From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <chromatix99@gmail.com>
Received: from mail-lb0-x232.google.com (mail-lb0-x232.google.com
	[IPv6:2a00:1450:4010:c04::232])
	(using TLSv1 with cipher RC4-SHA (128/128 bits))
	(Client CN "smtp.gmail.com",
	Issuer "Google Internet Authority G2" (verified OK))
	by huchra.bufferbloat.net (Postfix) with ESMTPS id 8E89F21F394
	for <codel@lists.bufferbloat.net>; Sat, 21 Mar 2015 16:55:16 -0700 (PDT)
Received: by lbbug6 with SMTP id ug6so2726251lbb.3
	for <codel@lists.bufferbloat.net>; Sat, 21 Mar 2015 16:55:13 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
	h=content-type:mime-version:subject:from:in-reply-to:date:cc
	:content-transfer-encoding:message-id:references:to;
	bh=iBozYW9Ev0ITZdmodvat1SiajQ+dDvsQvrWhcNXjt9U=;
	b=BYS+MlNAYi6570srXak1Mm2KNlmQ5bMCnFian1OgEvwDCEOIbANa6uYJPjI4cwGafl
	wxSDwpOW9NzlxaDnW2cQBc4bZhoPpo/ES6HnwGt/MhCI+l/pWuVN6JxVSnlycEZWRu07
	UPAd+mZJx0vwiDArIhhwxWbTr+fz0UtC1ARfxG42av+o4TdNl/tpaDhNZuUCr1obSlq7
	AXZPwkNuzZVaUMmQvPF0Nz6A+uAcUel9VICEMggcLkQCXE5L11yJ1+wiYxRgKgDAqY29
	Tt1cTno/lgE4YA4W8brKeZXRcTRqOtgB/FYOx1/HKwfRsL5l1gfoDepeceNt157RJMQw
	H+AA==
X-Received: by 10.152.6.2 with SMTP id w2mr77364669law.6.1426982113548;
	Sat, 21 Mar 2015 16:55:13 -0700 (PDT)
Received: from bass.home.chromatix.fi (188-67-143-107.bb.dnainternet.fi.
	[188.67.143.107])
	by mx.google.com with ESMTPSA id ko6sm1741600lbb.36.2015.03.21.16.55.11
	(version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128);
	Sat, 21 Mar 2015 16:55:12 -0700 (PDT)
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2070.6\))
From: Jonathan Morton <chromatix99@gmail.com>
In-Reply-To: <CAA93jw4PZ2ARfbeVhoGJTXodu1qy+q11W-Pug3P5OLd=feTzkg@mail.gmail.com>
Date: Sun, 22 Mar 2015 01:55:07 +0200
Content-Transfer-Encoding: quoted-printable
Message-Id: <26F8113F-4FF5-4C78-B397-B65C9CB8221E@gmail.com>
References: <7081A75C-899A-4DB7-8D77-935A37B362D8@gmail.com>
	<5509957B.30600@pollere.com>
	<491C7497-BE3E-452B-A797-C7FC1102E7ED@gmail.com>
	<CAA93jw7JVjvj9QYCLYT+UHOLDPSmdYB4uAp8wf+B=TL9pOrxrA@mail.gmail.com>
	<CAA93jw4PZ2ARfbeVhoGJTXodu1qy+q11W-Pug3P5OLd=feTzkg@mail.gmail.com>
To: Dave Taht <dave.taht@gmail.com>
X-Mailer: Apple Mail (2.2070.6)
Cc: "codel@lists.bufferbloat.net" <codel@lists.bufferbloat.net>
Subject: Re: [Codel] The next slice of cake
X-BeenThere: codel@lists.bufferbloat.net
X-Mailman-Version: 2.1.13
Precedence: list
List-Id: CoDel AQM discussions <codel.lists.bufferbloat.net>
List-Unsubscribe: <https://lists.bufferbloat.net/options/codel>,
	<mailto:codel-request@lists.bufferbloat.net?subject=unsubscribe>
List-Archive: <https://lists.bufferbloat.net/pipermail/codel>
List-Post: <mailto:codel@lists.bufferbloat.net>
List-Help: <mailto:codel-request@lists.bufferbloat.net?subject=help>
List-Subscribe: <https://lists.bufferbloat.net/listinfo/codel>,
	<mailto:codel-request@lists.bufferbloat.net?subject=subscribe>
X-List-Received-Date: Sat, 21 Mar 2015 23:55:45 -0000


> On 21 Mar, 2015, at 18:09, Dave Taht <dave.taht@gmail.com> wrote:
>=20
> I would like cake to have a byte limit instead.

That can probably be arranged.

> at (say) 2 or 4x the BDP

Hmm, we know the bandwidth, but what=E2=80=99s the delay?  It probably =
makes sense to use the Codel interval parameter for that purpose.  Four =
times that should make a reasonable headroom for most situations, and =
the drop-from-longest-queue behaviour should deal with excursions beyond =
that.

> It would be nice for cake (without shaping enabled) to be about to
> automatically sense the actual interface rate and size this outer
> limit appropriately, but I don't think mechanisms exist to do that.

It may be feasible to guess an initial value, and refine it based on the =
observed throughput when the queue is busy.

- Jonathan Morton