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Re: [rtcweb] Meaning of SHOULD support/use interleaving

Eric Rescorla <ekr@rtfm.com> Tue, 28 October 2014 16:27 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 28 Oct 2014 09:25:32 -0700
Message-ID: <CABcZeBOuiTk8Ont314aenemUVPxkiLk7jScpZ3DR-90TuzN4NQ@mail.gmail.com>
To: Christer Holmberg <christer.holmberg@ericsson.com>
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Subject: Re: [rtcweb] Meaning of SHOULD support/use interleaving
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On Tue, Oct 28, 2014 at 8:46 AM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

> Hi,
>
> >>> I am not suggesting different flavors - I am suggesting to make the
> usage of
> >>> interleaving optional. Other SCTP features are also optional
> (including reliability, ordering etc).
> >>>
> >>> Where are these things optional? According to
> >>> https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-12#section
> >>> -6.1 an implementation MUST implement PR-SCTP and the support of the
> >>> FORWARD-TSN chunk will be negotiated similar to the NDATA chunk. I
> don't see a difference, especially not if we move to MUST support NDATA.
> >>
> >> For example, section 6.1 says:
> >>
> >>      "The partial reliability extension defined in [RFC3758] MUST be
> supported."
> >>
> >> However, in CLUE we say that a CLUE entity MUST NOT *use* the
> extension, as all CLUE messages are required to be sent reliably.
> >
> > That is OK. However, support for PR-SCTP MUST be there and it will be
> negotiated. You just never send a message with partial reliability. At
> least this is my understanding...
>
> So, can the same be done for interleaving? I.e. the support MUST be there,
> but e.g. CLUE entities can choose not to use it?
>
> Note that my issue is not about support, it's about usage :)


What resource is being conserved by not just requiring it?

-Ekr

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