From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x235.google.com (mail-wm0-x235.google.com [IPv6:2a00:1450:400c:c09::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 1D2E43BA8E for ; Thu, 5 Jul 2018 13:26:13 -0400 (EDT) Received: by mail-wm0-x235.google.com with SMTP id 69-v6so12023744wmf.3 for ; Thu, 05 Jul 2018 10:26:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heistp.net; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=qKJDgc/jUPZiajxcfc1li0Np71eaVupxmxXes/OXmqI=; b=N873yXFnpymKGTJ1osPBZlTpLTAfYVLN/fMRs99sy+yaeNtbCMA9riiMfTV61epKDa gFFZub1Ye341AHEOEfRS6L2nLogg43aU/SNyGSHADvJzwPBe6NypGzl6ddBqHk+P6hHg Ijd7H8H188AmpA7RXM+ylvjluP/N3SCx+kDg8n+fphSDkriRGIlUb6lN0irthK+L84fY psJEMO2V6oWJkwUIPC9Sgecno6+uS4posjRBR4CUoeskfkdxGTPlTOcNsb+hR7tI9lET 9lxFuiB1vWkiX4TI2+f3PtztBGbG7udOTLkxNvESmRzllMmjo3XViU5nbmyD3XBdSLsO yfXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=qKJDgc/jUPZiajxcfc1li0Np71eaVupxmxXes/OXmqI=; b=FgRcwN8rEQEWwoYUzMV2gU3Oq8nfxy5/CX+hh9k9+kcYLWqtzyDfnLwey2b2ULI2v6 HY433adja4sjWotDT5h8/t9JKNN6OUtsaxEgpiqryxQ4LdEx9vh7/oAJdVvYO9N21KTI vzRkYwU7rx4BINOTVH5l5ye5nonBmodO6Nh/nb10ewzHk2iHYw71pT7FIfk3jNrp8mRJ sYQ+pku2fQ0rb/md1o4nbuSHMY1J4G5dvgtNm8KnHSgramN1pFbEOMFvQPQv29Utg/lw 7RwiF23JnkN1e8UpqaAbdI4z5BnbykeKOwbBW++7N3HnSeyBs8zwOeg57Hp2+Bf//N5j isOg== X-Gm-Message-State: APt69E04Yhq2cXqMRlOCWLNWqgn/0VrGVOteKpHk40oV2YhZ+/r9p98v T+v8x2LOJo8nLiMSwVc2U6TmKg== X-Google-Smtp-Source: AAOMgpdS8rHhs9dhOKkO9ynFZU7OxH9CjciKbgA0BDMGHiQoocMJKbvTSd3cvAgJEoOGckGcz3KtzQ== X-Received: by 2002:a1c:98a:: with SMTP id 132-v6mr4764340wmj.86.1530811572217; Thu, 05 Jul 2018 10:26:12 -0700 (PDT) Received: from tron.luk.heistp.net (h-1169.lbcfree.net. [185.193.85.130]) by smtp.gmail.com with ESMTPSA id l6-v6sm4617607wmh.41.2018.07.05.10.26.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 05 Jul 2018 10:26:11 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.4 \(3445.8.2\)) From: Pete Heist In-Reply-To: <874lhdeso1.fsf@toke.dk> Date: Thu, 5 Jul 2018 19:26:10 +0200 Cc: bkil , Make-Wifi-fast Content-Transfer-Encoding: quoted-printable Message-Id: References: <9E7E043B-2373-46ED-B122-38A287422999@eventide.io> <87d0wu7rbg.fsf@toke.dk> <8A44F1D4-1EB8-4D46-85F9-00C7307FF2D4@heistp.net> <2EC1279B-76C6-48C0-AED4-E9C4A7D0F004@heistp.net> <874lhdeso1.fsf@toke.dk> To: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Mailer: Apple Mail (2.3445.8.2) Subject: Re: [Make-wifi-fast] mesh deployment with ath9k driver changes X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Jul 2018 17:26:13 -0000 > On Jul 5, 2018, at 3:08 PM, Toke H=C3=B8iland-J=C3=B8rgensen = wrote: >=20 > Pete Heist writes: >=20 >> And in the aqm driver support I=E2=80=99m not sure what fq_overmemory >> signifies (Toke may know that) or if the other stats are within the >> expected ranges for this amount of traffic. >=20 > Overmemory is the amount of times the total queue size went over the > 4MiB limit. So I'd say that 60 million times is...quite a lot. Is = there > a lot of traffic that doesn't respond to congestion signals on that > link? Wow, ok. Well, I suspect it=E2=80=99s p2p. I watched some tcpdumps this = morning of traffic with non-zero DSCP values and saw quite a lot of UDP = packets with these higher DSCP values, which may be aggressive and not = respond much to drops. It=E2=80=99s not always easy to classify that = traffic to do something about it, but I could try. About 20% of overall = traffic is UDP. In response to seeing more traffic in the VO queues, this morning at = around 10:30a I actually disabled the rate limiting (so I=E2=80=99m only = testing one change at a time) and started zero-ing out DSCP values on = all our access points, as well as our main router, with this: "iptables = -t mangle -I PREROUTING -j DSCP --set-dscp 0=E2=80=9D I=E2=80=99m not holding my breath until I=E2=80=99ve seen a couple = nights of data, but ping times have been lower since I made that change = (https://www.drhleny.cz/smokeping/, and note that you may need to empty = your cache if you=E2=80=99ve viewed this page before, so make sure = you=E2=80=99re seeing the latest data). This may not be a long-term solution, but it=E2=80=99s a test. I know = doesn=E2=80=99t prevent people from sending packets to the AP with = non-zero DSCP values, so they can still use the VO or other queues going = to the APs (I can=E2=80=99t zero those values until the packets are out = of the driver as far as I know), but at least traffic coming back from = the Internet uses BE when it goes back to devices. I=E2=80=99ve seen in = my point-to-point testing how lots of traffic in VO can destroy = aggregate throughput.=