Re: [MMUSIC] TIAS Bandwidth in draft-ietf-mmusic-sdp-mux-attributes-10
Magnus Westerlund <magnus.westerlund@ericsson.com> Thu, 17 December 2015 15:34 UTC
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To: Suhas Nandakumar <suhasietf@gmail.com>
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
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Date: Thu, 17 Dec 2015 16:34:02 +0100
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Cc: draft-ietf-mmusic-sdp-mux-attributes@tools.ietf.org, "mmusic (E-mail)" <mmusic@ietf.org>
Subject: Re: [MMUSIC] TIAS Bandwidth in draft-ietf-mmusic-sdp-mux-attributes-10
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Den 2015-09-22 kl. 23:25, skrev Suhas Nandakumar: > Hello Magnus > > Many thanks for the analysis and sorry for the delayed response. > I agree with you on the overhead across bundle group being same and > go with multiply first and sum next. > > Given that, I see the current assignment is SPECIAL and the note > clarifies the point. > > So the question is should we keep the current assignment and note same > or are you recommending a change in them ? Hi, Prodded by WG shepherd. I think SPECIAL should be retained, but the procedure on how to derive the value should be clarified so that it always work. As noted, if one calculate the product on a per m= basis then sum across the media blocks in the bundle, one will arrive at correct value. And the errors in the description needs to be corrected. I also think one should note why the order matters, so that people who have the same overhead don't go "hu, that looks strange and wrong". Cheers Magnus > > Cheers > Suhas > > On Fri, Sep 11, 2015 at 7:28 AM, Magnus Westerlund > <magnus.westerlund@ericsson.com <mailto:magnus.westerlund@ericsson.com>> > wrote: > > Hi, > > I looked at Section 6.3 of draft-ietf-mmusic-sdp-mux-attributes-10 > and reacted to the below text. > > NOTE: The intention of TIAS is that the media level bit-rate is > multiplied with the known per-packet overhead for the selected > transport and the maxprate value to determine the worst case > bit-rate > from the transport to more accurately capture the required usage. > Summing TIAS values independently across "m=" lines and multiplying > the computed sum with maxprate and the per-packet overhead would > inflate the value significantly. Instead performing multiplication > and adding the individual values is a more appropriate usage. > > First, there is no difference between multiplying on m= block basis > and then summing versus first making the additions of the maxprate > and then multiplying given that the overhead value is the same for > all m= blocks. > > Only if the overhead value is different do one need to multiply on > m= block basis first and then adding the values together. However, > based on the definition for overhead and how bundle groups work, I > don't really expect different overhead values. > > It might be best to recommend that one does perform the > multiplication first and then addition between m= blocks to be > certain. But, I think the motivation should be more in case there > should arise future cases where overhead may have different values > within a bundle group. > > Comments? > > cheers > > Magnus Westerlund > > ---------------------------------------------------------------------- > Services, Media and Network features, Ericsson Research EAB/TXM > ---------------------------------------------------------------------- > Ericsson AB | Phone +46 10 7148287 > <tel:%2B46%2010%207148287> > Färögatan 6 | Mobile +46 73 0949079 > <tel:%2B46%2073%200949079> > SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com > <mailto:magnus.westerlund@ericsson.com> > ---------------------------------------------------------------------- > > _______________________________________________ > mmusic mailing list > mmusic@ietf.org <mailto:mmusic@ietf.org> > https://www.ietf.org/mailman/listinfo/mmusic > > -- Magnus Westerlund ---------------------------------------------------------------------- Services, Media and Network features, Ericsson Research EAB/TXM ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Färögatan 6 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com ----------------------------------------------------------------------
- [MMUSIC] TIAS Bandwidth in draft-ietf-mmusic-sdp-… Magnus Westerlund
- Re: [MMUSIC] TIAS Bandwidth in draft-ietf-mmusic-… Suhas Nandakumar
- Re: [MMUSIC] TIAS Bandwidth in draft-ietf-mmusic-… Magnus Westerlund