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

[Pete Heist <[e-mail]>]

Yes, that was somewhat unexpected to us at first too, but misuse of the
ECN field esp. on non-TCP packets seems to explain it in cases where
there ratios don't look like AQM signaling. The data for TCP is overall
easier to attribute to ECN when you can see feedback via ECE.

I didn't editorialize much on the results, but I'll use this as a
chance to add what struck me:

* While ECN negotiations were relatively small at around 1.44%, they
were spread across 45% of the IPs, so the proportion of paths using it
seems significant.

* The data seem to show significant 3168 marking AQM deployment, when
24% of LAN IPs that negotiated ECN saw CE or ECE. The draft mentions
how some of it is from known AQM instances and some not. Congestion
overall doesn't seem excessive, but that could be quantified better.

* A wider survey might help on the non-TCP data.

Anyway thanks for taking a look...

Pete

On Fri, 2021-02-19 at 11:44 +0000, Mirja Kuehlewind wrote:
> Hi Pete,
> 
> thanks for putting this together and sharing!
> 
> I have one question on the data. Maybe I'm not readying this
> correctly but if I look at the big table at the end, then I see a lot
> of cases where there are much more CE marks than ECT(0) marks. That's
> a bit unexpected as usually an AQM should only mark a small portion
> of the packets. Or do I interpret the data there incorrectly?
> 
> Mirja
> 
> 
> 
> On 18.02.21, 17:38, "tsvwg on behalf of Pete Heist"
> <[e-mail] on behalf of [e-mail]> wrote:
> 
> 
>     > A new version of I-D, draft-heist-tsvwg-ecn-deployment-
> observations-00.txt
>     > has been successfully submitted by Peter G. Heist and posted to
> the
>     > IETF repository.
>     > 
>     > Name:             draft-heist-tsvwg-ecn-deployment-observations
>     > Revision: 00
>     > Title:            Explicit Congestion Notification (ECN)
> Deployment Observations
>     > Document date:    2021-02-18
>     > Group:            Individual Submission
>     > Pages:            27
>     > URL:           
> https://www.ietf.org/archive/id/draft-heist-tsvwg-ecn-deployment-observations-00.txt
>     > Status:        
> https://datatracker.ietf.org/doc/draft-heist-tsvwg-ecn-deployment-observations/
>     > Html:          
> https://www.ietf.org/archive/id/draft-heist-tsvwg-ecn-deployment-observations-00.html
>     > Htmlized:      
> https://tools.ietf.org/html/draft-heist-tsvwg-ecn-deployment-observations-00
>     > 
>     > Abstract:
>     >   This note presents data gathered at an Internet Service
> Provider's
>     >   gateway on the observed deployment and usage of ECN. 
> Relevant IP
>     >   counter and flow tracking data was collected and analyzed for
> TCP and
>     >   other protocols.
> 
>     This draft adds some data on the current usage of ECN. It was
> gathered over several weeks at a cooperative ISP with around 660
> members, and looks at ECN endpoint activity, AQM deployment and ECN
> usage on non-TCP protocols. While this study is still relatively
> small, it’s hopefully at least a little more useful than the
> stateless counter data I posted late last year, which should set the
> bar suitably low… :)
> 
>     Pete
> 
>