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

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

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Fri, 09 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>
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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>
To: "Scaglione, Giuseppe" <giuseppe.scaglione@hpe.com>
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Subject: Re: [tsvwg] Switch testing at 25G with ECN --SCE Draft
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> 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

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