From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp80.ord1c.emailsrvr.com (smtp80.ord1c.emailsrvr.com [108.166.43.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 1CD663B2A4 for ; Thu, 21 Jun 2018 09:16:25 -0400 (EDT) Received: from smtp19.relay.ord1c.emailsrvr.com (localhost [127.0.0.1]) by smtp19.relay.ord1c.emailsrvr.com (SMTP Server) with ESMTP id C482DA0400; Thu, 21 Jun 2018 09:16:24 -0400 (EDT) X-Auth-ID: jf@jonathanfoulkes.com Received: by smtp19.relay.ord1c.emailsrvr.com (Authenticated sender: jf-AT-jonathanfoulkes.com) with ESMTPSA id 7713EA02FF; Thu, 21 Jun 2018 09:16:24 -0400 (EDT) X-Sender-Id: jf@jonathanfoulkes.com Received: from jonathans-mbp.lan (h234.85.184.173.dynamic.ip.windstream.net [173.184.85.234]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384) by 0.0.0.0:587 (trex/5.7.12); Thu, 21 Jun 2018 09:16:24 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.4 \(3445.8.2\)) From: Jonathan Foulkes In-Reply-To: Date: Thu, 21 Jun 2018 09:16:23 -0400 Cc: bloat Content-Transfer-Encoding: quoted-printable Message-Id: <7C6CFE9E-7051-4CB5-8C03-6CA722D4E9C2@jonathanfoulkes.com> References: <03A702AD-5CC1-42CD-A9BF-783E3183AEF5@gmail.com> To: Sebastian Moeller , Rich Brown X-Mailer: Apple Mail (2.3445.8.2) Subject: Re: [Bloat] SQM Settings for Bonded DSL? 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, 21 Jun 2018 13:16:25 -0000 Hi Rich, Sebastian, Most bonded modems do a good job of making the line look just like a = single, higher-capacity line. The only major issues I=E2=80=99ve = observed is when the bonded lines have some asymmetry to them (e.g. one = link has weaker SNR), then the bond drops, re-synchs and continues. But = occasionally, it will run for extended periods at 50% capacity (i.e. on = only one of the lines). It uses PMT protocols, so not at all like mwan3, as any one connection = can achieve full throughput of the bonded set. I have data on hundreds of bonded lines, and other than the scenarios I = mentioned above about bad bonds, as far as SQM goes, it behaves just = like any other DSL line of equal capacity. So all the same guidelines = would apply. I hope that helps, Jonathan Foulkes > On Jun 21, 2018, at 7:14 AM, Sebastian Moeller = wrote: >=20 > Hi Rich, >=20 >=20 >=20 >> On Jun 21, 2018, at 13:08, Rich Brown = wrote: >>=20 >> Hi folks, >>=20 >> Our local DSL ISP (Consolidated Communications, Inc, formerly = Fairpoint) recently installed a Smart/RG SR555ac = (https://www.smartrg.com/sr555ac) bonded ADSL2 modem. >>=20 >> I seem to remember earlier messages stating that the dual queues in = the DSL modem screwed up (or, de-optimized) the SQM in the router.=20 >=20 > As far as I can see this should not really cause an issue = (besides that latency for single packets will be limited by the fact = that you have two half-total-bandwidth links) except maybe that there = might be additional overhead for the bonding on the link, but I have = never looked at channel bonding so this is pure spekulation. I assume = here that your Modem handles the bonding transparently. I could envision = that running an non-transparent load-balancer (like with mwan3 under = openwrt) might introduce issues for sqm, but if all you see is one = ethernet link to the modem I do not expect any major quirks (except = latency not being in line with the expectancy from total bandwidth). >=20 >>=20 >> The web GUI does provide info on SNR, sync rates, etc. Any advice for = SQM beyond the standard, "measure the no-SQM speed, then start at 5% = below..."? Thanks. >=20 > I am curius myself and would like to ask you to keep me/the list = posted on whatever you find out about the applicability of sqm to = bonding. >=20 > Best Regards > Sebastian >=20 >=20 >>=20 >> Rich >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat >=20 > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat