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

Jonathan Morton <chromatix99@gmail.com> Fri, 09 August 2019 23:29 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Sat, 10 Aug 2019 02:29:17 +0300
Cc: "Scaglione, Giuseppe" <giuseppe.scaglione@hpe.com>, "rgrimes@freebsd.org" <rgrimes@freebsd.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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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> <C9E9A1C7-59CF-4414-82CE-14ABFE74ADB2@gmail.com> <ADCEE0A5-6A32-4106-8557-029C65B2D4C5@cablelabs.com> <AT5PR8401MB07074B665CF7612FAD66E13899D60@AT5PR8401MB0707.NAMPRD84.PROD.OUTLOOK.COM> <6D40C855-EE12-4148-9EE6-E67DE8ADC715@cablelabs.com>
To: Greg White <g.white@CableLabs.com>
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Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft
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> On 10 Aug, 2019, at 12:54 am, Greg White <g.white@CableLabs.com> wrote:
> 
> Agreed.  I would not expect any different result either, which begs the question why does SCE need two different signals (ECT(1) and CE) in a datacenter environment?

Simple: to allow using the same protocol *outside* the datacentre, because it coexists cleanly with existing RFC-3168 infrastructure and endpoints.  That was always the chief failing of DCTCP.

 - Jonathan Morton

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