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Michael Welzl (University of Oslo) Gorry Fairhurst (University of Aberdeen)

The Benefits to Applications of using Explicit Congestion Notification (ECN ) draft‐ welzl ‐ ecn ‐benefits. Michael Welzl (University of Oslo) Gorry Fairhurst (University of Aberdeen) . 90th IETF Meeting Toronoto , July 2014 . Draft goals. Goals:     – document gains of ECN

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Michael Welzl (University of Oslo) Gorry Fairhurst (University of Aberdeen)

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  1. The Benefits to Applications of using Explicit Congestion Notification (ECN)draft‐welzl‐ecn‐benefits Michael Welzl (University of Oslo) Gorry Fairhurst (University of Aberdeen) 90th IETF Meeting Toronoto, July 2014

  2. Draft goals Goals:     – document gains of ECN   – includes less obvious gains   – may include deployment scenarios to illustrate benefit Non-goals:   – it does not recommend any router/endpoint behaviour - it does not define new mechanisms . . . in short, "a Manifesto for deploying ECN"

  3. ECN advantages seem obvious • ECN marks instead of dropping ECN-capable packets A receiver gets packets instead of loosing them [RFC2884] However, often few congestion drops [RFC3649] • Biggest gain can be congestion indication without loss recovery Reduced Head-­of­‐Line Blocking for in-order transports Reduced probability of timeout (RTO Expiry) - RTO collapses cwnd, with significant bad impact Some applications do not retransmit lost packets Typically VoIP, interactive video, realtime data - Needs loss­hidingmechanisms, impacts perceived quality

  4. Main Message People should configure host stacks and network devices to enable ECN - because it will make things better! Application developers should, where possible, use transports that enable ECN - because this will make things better, without people needing to rewrite apps! We think this document is useful! - Is anyone able to help us articulate the gains? - Can we make this a WG item (in tsvwg or the AQM wg)?

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