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Last Call comments and changes for CCID 2

Last Call comments and changes for CCID 2. Sally Floyd DCCP WG, November 2004. Status:. The main feedback was from Mark Allman and Aaron Falk. No open questions. Topics : Why Byte Counting? Why at most one RTT sample per RTT? Minimum for ssthresh? Initial cwnd?

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Last Call comments and changes for CCID 2

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  1. Last Call comments and changes for CCID 2 Sally Floyd DCCP WG, November 2004

  2. Status: • The main feedback was from Mark Allman and Aaron Falk. • No open questions. • Topics: • Why Byte Counting? • Why at most one RTT sample per RTT? • Minimum for ssthresh? • Initial cwnd? • CCID 2 masquerading as CCID 1?

  3. Mark: Why Byte Counting? It is only Experimental in TCP. • CCID2 has congestion control on the reverse path. • Mark: • "IMO, ABC with a limit of increasing cwnd by no more than 50% per RTT is the right answer." • Added to the next revision.

  4. The Ack Ratio: • "In a scenario where a sender's cwnd is rapidly changing, this could cause a lot of feature negotiation possibly during a period of congestion on the forward path." • "The sender SHOULD not attempt Ack Ratio renegotiations more than once per round-trip time."

  5. Why at most one RTT sample per RTT? • Added: • "If more that one round-trip time measurement per round-trip time was used for these calculations, then the weights of the averagers would have to be adjusted,so that the average round-trip time is effectively derived from measurements over multiple round-trip times."

  6. Minimum for ssthresh? • Changed from two to one. • "I don't think it actually makes any functional difference."

  7. ECN: • Specify that the congestion window is only increased for packets that aren't ECN-marked.

  8. Initial cwnd: • Clarified to make it clear that the exact rules of RFC 3390 apply.

  9. CCID 2 masquerading as CCID 1? • A moot point, now that CCID 1 has been removed from the main spec.

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