Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft

Jonathan Morton <chromatix99@gmail.com> Fri, 09 August 2019 20:58 UTC

Return-Path: <chromatix99@gmail.com>
X-Original-To: tsvwg@ietfa.amsl.com
Delivered-To: tsvwg@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AEC31200FA for <tsvwg@ietfa.amsl.com>; Fri, 9 Aug 2019 13:58:37 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.749
X-Spam-Level:
X-Spam-Status: No, score=-1.749 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.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 87g-JYCmM8W3 for <tsvwg@ietfa.amsl.com>; Fri, 9 Aug 2019 13:58:36 -0700 (PDT)
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 ietfa.amsl.com (Postfix) with ESMTPS id DD5E1120077 for <tsvwg@ietf.org>; Fri, 9 Aug 2019 13:58:35 -0700 (PDT)
Received: by mail-lf1-x136.google.com with SMTP id c9so70394496lfh.4 for <tsvwg@ietf.org>; Fri, 09 Aug 2019 13:58:35 -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=3xhMtzTfBSQprWdvlHwDGtTVljUoPXn/2xRJtxnerAc=; b=fQGzAH5TTWQgzIU8oxt41c8CBIaJW+qohE1ngXV6LR+ud7PJkl+8Kv9XYvetUL8GL4 cWRnViiLaZQaB0I/ZOhoX+SeXRnNWmYNV74KEAUFsAsfJ90WxqgFemeiLgi/pv1GTip3 1vgHkjiP0X0HImM0eP3srObYZBwuB9EBX4R2mfsINdTQbonlGf8RYlSxPOHRDPq/2Wyf LYnIL44u86GYiGg48iZKWeb/koWo3DMFpRaT/PYWa9TCGHuQaRZDHcvTYJYu0o70/yEV LWU6/H+jUjQzFdK5itOgicFHYgIL977r5yFubRCV1nCcZaT8IR/kpXpAuEfk2TMchjDw Owbg==
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=3xhMtzTfBSQprWdvlHwDGtTVljUoPXn/2xRJtxnerAc=; b=iRxtdU/CiKFruVp/r7k+au9RgVQVA5hY/J7rGwWL1uWEeFSh0QruWFPTthY3PHg2RO AdfF2zGnDxBOCeStC0/cFyP4pZqRr8DZWXamOyQ/2xlBKW5md9ibquL02l2abxnuqTk9 BHSr6J0+d1R7j73g6xCGQhG9wwztVpji5K6j5sZMUDBh22k2YgOyt2859x7tJP0Hp9xx mmxdItYga+z9BoldK8z6im/JVWR1a7N6QyAlFY1sgRp0w9sLjoQziwXLc7poNFfiRyXO MyQ845EideTxD6Z+xkW7IIzK5YOwhoQzazJn24HOBqVX4Bo8ROL9933xwX9KtJMdBr1h h3hA==
X-Gm-Message-State: APjAAAXSiFUXNkpAdPvfYY3Z9x6biyvk5kN7Avoq6K1M7TI2jGB1clEX 4Ko/2m+HAwaqAm8sKufdXPo=
X-Google-Smtp-Source: APXvYqyfP5F/IKfe0Pr66UyBAKlalSTSj434pdBe+pxq39s/TZ+br8O4zNwZDiD0OJofKHXHTSwpVw==
X-Received: by 2002:a19:c511:: with SMTP id w17mr3343920lfe.31.1565384314105; Fri, 09 Aug 2019 13:58:34 -0700 (PDT)
Received: from jonathartonsmbp.lan (83-245-237-193-nat-p.elisa-mobile.fi. [83.245.237.193]) by smtp.gmail.com with ESMTPSA id e87sm22644512ljf.54.2019.08.09.13.58.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Aug 2019 13:58:33 -0700 (PDT)
Content-Type: text/plain; charset=us-ascii
Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\))
From: Jonathan Morton <chromatix99@gmail.com>
In-Reply-To: <AT5PR8401MB070700703FBF2318808238CF99D60@AT5PR8401MB0707.NAMPRD84.PROD.OUTLOOK.COM>
Date: Fri, 9 Aug 2019 23:58:32 +0300
Cc: Greg White <g.white@CableLabs.com>, "rgrimes@freebsd.org" <rgrimes@freebsd.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
Content-Transfer-Encoding: quoted-printable
Message-Id: <C9E9A1C7-59CF-4414-82CE-14ABFE74ADB2@gmail.com>
References: <A8E3F5E9-443D-4F5A-9336-9A0E2E72C278@cablelabs.com> <201908082333.x78NXS0T094756@gndrsh.dnsmgr.net> <AT5PR8401MB07070C672C9F519C05D2D3F599D60@AT5PR8401MB0707.NAMPRD84.PROD.OUTLOOK.COM> <81354E22-777C-4BDB-96E0-0B1F6C1DCCD2@cablelabs.com> <AT5PR8401MB070700703FBF2318808238CF99D60@AT5PR8401MB0707.NAMPRD84.PROD.OUTLOOK.COM>
To: "Scaglione, Giuseppe" <giuseppe.scaglione@hpe.com>
X-Mailer: Apple Mail (2.3445.9.1)
Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/NVQ49IJ79Eb__CtDravzxaJFkC4>
Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft
X-BeenThere: tsvwg@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Transport Area Working Group <tsvwg.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tsvwg/>
List-Post: <mailto:tsvwg@ietf.org>
List-Help: <mailto:tsvwg-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tsvwg>, <mailto:tsvwg-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 09 Aug 2019 20:58:38 -0000

> On 9 Aug, 2019, at 11:44 pm, Scaglione, Giuseppe <giuseppe.scaglione@hpe.com> wrote:
> 
>>> Just to be super clear, this isn't a hardware implementation of SCE running at 25Gbps.
> 
> I am not sure I follow. The Test setup section of the paper clearly describes the hardware used -- severs, switch, cables. 
> What I cannot disclose at this point is the exact model and characteristics of the HPE Aruba Switch used. Yet, it is a "real" Ethernet Switch, providing 25Gbps connectivity, configured to do bridging across the four ports and implementing RFC3168 with the ECN remarking configuration described in my previous email and on the paper.

I think the issue is with the way the switch itself marks with CE, not ECT(1).  It's a limitation I think is worth acknowledging and, hopefully, finding a way to remove.

 - Jonathan Morton