From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.taht.net (mail.taht.net [176.58.107.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 60A2A3B2A4 for ; Mon, 16 Oct 2017 16:26:59 -0400 (EDT) Received: from nemesis.taht.net (unknown [IPv6:2603:3024:1536:86f0:2e0:4cff:fec1:1206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.taht.net (Postfix) with ESMTPSA id 1FD4F21425; Mon, 16 Oct 2017 20:26:57 +0000 (UTC) From: Dave Taht To: Martin Geddes Cc: bloat References: Date: Mon, 16 Oct 2017 13:26:56 -0700 In-Reply-To: (Martin Geddes's message of "Wed, 11 Oct 2017 14:00:04 +0100") Message-ID: <87y3oaq1nz.fsf@nemesis.taht.net> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Subject: Re: [Bloat] Bufferbloat in high resolution + non-stationarity 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: Mon, 16 Oct 2017 20:26:59 -0000 Sorry for the late reply. Martin Geddes writes: > Folks, > > I have uploaded a presentation of high-fidelity network performance measures > which includes an example of bufferbloat in high resolution, as possibly you > have never seen it before. Well, flent can generate a similar level of detail under a generated load. Some of kathie's work can now do it against tcp on pcaps. Was yours against general traffic? > > See slide 18 of this deck: > https://www.slideshare.net/mgeddes/stationarity-is-the-new-speed. The classic > "bloat" is a sudden formation of the queue, and a very slow (and steady) > draining. Bufferbloat is just one form of statistical variability > ("non-stationarity") in packet networks. Good set of slides. Analysis is picking up... Where you and I always tend to fall off a cliff is on your conclusions as to what to do about it, e.g. slide 19. I'd rather love it if you repeated your tests and graphs against pie, and fq_codel, and/or cake. For that matter BBR might be interesting against your tool. And then say what you'd do differently. In some way I can repeat. > For a world record winner, see this one where packets take over a minute (Huawei > WiFi hotspot roaming in Ireland with UK SIM)! Or for a pretty picture of buffers > draining, try this one. Well, at the moment gogo-in-flight holds the interplanetary record (680sec as I recall), but yea, 60+ seconds is up there. Contact Guinness! > > Happy to answer any questions. > > Martin Geddes > > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat