHVmIxCjeoCJ8cmSwH1kl5+Du8=; b=dtW40RvIDxCrU3v4xf7pDcNOUE7jyXCWaAXSN//aPfYPi1E7dlfI2r56aDDQ+e/TEx 0gxCN5RkWUpQTbxTT4/dTmSbW64Sm3Gme8PqhUFkuHAX/Xn//rjftuVKw5y78o4UKqOT GsB7Z+RH5sAr6zoWZSxGPLbNSICQXpIJ6SXmhAQSKwYFu59Xv2qD32aVecT6GxpYSFDc aEdH4vsTU3EA5J8EiS0GXx+xIz8ODZCmvs4bpdLNKiBpFEzKUyHKrKHaGtKQRekPbyN9 Ur56KbN40MSU9H7tGH4snDKqUqMoBvzNDMYrsUon35PqkAAMBbeTPxI2zSEC7nhkJbWG o9yg== X-Gm-Message-State: APzg51DA0mDv5xru/ngN+dV7RpF3QH64W5N6sBwEAH2s2qUsSaCZO2cW JbXPLQqCOWdi2FL0gC+yrCcAxvl722vBsGLAmn0gMpFs X-Google-Smtp-Source: ANB0VdbZ8SLHGi7PcUH9bFRfKPRD30N7kIo39Zs6kOBDX64nvEAjEOaU907/4bVU+9TFY2w5BsW4SvAZeAesLnn83gQ= X-Received: by 2002:a37:4f4b:: with SMTP id d72-v6mr28556775qkb.17.1537482291113; Thu, 20 Sep 2018 15:24:51 -0700 (PDT) MIME-Version: 1.0 From: Dave Taht Date: Thu, 20 Sep 2018 15:24:39 -0700 Message-ID: To: flent-users , bloat Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: [Bloat] MIT's bufferbloat class 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, 20 Sep 2018 22:24:51 -0000 It's a bit flawed - not using https, nor a reasonable number of http assets, averaging the http result rather than plotting it also, with min/max... nor using flent, nor publishing their source widely so that I could fiddle with setting up mininet to verify it produces correct results... but, it's the first quiz on a class at MIT and it's hard to complain more than I just did. :) I'm very tempted to try to do this one on my own, as I strongly suspect the http result to be very misleading. http://web.mit.edu/6.829/www/currentsemester/psets/pset1/ps1.html * Start a long lived TCP flow sending data from h1 to h2. Use iperf. * Start back-to-back ping train from h1 to h2 10 times a second and record the RTTs. * Plot the time series of the following: *The long lived TCP flow's cwnd * The RTT reported by ping * Queue size at the bottleneck Spawn a webserver on h2. Periodically download the index.html web page using h1 and measure how long it takes to fetch it (on average). Repeat the above experiment and replot all three graphs after enabling the PIE AQM algorithm on the switch interface attached to the bottleneck link. Set the target delay for PIE to 20 ms. Repeat the above experiment with PIE enabled, but this time, start 10 parallel TCP flows with iperf. --=20 Dave T=C3=A4ht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619