Re: [xrblock] Proposed change to summary discard draft to address discard type issue
Glen Zorn <glenzorn@gmail.com> Fri, 21 September 2012 06:26 UTC
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Date: Fri, 21 Sep 2012 13:26:29 +0700
From: Glen Zorn <glenzorn@gmail.com>
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To: "Huangyihong (Rachel)" <rachel.huang@huawei.com>
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Cc: xrblock <xrblock@ietf.org>
Subject: Re: [xrblock] Proposed change to summary discard draft to address discard type issue
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On 09/21/2012 12:55 PM, Huangyihong (Rachel) wrote: ... > > > In section 3.2.2, the description of Gap Discard Rate field, the > third paragraph. > > OLD TEXT: > > " > > where "number of packets discarded" is obtained from the RTCP XR > > Discard Block [DISCARD] and Packets Expected is calculated as the > > difference between "extended last sequence number" and "extended > > first sequence number" (Interval or Cumulative) provided in the > > Measurement Information block [MEASIDENT]. > > " > > NEW TEXT: > > " > > where "number of packets discarded" is filled with number of packets > due to both > > early and late to be played outwhich is obtained from the RTCP XR > > Discard Block [DISCARD], and Packets Expected is calculated > > as the difference between "extended last sequence number" and > "extended > > first sequence number" (Interval or Cumulative) provided in the > > Measurement Information block [MEASIDENT]. > > " > > > I would rewrite this as > > "where "number of packets discarded" is filled with the number of > packets discarded due to both early and late arrivalwhich is obtained > from the RTCP XRDiscard Block [DISCARD], and Packets Expected is > calculatedas the difference between "extended last sequence number" > and "extendedfirst sequence number" (Interval or Cumulative) provided > in The Measurement Information block [MEASIDENT]." > > But even so, it would imply that two instances of the RTCP XR Discard > Block are required, since a single Discard block can only report > discards due to either early or late arrival, not both. Is that your > intent? If so, then I would suggest making it explicit; if not, the > maybe just leave the text as it is. > > [Rachel]: I am okay with your proposed change. Also one instance is > sufficient since Discard draft supports reporting discards due to > both. Yes but the statement that the '"number of packets discarded" is filled with the number of packets discarded due to both early and late arrival which is obtained from the RTCP XR Discard Block" is only true if a) the "Discard Type" field in the Discard block is set to 11 or b) two instances of the Discard block are present, one with the DT field set to 10 & the other with the DT field set to 01. Do you think that that should be mentioned? ...
- [xrblock] Proposed change to summary discard draf… Huangyihong (Rachel)
- Re: [xrblock] Proposed change to summary discard … Qin Wu
- Re: [xrblock] Proposed change to summary discard … Glen Zorn
- Re: [xrblock] Proposed change to summary discard … Huangyihong (Rachel)
- Re: [xrblock] Proposed change to summary discard … Glen Zorn
- Re: [xrblock] Proposed change to summary discard … Huangyihong (Rachel)
- Re: [xrblock] Proposed change to summary discard … Qin Wu
- Re: [xrblock] Proposed change to summary discard … Glen Zorn
- Re: [xrblock] Proposed change to summary discard … Qin Wu