Re: [tsvwg] Fwd: New Version Notification for draft-heist-tsvwg-ecn-deployment-observations-00.txt

Bob Briscoe <> Fri, 19 February 2021 21:36 UTC

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To: Jonathan Morton <>
Cc: Pete Heist <>, TSVWG <>
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From: Bob Briscoe <>
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Date: Fri, 19 Feb 2021 21:36:36 +0000
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Subject: Re: [tsvwg] Fwd: New Version Notification for draft-heist-tsvwg-ecn-deployment-observations-00.txt
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On 19/02/2021 13:34, Jonathan Morton wrote:
>> On 19 Feb, 2021, at 2:50 pm, Bob Briscoe <> wrote:
>> Given you have close contact with this ISP, have you asked, or could you ask them whether they have ever deployed any FIFO ECN-enabled AQMs themselves?
> As far as I'm aware, they have only used fq_codel for ECN.  Before that, they were using SFQ in some places, without any AQM.

[BB] So do you suspect that any of the CE-marking in traffic not 
traversing their backhaul FQ-CoDel boxes is from a FIFO ECN-enabled AQM?

Or is this ISP particularly attractive to users into free and 
open-source software, in which case I would have thought the CE marking 
is most likely to be coming from FQ-CoDel? Or can we just not really tell?

As the rest of your email changed subject to tunnels, I've split that 
into a separate thread.


>   - Jonathan Morton

Bob Briscoe