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

On 27 Oct 2014, at 15:19, Christer Holmberg <christer.holmberg@ericsson.com> wrote:

> Hi,
> 
>>> Within the CLUE WG, we had a discussion regarding the following statement in section 6.1 of draft-ietf-rtcweb-data-channel-12.txt:
>>> 
>>> "The support for message interleaving as defined in
>>>                [I-D.ietf-tsvwg-sctp-ndata] SHOULD be used."
>>> 
>>> First, it is a little unclear what "the support SHOULD be used" means.
>> 
>> My understanding is that SCTP implementations supporting the extension will use it.
>> This is negotiated during the setup of the SCTP association.
> 
> If it's done on SCTP level, why do we need to talk about it in the data channel draft? 
We need to specify somewhere that the extension is used and how to map the priorities
of data channels to some protocol mechanism. This is done in this document.
> 
> Is there a reason why it is important to use it for data channels? If so, does it apply to data channels in general? 
As it is written right now: yes.

Best regards
Michael
> 
> Regards,
> 
> Christer
> 
> 
> 
> Whether messages are interleaved or not depends on the stream scheduler. This is a sender side only decision. The receiver has to deal with it.
> It is not a MUST, since there are implementations now in use which don't support the extension.
> 
> Best regards
> Michael
>> 
>> Second, does it mean that any data channel protocol (e.g CLUE) SHOULD use interleaving, even if the characteristics of the protocol wouldn't require it?
>> 
>> Regards,
>> 
>> Christer
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> 
> 