From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pj1-x1034.google.com (mail-pj1-x1034.google.com [IPv6:2607:f8b0:4864:20::1034]) (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 601BD3CB35 for ; Tue, 29 Jun 2021 15:48:35 -0400 (EDT) Received: by mail-pj1-x1034.google.com with SMTP id b5-20020a17090a9905b029016fc06f6c5bso3174614pjp.5 for ; Tue, 29 Jun 2021 12:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3MA7xMtu71LLLaliW6mfDhwnX7vN68cuxQS5oqkWFAs=; b=WdXhKSlvh4myxeH5NzVBekwbEZ2Fpr1rvP5I2hBD74rVVaLe4WankrO0DgvBkV1aPz kWJgfI+MhLEju5D0S80FcC0xtKeMW976mK91Rvlr6OTEQgba1kRigEAH1XWlexeRLWkA R7/DFYWxXHivJdCNYwQ0I/vqcbYSugTfXRJwmEZDS/jslZbwN5SDuVyDn3l8NuS0GBrt Fn72/9bqjYKCUrliJugwp944TtMQaF4WENDL38rsZbIWJkROmy/2RTHxwAo0HG4n9aV1 uQhkV15ZD/HUzlnaQcTON9z10etaR1Fgzouv+cuCWGAqwYrdBlImSmbfxanQZU5FS2H1 VF+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3MA7xMtu71LLLaliW6mfDhwnX7vN68cuxQS5oqkWFAs=; b=TUFySn0jP+I+XXudAFN1sZREj7IevIRImnnkIpNtVWBZHA6Tfo/ZI6bvH3trHs97YA fGIAEBV36e8r4O8Nosmxw6qAV+OvOEB5lhbBrHrmpWZQQmgZ7M5lSh9RQxVbckuacjjM E6Pbrdkl1k3odq4X8I20UOrk3t/BobFm18zyPoiOzU4fktCGG4IH5RM5wuwe5vNIwCp+ QnyEt+SFCqhAbGGmTOeWzIjX0y1CFh85odFtzwQKjYJkHsh6EZ18LmvnTVCrG1oJxD8f a7Ol419MnPZegL+BsLfDvHkDIoloRHF/jr8V6JWDgeJAMVXVE/HT9CPKwq98wflBWDjs e2Kw== X-Gm-Message-State: AOAM5303Egm+vZRR1q8lhufWyGOytXNGY0j9LzdNWsRcsNVn+n5ru9qw 3+nCthcCBgolTEE4sm8WnrjtdA== X-Google-Smtp-Source: ABdhPJwQrllItqK5Z0oYi8H0RPwKZrHn+DscCBbOlhAVdcwqt4tumvFR/6EV5gs09pKID8858Xj0fA== X-Received: by 2002:a17:90a:4295:: with SMTP id p21mr11832180pjg.149.1624996114299; Tue, 29 Jun 2021 12:48:34 -0700 (PDT) Received: from hermes.local (204-195-33-123.wavecable.com. [204.195.33.123]) by smtp.gmail.com with ESMTPSA id 136sm19633886pge.75.2021.06.29.12.48.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Jun 2021 12:48:34 -0700 (PDT) Date: Tue, 29 Jun 2021 12:48:31 -0700 From: Stephen Hemminger To: "Livingood, Jason" Cc: "bloat@lists.bufferbloat.net" Message-ID: <20210629124831.6de2c1b9@hermes.local> In-Reply-To: References: <20210621210048.628befdb@hermes.local> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Bloat] Really getting 1G out of ISP? 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: Tue, 29 Jun 2021 19:48:35 -0000 On Tue, 22 Jun 2021 22:51:18 +0000 "Livingood, Jason" wrote: > > It doesn't help that all the local ISP's claim 10Mbit upload even with 1G download. Is this a head end provisioning problem or related to Docsis 3.0 (or later) modems? > > I'll cover this in an upcoming technical paper (mid-July I hope). Depending on the DOCSIS version, CMTS, and cable modems involved you may have no AQM, or buffer controls for the cable modem, or AQM (sort of) on the CMTS and in the cable modem. In the Comcast network you should find AQM in the upstream queue on the cable modems for which we have deployed RDK-B software (XB6 and XB7), while other devices would have buffer controls. > > JL > Just a short update. The cable modem matters. Updated from Docsis 3.0 modem with bad Intel Puma chipset to new model with Docsis 3.1 and Broadcom and things are much more stable. As far as AQM, in this setup; fq_codel does much better than the Cake configuration. With fq_codel can see 700Mbit download speed. It looks like Cake is using more CPU especialy since the Cake configuration is using an ifb ingress queue discipline as well.