IETF Logo Mail Archive

Re: [tcpm] A possible simplification for AccECN servers

Neal Cardwell <ncardwell@google.com> Mon, 25 November 2019 15:21 UTC

Return-Path: <ncardwell@google.com>
X-Original-To: tcpm@ietfa.amsl.com
Delivered-To: tcpm@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 28326120105 for <tcpm@ietfa.amsl.com>; Mon, 25 Nov 2019 07:21:46 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -17.501
X-Spam-Level:
X-Spam-Status: No, score=-17.501 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P9qRmsvqng-M for <tcpm@ietfa.amsl.com>; Mon, 25 Nov 2019 07:21:45 -0800 (PST)
Received: from mail-oi1-x22b.google.com (mail-oi1-x22b.google.com [IPv6:2607:f8b0:4864:20::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 016981200B3 for <tcpm@ietf.org>; Mon, 25 Nov 2019 07:21:45 -0800 (PST)
Received: by mail-oi1-x22b.google.com with SMTP id s71so13374885oih.11 for <tcpm@ietf.org>; Mon, 25 Nov 2019 07:21:44 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=PKQF+n5e4nF4/0ZCYcSCYeMj6Bk1EJchtyvU4klILJs=; b=Mge4I1DuV/bIE0AI7bTjdrinG1tijbA2zNr4n7lccsqqfiu0LLa5luAtdc9mS6Rr/2 5RntcL+479+47V6iHZDrcovBFNYc9RPcKebS7Lr9jqlA8XI4787xr46HShn6TAIBzyhL 9MxWeo1Sj3RE3nz0xxJGFFleUxN29foCDn0CidDVT9VOw3HmtzoR7hcb3Zzk6z/A5krl EzuSqq7Wz0Ya/RV0ztNxzV+rmzuNf1Fn6174RW6tFpDnYILO3aTQR3ZNr3VSoxrCZbck e0EifPka7WQ1PEllbp2ACRavG4tHBp5gH1ugEhJZOYHsCPORMV04qV2p0ilIt8+vbSVi m4QA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=PKQF+n5e4nF4/0ZCYcSCYeMj6Bk1EJchtyvU4klILJs=; b=Ax1xNYwlAbjURxE65tMl797TLgeNgwroGplBNweG2C8z/lnsE66FwQwOEBe63iR4sM jMkggfTJr/bQ0lOWu/+3Rd/Nml39nQCKzXkvHnvdsbQUWLY0RQZisi3q/TxDUk8iaav/ 5jlz0RmmS1HShR7UEEG2E9fP7zqnXAXNdubx1W/NE27BcePVBErfiTOn3AP7Cb/M+/XZ D4QzDeZSRT2jqWDIpcWv9hlYVT+BS3EHArHAk8OpJUdKQCnCtFqrgrLJfmgpX1dAFtmM rGAkax2ba/k+5GADMDwyUvICW54+UYQagOFA91/0DDXtmNwBnqDs7PwtfoKD/vA7Z9sH I3fA==
X-Gm-Message-State: APjAAAXpoKNdx+GZi/WF7K0GL4yWuJ5v6xunj+3fFMOHe2zUpf6fszwT OsPBAKmmKdEoIZyhB0LwXZ4MZOpAMCznxU6fXbh6Dg==
X-Google-Smtp-Source: APXvYqxQUFOo5yWIZYwKJS2AkFeOLqaBj3MpN1ItOiynQlDNJXxZX8hNgou3c1vYQnxXS1ohCIl0B/tHuI/1OTjkYqo=
X-Received: by 2002:aca:3889:: with SMTP id f131mr23268346oia.14.1574695303737; Mon, 25 Nov 2019 07:21:43 -0800 (PST)
MIME-Version: 1.0
References: <d35618ee-c0dc-44ee-9e22-50bdabbe026c@bobbriscoe.net> <CAJq5cE0c7TPMVD9PR9h0Q3t_p5Bg=OzGda-phZD4K3gDGJ7Rbw@mail.gmail.com> <trinity-7ba1d8a6-ec0e-408d-9268-3f1fbbc7c8d5-1574520198350@msvc-mesg-gmx023> <9D63E04D-73F0-4CF0-9357-3ACEF67FCA0F@gmail.com>
In-Reply-To: <9D63E04D-73F0-4CF0-9357-3ACEF67FCA0F@gmail.com>
From: Neal Cardwell <ncardwell@google.com>
Date: Mon, 25 Nov 2019 10:21:27 -0500
Message-ID: <CADVnQymnSOmp4zhcirJ1RqotbUM7_aj49n=Jk_KXrW5Cgppk7g@mail.gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Richard Scheffenegger <rscheff@gmx.at>, tcpm IETF list <tcpm@ietf.org>, Mirja Kuehlewind <ietf@kuehlewind.net>
Content-Type: text/plain; charset="UTF-8"
Archived-At: <https://mailarchive.ietf.org/arch/msg/tcpm/3OMDNJqkEk3Z2-cfP42PqhvHGgY>
Subject: Re: [tcpm] A possible simplification for AccECN servers
X-BeenThere: tcpm@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: TCP Maintenance and Minor Extensions Working Group <tcpm.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tcpm>, <mailto:tcpm-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tcpm/>
List-Post: <mailto:tcpm@ietf.org>
List-Help: <mailto:tcpm-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tcpm>, <mailto:tcpm-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 25 Nov 2019 15:21:46 -0000

On Sun, Nov 24, 2019 at 12:21 AM Jonathan Morton <chromatix99@gmail.com> wrote:
> I should point out here that datacentres are a special case - a contained
> environment in which it is permissible to bend certain rules for the sake
> of performance, in ways that would not be acceptable for Internet traffic.
> I think this is one of these cases, like DCTCP itself.

IMHO it is worth emphasizing that much of the traffic that travels
over the public Internet is sent by servers that are situated in
datacenter networks where the datacenter switches are CE-marking using
shallow-threshold DCTCP-style ECN. So that "datacenter traffic" and
"public Internet traffic" are, in some sense, overlapping categories,
rather than disjoint categories.

neal

v2.23.0 | Report a Bug | By Email