From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-x22e.google.com (mail-qk0-x22e.google.com [IPv6:2607:f8b0:400d:c09::22e]) (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 76B973B2A4 for ; Thu, 7 Jul 2016 13:57:48 -0400 (EDT) Received: by mail-qk0-x22e.google.com with SMTP id t127so21102291qkf.1 for ; Thu, 07 Jul 2016 10:57:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=pdLNCftkcrohW4PHwjD9XYjfIPeU/CyVQW+sbRSV7NI=; b=vd+JePibrkpsS+yHBrsw/CeMJfvMj7/I41ZQi6iRLOrhL0SCcKFVrEJtMqZlpR6qxp oPtXbD1XxSILrBreAuYJ2uzo5E+UROSMY7Izmro2Cip/JkPIINJd4sEPtJzCyy3IDrJg LCWZV2vj98LrQNfjoY32rzlmXx8MPTiPgQ1yOMI4zLxduXWLIMZJ9et9VPXVTFAv0GJh 3w5J2wMvpJV1uTdDd7nFF/PGYysCY1N1bHrijF6d/3IFavjT64F53iODfOhHCGLeI769 dHpWXEnJm7S9FCla1/Lx8tbF4JZ8cmwDxtBK1x5bayDXR7M0XTZIdWoOTWTfC8jbr1IK Emkg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=pdLNCftkcrohW4PHwjD9XYjfIPeU/CyVQW+sbRSV7NI=; b=U2ExRHjW62dWx70fpKeADdqemqWT3ys32xd6w78rmSJ+QKRs6B/ubWXFvVa1p4YJ0d eXlY+nL4slDvbqIpyd0imycercZEquBW+1wTwwDrTMMJkdo359jIrS8Xg+/ZEb3fNfZv NHhuGF5umBBRjAj3WU297LowsWpuiFXkLRV3s3TJ7LfSxtuUaBT02kagMJ/ah5pfMXK1 nK+ChlWKUoymZXqWO/YKhwpzivTxI2Vf+ww9mR1/CxLBZDhsb6ko5alFLRp3babBB60a FgTwILHfesPloIwzH6c/cWbnwuLM+4hsPC08lPohp18jhRD7qqpw9y13H3tWNS8mfX+h yexg== X-Gm-Message-State: ALyK8tJlzFwyBQ+5gsTRdUXKSL+izsSphoFhkpoAKsdkzwnnVHAF8s+Zn3fDy4GOr9Zx6Q== X-Received: by 10.55.149.3 with SMTP id x3mr1859550qkd.140.1467914267992; Thu, 07 Jul 2016 10:57:47 -0700 (PDT) Received: from [192.168.253.145] (pool-64-222-236-200.port.east.myfairpoint.net. [64.222.236.200]) by smtp.gmail.com with ESMTPSA id o27sm3158952qto.29.2016.07.07.10.57.46 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 07 Jul 2016 10:57:46 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: Rich Brown In-Reply-To: <5B859436-AC4A-44CE-9218-981F9C1855B1@gmx.de> Date: Thu, 7 Jul 2016 13:57:45 -0400 Cc: bloat Content-Transfer-Encoding: quoted-printable Message-Id: <6282F017-157E-4A21-BF96-B6DFCBB88CC7@gmail.com> References: <7174F836-3969-4967-B1B0-AAB34F3DE4AC@gmail.com> <5B859436-AC4A-44CE-9218-981F9C1855B1@gmx.de> To: moeller0 X-Mailer: Apple Mail (2.2104) Subject: Re: [Bloat] Updates on www.bufferbloat.net 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: Thu, 07 Jul 2016 17:57:48 -0000 Hi Sebastian, > On Jul 7, 2016, at 11:55 AM, moeller0 wrote: >=20 > I see that there is a link to = https://wiki.openwrt.org/doc/howto/sqm on this page, and that reminds = me, could you add a link to = https://github.com/moeller0/ATM_overhead_detector to that openwrt page = please? Probably in the section titled =E2=80=9CLink Layer Adaptation - = the details=E2=80=A6=E2=80=9D > Here is a quick draft: >=20 > For true ATM links one often can measure the real per packet overhead = empirically, see https://github.com/moeller0/ATM_overhead_detector for = further information how to do that. >=20 > And while at it the following might also need a small upgrade: > original: =E2=80=9CSQM can also account for the overhead imposed by = "Ethernet with overhead" (mostly VDSL) links. Cable Modem, Fiber, and = direct Ethernet connections generally do not need any kind of link layer = adaptation." >=20 > proposal: "SQM can also account for the overhead imposed by "Ethernet = with overhead" (mostly VDSL) links. Cable Modems (docsis) are known to = typically use 28 Byte of overhead in the upstream direction but only 14 = in the downstream direction. If your version of SQM only supports to = specify one value for the overhead, select 28 Bytes=E2=80=A6 Fiber, and = direct Ethernet connections generally do not need any kind of link layer = adaptation.=E2=80=9D >=20 > Thanks to Greg we learned something about docsis and it would be = a pity not to pass this information on to our users=E2=80=A6 (Note to = self I need to allow independent overhead control for ingress and egress = in sqm-scripts and the GUI). I took a stab at it. Let me know if I got it right: = https://wiki.openwrt.org/doc/howto/sqm#sqmlink_layer_adaptation_tab Thanks. Rich=