From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-xe35.google.com (mail-vs1-xe35.google.com [IPv6:2607:f8b0:4864:20::e35]) (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 1885D3B2A4 for ; Sat, 31 Jul 2021 18:56:11 -0400 (EDT) Received: by mail-vs1-xe35.google.com with SMTP id bg4so7523844vsb.6 for ; Sat, 31 Jul 2021 15:56:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=2W0U0gLlLdjP/jeetWyYpzabECjVl9FjBx3i4R0r/rE=; b=WYvbECfQ5/vtlbB8/JxsXVPPUxmJvPUm3DAkE1ON9lKVn1cEV+WMDpM+NUXvkisWz8 hWOmBd4yjx8MIRNFKW4MADZFflODjgzH2BZuv0hL3kdaNvSiFTfqQ5wYDkxqMOHoH7Nk ysSJsa6BwuFRazhisxSQL5Cy2RvOuujsp8yMj+gD7EbGFHtU1HczteSXTUYKvJc3pE1S TFmucHeMBfOkZHdZokVb6IbPoR8rHSax9w85ktfgIInyfeM64LU4Z+71Gp31AoXtFreO iHdVbnVJoQbAPOPDbg2PaX15PulctkwQRHJWFGQXgZUwI7i49A0lLje/i361LFnEyLjU pxoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=2W0U0gLlLdjP/jeetWyYpzabECjVl9FjBx3i4R0r/rE=; b=mRkYL+AhxEQoKVZ2YGVzty+7cCd/FGMn90tMr/AD+Snqi8ED59J2OnPPfQePZOMCqP YtaOuZHTAo8GedLr5alA5awj2S9rEZLa4L0tSGEJ9qlVEbLRvVIekOib9vUApLe/wAwK Rrkdj24y7bdLofMFCBwce4lnavru/X7nh+2T9kioOKfeigO37pYeT6CCXmA3NPaC5cgK Bp+T+YeBCPxP0+eXgQdvMsb5gfmZ78KJqbT74TS2jLVxSPIPHeny3omrShywZQ7b/3ay An1/wcx9SzMH8BaSHwUSg3b2gsYHO8cYjBZgb2akdF9INDDXUoQzXgNwh/I2yqiNHpTk /ZFQ== X-Gm-Message-State: AOAM531nIF1rIidj79VhK/K7W3hRhn/6N2u1nNQfdPWnuHkH34f8kLBr a7tDTDQXOXT2NL+8YaPWejKyvCe0xyfZP7nLFF71Lg== X-Google-Smtp-Source: ABdhPJzpGyTy1os3PT1DUkAb/GdliqZrr7570OG+aUBxk9VJRevWDcyr0E6hHAzI9UBYj7FpQzc26MwYruI6/E4MsZI= X-Received: by 2002:a67:2442:: with SMTP id k63mr6705901vsk.16.1627772170368; Sat, 31 Jul 2021 15:56:10 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Neal Cardwell Date: Sat, 31 Jul 2021 18:55:53 -0400 Message-ID: To: Aaron Wood Cc: Simon Barber , "starlink@lists.bufferbloat.net" , bloat Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Starlink] [Bloat] Of interest: Comcast AQM Paper X-BeenThere: starlink@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Starlink has bufferbloat. Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Jul 2021 22:56:11 -0000 On Sat, Jul 31, 2021 at 3:27 PM Aaron Wood wrote: > > If we see that AQM appears to be not functioning as expected > for upstream connections on DOCSIS3.1, what's the right avenue > for getting that resolved? (and does that only apply to the > Comcast-owned, vs. customer-owned, modems?) FWIW, from the paper it sounds like not all Comcast cable modems had/have PIE, which enabled the A/B experiment: "10. Latency Measurement Results As explained earlier, for two variants of XB6 cable modem gateway, upstream DOCSIS-PIE AQM was enabled on the CGM4140COM (experiment) variant but was not available on the TG3482G (control) variant during the measurement period. The TG3482G variant used a buffer control configuration that predated AQM in DOCSIS." neal > > On Sat, Jul 31, 2021 at 10:50 AM Simon Barber wrot= e: >> >> Awesome to hear that you are turning this on both upstream and downstrea= m. Do you know if the wifi stacks in your home routers also have AQM? >> >> Simon >> >> >> > On Jul 30, 2021, at 10:28 PM, Livingood, Jason via Bloat wrote: >> > >> > FYI that I will be presenting a lightning talk at the IRTF MAPRG meeti= ng today at 17:30 ET (https://datatracker.ietf.org/meeting/111/materials/ag= enda-111-maprg). The talk links to a just-published paper at https://arxiv.= org/abs/2107.13968 (click PDF link in upper right of page) that will likely= be of interest to these two lists. >> > >> > High-level: turning on AQM in the cable modem (upstream queue) took wo= rking latency from around 250 ms to between 15-30 ms, which is actually kin= d of cool. ;-) AQM is turned on in all of our CMTSes (downstream queue) and= in DOCSIS 3.1 modems (upstream queue). >> > >> > Have a nice weekend, >> > Jason >> > >> > _______________________________________________ >> > Bloat mailing list >> > Bloat@lists.bufferbloat.net >> > https://lists.bufferbloat.net/listinfo/bloat >> >> _______________________________________________ >> Bloat mailing list >> Bloat@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/bloat > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat