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Re: [tsvwg] L4S and the detection of RFC3168 AQMs

"Black, David" <David.Black@dell.com> Fri, 11 December 2020 23:03 UTC

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From: "Black, David" <David.Black@dell.com>
To: Martin Duke <martin.h.duke@gmail.com>, "C. M. Heard" <heard@pobox.com>
CC: TSVWG <tsvwg@ietf.org>, "Black, David" <David.Black@dell.com>
Thread-Topic: [tsvwg] L4S and the detection of RFC3168 AQMs
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Date: Fri, 11 Dec 2020 23:03:41 +0000
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References: <125328289.3455959.1607381048136.ref@mail.yahoo.com> <125328289.3455959.1607381048136@mail.yahoo.com> <3F562A25-F4F2-4335-9ED7-54299500B8F6@cablelabs.com> <a35cf206-2fc7-c60e-c713-c4f916106bde@bobbriscoe.net> <CAM4esxQQe4MJsU3ZvdVWVeSC6z+YWCytDd3i2im27qhnss1_og@mail.gmail.com> <CACL_3VE_FD7wdwXGgbYsBnj0+ox-m6s6V=uZVaVZdgK-fLT2KQ@mail.gmail.com> <CAM4esxT1SjveX3AKbOcfjD317ojTNsxfgk84OAQ7=6v-YjQDow@mail.gmail.com>
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Subject: Re: [tsvwg] L4S and the detection of RFC3168 AQMs
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In which case, RFC 8311 Section 4.3 allows experimental usage of ECN with such packets (https://tools.ietf.org/html/rfc8311#section-4.3).

Thanks, --David


[EXTERNAL EMAIL]
My understanding of 3168 is that only in-window data packets are marked ECT(0). A zero-length segment is a equivalent to a pure ACK, which is not marked.

On Fri, Dec 11, 2020 at 12:09 PM C. M. Heard <heard@pobox.com<mailto:heard@pobox.com>> wrote:
On Fri, Dec 11, 2020 at 11:51 AM Martin Duke <martin.h.duke@gmail.com<mailto:martin.h.duke@gmail.com>> wrote:
This falls under the "much easier to do in other transports" category, where I could just send a PING or HEARTBEAT marked ECT(0) to test the queue in mid-connection, without affecting the latency of anything that matters. But in the TCP case, I'm not sure how to resolve Bob's second objection (running ECT(0) for a long time would be unacceptable).

Could zero-length TCP segments be used instead of PING or HEARTBEAT?

Mike Heard

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