From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ey0-f171.google.com (mail-ey0-f171.google.com [209.85.215.171]) (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 E895A201906 for ; Tue, 11 Oct 2011 06:33:18 -0700 (PDT) Received: by eyb6 with SMTP id 6so3886082eyb.16 for ; Tue, 11 Oct 2011 06:33:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:subject:from:to:cc:date:in-reply-to:references :content-type:x-mailer:content-transfer-encoding:mime-version; bh=xFaRHSe8ILQo4ncp9dYWTfdmJgg4D7KgUta26cycsEU=; b=wpBW1IUDrEAemI1cDX75nZkhmwpfsdP2fAZcbVxbjbzfp1y5gZ2o7lq2gto8MmLpHC wRbKW3ut0ZlcLN/sS62KueswQWlzfjyTm4ycKQbdl718tMvkrP1s6kBiZt7aco1Sa0og EE2v8X0+lehgDinw+CjSEajMVLZ99nMbMku+c= Received: by 10.213.28.78 with SMTP id l14mr291089ebc.19.1318339995778; Tue, 11 Oct 2011 06:33:15 -0700 (PDT) Received: from [10.150.51.213] (gw0.net.jmsp.net. [212.23.165.14]) by mx.google.com with ESMTPS id f56sm48994237eea.0.2011.10.11.06.33.14 (version=SSLv3 cipher=OTHER); Tue, 11 Oct 2011 06:33:14 -0700 (PDT) Message-ID: <1318340013.2538.30.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> From: Eric Dumazet To: David =?ISO-8859-1?Q?T=E4ht?= Date: Tue, 11 Oct 2011 15:33:33 +0200 In-Reply-To: <4E94408A.4030709@gmail.com> References: <4E941A05.2050705@gmail.com> <20111011115816.GA24956@uio.no> <1318335234.2538.9.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <1318335509.2538.11.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <4E943FF7.5020208@gmail.com> <4E94408A.4030709@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.0- Content-Transfer-Encoding: 8bit Mime-Version: 1.0 Cc: bloat@lists.bufferbloat.net Subject: Re: [Bloat] the observed sack oddity X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Oct 2011 13:33:19 -0000 Le mardi 11 octobre 2011 à 15:11 +0200, David Täht a écrit : > Of course, it would help if I posted a link to the screenshots! > > http://www.teklibre.com/~d/sackoddity/ > > On 10/11/2011 03:09 PM, David Täht wrote: > > I have put up screenshots of tcptrace -G and xplot.org's analysis of my > > most recent capture of an ipv6 connection over freebox (wired) from a > > debloat-testing kernel here in france (pre 3.1 by a lot) to a 2.6.16 > > kernel (the aformentioned netsonar box) in redwood city, ca, both > > running tcp cubic, over ipv6. > > > > at first glance, it looked a lot like a classic bufferbloat trace, with > > complete with periodic collapses and cubic increasing the window. > > > > Then I noticed the sacks. > > > > I also have a trace taken between the debloat-testing box and a cerowrt > > box (running linux 3.04), both running westwood, which shows > > considerably less undesirable behavior, and I will repeat that test with > > cubic this evening and post additional data tomorrow morning. Who is the sender ? Is some WIFI involved ? "netstat -s" on the receiver would help This might be a truesize mismatch.