From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.17.20]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mout.gmx.net", Issuer "TeleSec ServerPass DE-1" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id A4F1921F5F7 for ; Sat, 26 Jul 2014 04:01:09 -0700 (PDT) Received: from hms-beagle.lan ([134.2.89.70]) by mail.gmx.com (mrgmx101) with ESMTPSA (Nemesis) id 0MMGWH-1X9dLM14Kz-0084yP; Sat, 26 Jul 2014 13:01:01 +0200 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) From: Sebastian Moeller In-Reply-To: Date: Sat, 26 Jul 2014 13:01:02 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Wes Felter X-Mailer: Apple Mail (2.1878.6) X-Provags-ID: V03:K0:tOAY2Fe7MbMmdjO4tqTQavLuvz/fw/1IBVJOsqciKsXPEExVWyd YV51tB0i7RdrWVU5Q7x9/M6mgaXSiRDzWEDiysAq6nYy9N4GC45ZJCy66bWF0Rke0Ej1pOf uXLwkuXDNo534w2tp7WPYnE13OXk2zhm2l9qw6dzc1wrKJSozHsXqPPBnXjLd1nEVdPOEMa f6+Q5JnpiYBaesUvefqow== Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] Ideas on how to simplify and popularize bufferbloat control for consideration. X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Jul 2014 11:01:10 -0000 Hi Wes, On Jul 25, 2014, at 22:48 , Wes Felter wrote: > The Netgear stock firmware measures bandwidth on every boot or link up = (not sure which) and I would suggest doing the same for CeroWRT. >=20 > Do you need to measure Internet bandwidth or last mile bandwidth? I think you want the bandwidth of the usual bottleneck, on DSL = that typically is the actual DSL-link to the DSLAM (even though the = DSLAM is oversubscribed typically its upstream link is not congested=85). = I think with DOCSIS it is the same. Realistically bandwidth measurement = are going to be sporadic, so this will only help with pretty constant = bottlenecks anyway, no use in trying to track, say the DSLAM congestion = that transiently happens during peak use time... > For link bandwidth it seems like you can solve a lot of problems by = measuring to the first hop router. And that would be sweet, but with DT=92s network the first hop = does not respond to ICMP probes, nor anything else under end user = control, also the bottleneck might actually be in the BRAS, which can be = upstream of the DSLAM. What would be great is if all CPE would return = the current link rates per SNMP or so=85 Or if DSLAMs and CMTSs would = supply data sinks and sources for easy testing of good-put. > Does the packer pair technique work on TDMA link layers like DOCSIS? Toke and Dave dug up a paper showing that packet pair is not an = reliable estimator for link bandwidth, So one could send independent = packet of differing size, but then one needs to synchronize the clocks = somehow=85=20 Best Regards Sebastian >=20 > --=20 > Wes Felter >=20 >=20 > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel