Re: [tcpm] [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-00.txt

"Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> Fri, 12 July 2019 19:39 UTC

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From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net>
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To: "Black, David" <David.Black@dell.com>
Date: Fri, 12 Jul 2019 12:39:47 -0700 (PDT)
CC: "rgrimes@freebsd.org" <rgrimes@freebsd.org>, "tcpm@ietf.org" <tcpm@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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Subject: Re: [tcpm] [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-00.txt
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> Rod,
> 
> This draft appears to be focused on obtaining a TCP header bit for SCE.

Yes, that is correct.

> As an alternative to this single-bit proposal, please take a look at draft-ietf-tcpm-accurate-ecn (https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/) and consider how that functionality might (or might not) be usable with SCE. 

I specifically did not do what Accurate Ecn attempts as that requires
a TCP option negotiation at connection establishment to negotiate the
overloading of other TCP header bits.  SCE only needs 1 new bit, and
does not alter the behavior of any current bits.

This proposal (TCPSCE) does not in any way effect the current use of
any of the other bits, and use of the NS bit should be fully backwards
compatible and ignored by pre SCE implementations and does not require
a TCP option negotiation.

I have to get additional data but have been lead to understand that
adding a tcp option and doing that negotiation is going to cause a
great deal of pain in the ability to deploy accurate ecn as it is
currently designed due to middle box inspection and handling.

Regards,
Rod

> Thanks, --David
> 
> > -----Original Message-----
> > From: tsvwg <tsvwg-bounces@ietf.org>; On Behalf Of Rodney W. Grimes
> > Sent: Monday, July 8, 2019 8:07 PM
> > To: tcpm@ietf.org; tsvwg@ietf.org
> > Subject: [tsvwg] New Version Notification for draft-grimes-tcpm-tcpsce-
> > 00.txt
> > 
> > 
> > [EXTERNAL EMAIL]
> > 
> > I have posted a new version with updated proper tcpm working group
> > name of draft-grimes-tcpm-tcpsce-00
> > (formerly draft-grimes-tcpmwg-tcpsce-00.txt)
> > 
> > This is first cut at how SCE works in TCP
> > 
> > Cross posting this to both tsvwg and tcpm due to overlap
> > 
> > 
> > > A new version of I-D, draft-grimes-tcpm-tcpsce-00.txt
> > > has been successfully submitted by Rodney W. Grimes and posted to the
> > > IETF repository.
> > >
> > > Name:		draft-grimes-tcpm-tcpsce
> > > Revision:	00
> > > Title:		Some Congestion Experienced in TCP
> > > Document date:	2019-07-08
> > > Group:		Individual Submission
> > > Pages:		5
> > > URL:            https://www.ietf.org/internet-drafts/draft-grimes-tcpm-tcpsce-
> > 00.txt
> > > Status:         https://datatracker.ietf.org/doc/draft-grimes-tcpm-tcpsce/
> > > Htmlized:       https://tools.ietf.org/html/draft-grimes-tcpm-tcpsce-00
> > > Htmlized:       https://datatracker.ietf.org/doc/html/draft-grimes-tcpm-
> > tcpsce
> > >
> > >
> > > Abstract:
> > >    This memo classifies a TCP code point ESCE ("Echo Some Congestion
> > >    Experienced") for use in feedback of IP code point SCE ("Some
> > >    Congestion Experienced").
> > 
> > --
> > Rod Grimes                                                 rgrimes@freebsd.org
> 
> 
> 

-- 
Rod Grimes                                                 rgrimes@freebsd.org