From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dave.taht@gmail.com>
Received: from mail-ig0-x22a.google.com (mail-ig0-x22a.google.com
	[IPv6:2607:f8b0:4001:c05::22a])
	(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 20AF821F20B
	for <bloat@lists.bufferbloat.net>; Mon, 20 Jan 2014 07:48:58 -0800 (PST)
Received: by mail-ig0-f170.google.com with SMTP id m12so11111841iga.1
	for <bloat@lists.bufferbloat.net>; Mon, 20 Jan 2014 07:46:25 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
	h=mime-version:date:message-id:subject:from:to:content-type
	:content-transfer-encoding;
	bh=cznKqYoKuINtgBiSzz26Sc77kgRxhMdvoAf3V6F7XDU=;
	b=zpvrOxDhSLf1RlFZOXo4aO6QSDfEFC6R475Hv0d+qVeilaS1oR+SeLPfU2aPm9wGsY
	HbbVoah4WTxtOw4q400bYvLpbM5HuvAWXQ7pfmo4SF9IPQXXQOioOIbgJx0FzIOGM+fr
	gFYtCjVEPUJbi78nNfXhtS1Qxr/tHZjN9cE0e/5IWV/IxJp8Z+cMmrcWrLVhGBMYbC2G
	JA1Nn/VyHomfOz8w28AV6QrMJkPBcyowINUgo8UqrQOIlffK3Lo7CePGHZzu3aRpMwSp
	Htxtkhn7HY/McmPUlGPoNMAchhdH/fI4C4YnxT7uqSXAOkDWY73SrhOj1K2gEkoLDWNx
	G9RA==
MIME-Version: 1.0
X-Received: by 10.50.79.228 with SMTP id m4mr12696290igx.47.1390232785011;
	Mon, 20 Jan 2014 07:46:25 -0800 (PST)
Received: by 10.64.145.67 with HTTP; Mon, 20 Jan 2014 07:46:24 -0800 (PST)
Date: Mon, 20 Jan 2014 10:46:24 -0500
Message-ID: <CAA93jw4K7-cjxcXt+PWqXe5BMp+Fe8LL=RqyZqhLnL=ASViyLg@mail.gmail.com>
From: Dave Taht <dave.taht@gmail.com>
To: bloat <bloat@lists.bufferbloat.net>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Subject: [Bloat] pie aqm finally landed in Linux
X-BeenThere: bloat@lists.bufferbloat.net
X-Mailman-Version: 2.1.13
Precedence: list
List-Id: General list for discussing Bufferbloat <bloat.lists.bufferbloat.net>
List-Unsubscribe: <https://lists.bufferbloat.net/options/bloat>,
	<mailto:bloat-request@lists.bufferbloat.net?subject=unsubscribe>
List-Archive: <https://lists.bufferbloat.net/pipermail/bloat>
List-Post: <mailto:bloat@lists.bufferbloat.net>
List-Help: <mailto:bloat-request@lists.bufferbloat.net?subject=help>
List-Subscribe: <https://lists.bufferbloat.net/listinfo/bloat>,
	<mailto:bloat-request@lists.bufferbloat.net?subject=subscribe>
X-List-Received-Date: Mon, 20 Jan 2014 15:49:19 -0000

http://www.spinics.net/lists/netdev/msg264935.html

Hat off to vijay and the pie folk at cisco who shepherded the code
through 5 releases to get it upstream!

PIE is now mandated in DOCSIS3.1 cablemodems and the ECO for DOCSIS
3.0 went out a while ago.

I think the mandate differs from the Linux implementation. I don't
know the size of the recomended cablelabs target nor the size of the
estimation window (?)).

So that will improve going-upstream buffering problems dramatically.

The linux implementation supports ECN, the DOCSIS standard does not.
The ECN work in pie has some minor problems that fq_codel doesn't
have, we hope to discuss at ietf...

I will fold the v5 implementation of pie into cerowrt in the next release a=
nd
see what happens.

NOW:

The biggest problem remaining in cable is fixing excessive downstream
buffering. Surely something can be done to remove the 1.6 seconds of
buffering I observed yesterday (at some level without needing to AQM?
Some workaround that operators can use?). Some benchmarks I ran last
night (not against pie):

http://snapon.lab.bufferbloat.net/~d/bev/comcast_native_ipv6/

I sure hope the gpon, lte, and wifi folk are paying attention.

--=20
Dave T=E4ht

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.=
html