1 / 4

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

margo
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)?

More Related