From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) (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 C7FBB3B29E for ; Tue, 16 Mar 2021 18:14:17 -0400 (EDT) Received: by mail-lf1-x136.google.com with SMTP id q25so64824323lfc.8 for ; Tue, 16 Mar 2021 15:14:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=qFNzyG8Y10OUBn+xJGJaTbxbWKgL0gCRqK6eavIXAQQ=; b=P7xYdR4RhM536Sf6w1imlJqKOKT6aU6Qz1t/CLT7+StXnGNKdGtVQLKe0Hx/1CZFkd ucwyzQ7Bbtbvn5Wj4SXfAn2avR6Hp0sIQMRvpgOGaq5jg2XHBFMFQIP0b5AqF/78Muei Neb8nzB5mNVPThL5ZkIf99lbbSkkP0RaW0mk7Eu/O1WYBfgvoOrWiHWlLLTR+PTr4ZG2 BDODp9iDMm9PVE0shTL5rhpC0AJa5JyFwYR8R6s3+gFBNEh7ogIoiycpbGU+3FEC2/IZ 6Dq7uy8eTxMFSDKTlZaJwWrCMW3QMa36stWMlouvQOvIRR4wuNTxtsxq2PDAMKdPzikd LoDA== 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=qFNzyG8Y10OUBn+xJGJaTbxbWKgL0gCRqK6eavIXAQQ=; b=jNdfwxenK0tqLy1QdLtq2wgfxsx3+1tB7uC+tMP1Xg1iYRe3eVGxQbPowMaIy76fav hsNpkqI58GAVxT21fPqAnB5YspZDJNqrfmyQBB5gkroG314D+TdM2b1Ah0dzPoO0invi 17gdXjOVrZDDpxCrZsK0LP3yeDnhMTcIlnkBp4nBJ4OkJDFD8hTQhzomSV4AEdh5hIs8 WwwLPYRDojITrpEO/sNCaMAzw/Ex8UmFiRKoW/E4U3enm5A0ODwtibsGuYgyhdCc39r7 S96FAkgnGD3GigfgMAJaTv2epwnpgiK4+NOI0rVyUeHmYv6zAwfwafZ2RCsvTUMjZrDJ 2AXQ== X-Gm-Message-State: AOAM532zKteym0ZTiOsAWxXefAWpq4BL6DTUMSkR0q/dSImofp3b2Qe+ uf//tNPmuCR9Pa8LqO3YXIs= X-Google-Smtp-Source: ABdhPJwQMm3GRAPXQYiMGeBw5ATY9VNTwE8xp1fG1mbsKV+/fkr/YlibzNy3CzzY2zkMCxNLyEkgFA== X-Received: by 2002:a19:f001:: with SMTP id p1mr506919lfc.447.1615932856545; Tue, 16 Mar 2021 15:14:16 -0700 (PDT) Received: from jonathartonsmbp.lan (87-93-215-52.bb.dnainternet.fi. [87.93.215.52]) by smtp.gmail.com with ESMTPSA id s22sm3302904ljd.28.2021.03.16.15.14.15 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Mar 2021 15:14:16 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.7\)) From: Jonathan Morton In-Reply-To: Date: Wed, 17 Mar 2021 00:14:14 +0200 Cc: Charles Rothschild , "cerowrt-devel@lists.bufferbloat.net" Content-Transfer-Encoding: quoted-printable Message-Id: <4A515BE9-AEE5-40D1-AEC6-2B0C3BCBA142@gmail.com> References: <1287379027.1155590.1615919208363.ref@mail.yahoo.com> <97BB05AF-95BB-4F0A-A6DF-4CF40686F782@gmail.com> To: Dave Taht X-Mailer: Apple Mail (2.3445.9.7) Subject: Re: [Cerowrt-devel] Looking for MORE SQM Router Recommendations ! X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Mar 2021 22:14:18 -0000 > On 17 Mar, 2021, at 12:04 am, Dave Taht wrote: >=20 > Is that based on measurements? Yes, Pete did some. > I did not care for the pi3's behavior much. Unlike the Pi 3, the Pi 4 has a true GigE MAC built into the SoC, and = the USB3 controller has enough throughput to actually support a second = GigE port; it's attached to a real PCIe lane. This means it can move = packets from one to the other, in both directions at once, at wire speed = without relying on an offload engine (which it doesn't have). That's = perfect for SQM. In older Pis, the Ethernet port was attached over USB2. That doesn't = have enough throughput to support GigE, and most models had a 100base-TX = port as a consequence. There's a similar bottleneck in most CPE routers = between the CPU and the Ethernet hardware complex, with the offload = engine being part of the latter. That bottleneck is why SQM can't reach = wire speed on that class of hardware. - Jonathan Morton=