From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ia0-f178.google.com (mail-ia0-f178.google.com [209.85.210.178]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 8A06B21F18C for ; Fri, 21 Dec 2012 02:54:08 -0800 (PST) Received: by mail-ia0-f178.google.com with SMTP id k25so3705502iah.23 for ; Fri, 21 Dec 2012 02:54:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=OcOy5oQP2KAsFSFfV8N6RgXmlPWUNi02lQWgpq8fxmE=; b=ePaqdV9rsClO86nltUskETgE3+idSY6+t3vcrcKc/d6oJVrFkPdt7XMhIJrXTGEa2e cSMa5OEecbMEgAA6+ZauDWFzqYoGfs+ygTi2aeqeat7cprcNZp4Zb/bAEJYHD+8FP52i H7dTFrYb6qwnKz5gD42hsiVN0Di+oDm2pLDYGvSanI98NmwdRZVfRp6raTZh9Wnucj2R SCu9ZXPXUs2OiuOOmbtz1yZ6tJ4F0GE/Z9imduL/DfnhkCX9ndcpKelHniUJU9eMAzUN yDt3DoG5zoctg/Z4Pr0EtWCgGumESQmDHUQbrdjuUwdj76hOlu0FkU5TtddO0BhpHmxk OCzQ== MIME-Version: 1.0 Received: by 10.42.215.10 with SMTP id hc10mr11433856icb.19.1356087247851; Fri, 21 Dec 2012 02:54:07 -0800 (PST) Received: by 10.64.135.39 with HTTP; Fri, 21 Dec 2012 02:54:07 -0800 (PST) In-Reply-To: References: Date: Fri, 21 Dec 2012 05:54:07 -0500 Message-ID: From: Dave Taht To: Alessandro Bolletta Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "Codel@lists.bufferbloat.net" Subject: Re: [Codel] R: Making tests on Tp-link router powered by Openwrt svn X-BeenThere: codel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: CoDel AQM discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Dec 2012 10:54:08 -0000 To be more clear here; You outlined your setup as: laptop <- TPLINK <- gigE switch <- server And your path for attempting fq_codel is on a samba download from the server. So it hits the gigE switch, gets buffered up and dropped there, and then has a clear path the rest of the way to your laptop. The reverse path is clean (you are just sending 66 byte acks, so there is no bottleneck in that direction). So to get some benefit from fq_codel in this situation you would have to put a rate limited *ingress qdisc on the TPLINK (using qos-scripts or simple_qos), and even then a lot of drops would happen in the gigE switch on bursty traffic. If you were instead doing an upload to the server from the laptop, merely having fq_codel on there would keep your latency under upload sane. Hope this helps. --=20 Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.= html