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Should RFC 2861 on TCP Congestion Window Validation move towards Proposed Standard?

Should RFC 2861 on TCP Congestion Window Validation move towards Proposed Standard?. RFC 2861 authors: Mark Handley, Jitendra Padhye, and Sally Floyd TCPM July 2007. Comparing RFC 2581 and RFC 2861. Response to idle periods > an RTO: RFC 2581: SHOULD set cwnd to initial window.

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Should RFC 2861 on TCP Congestion Window Validation move towards Proposed Standard?

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  1. Should RFC 2861 on TCP Congestion Window Validation move towards Proposed Standard? RFC 2861 authors: Mark Handley, Jitendra Padhye, and Sally Floyd TCPM July 2007

  2. Comparing RFC 2581 and RFC 2861 • Response to idle periods > an RTO: • RFC 2581: SHOULD set cwnd to initial window. • RFC 2861: Halve cwnd, towards initial window. Slow-start back up. • Response to data-limited periods > an RTO: • RFC 2581: Don’t reduce cwnd at all. • RFC 2861: Halve cwnd towards flight size. Slow-start back up. • Note: RFC 2581 has completely different responses to idle and to data-limited periods!

  3. What do current TCPs actually do? • Some use CWV for response to idle periods. • Enabled by default in Linux. • Implemented by Microsoft, but not enabled. • Some don’t reduce cwnd at all after idle periods? • Do any follow the SHOULD in RFC 2581? • (and slow-start after an idle period?) What about the response to data-limited periods? (E.g., sending one packet per RTO)?

  4. How to evaluate CWV? • Which is better for a connection: • to use CWV? • or to use RFC 2581? • Which is better: • when all N active connections use CWV? • or when all N active connections use RFC 2581? • When there is no congestion, connections would prefer the least restrictive approach: • Never reducing cwnd after idle or data-limited periods.

  5. Does it matter whether CWV moves towards Proposed Standard? • It could matter for TCP implementations. • It matters for revising TFRC (RFC3448),for the response to data-limited periods: • Should RFC3448bis follow RFC 2581? • Or follow CWV?

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