From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 5392421F2EF for ; Thu, 11 Jun 2015 04:24:40 -0700 (PDT) Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 485D035998B; Thu, 11 Jun 2015 11:24:40 +0000 (UTC) Received: from localhost (ovpn-116-130.ams2.redhat.com [10.36.116.130]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t5BBOaCv030924; Thu, 11 Jun 2015 07:24:37 -0400 Date: Thu, 11 Jun 2015 13:24:34 +0200 From: Jesper Dangaard Brouer To: Sebastian Moeller Message-ID: <20150611132434.564c382c@redhat.com> In-Reply-To: References: <5572F7E0.3060602@darbyshire-bryant.me.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 Cc: Jonathan Morton , bloat Subject: Re: [Bloat] ADSL, ATM drivers, bloat, education & confusion 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: Thu, 11 Jun 2015 11:25:09 -0000 On Sat, 6 Jun 2015 16:30:51 +0200 Sebastian Moeller wrote: > On Jun 6, 2015, at 15:53 , Jonathan Morton wrote: > > > You will need to set the overhead calculation correctly, probably > > using "pppoa-vcmux" or similar, depending on precisely what > > encapsulation your ISP uses. If you're not confident about that, > > specify "conservative" to begin with. > > I can be of help to measure the overhead empirically, if you > are willing to dedicate a few hours on an otherwise quiescent link to > gather some ICMP data, just let me know. It would be really cool if someone developed a (simple) tool that could probe (a quiescent) ADSL/ATM link, and report the encapsulation overhead (AFAIKR there are 12 different encap combi-types on ADSL). -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer