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Westwood+ is a sender-only modification of TCP Reno that optimizes the performance of TCP congestion control over both wired and wireless networks. TCP Westwood+ is based on end-to-end bandwidth estimation to set the congestion window and slow-start threshold after a congestion episode, that is, after three duplicate acknowledgments or a ...
TCP Westwood relies on mining the ACK stream for information to help it better set the congestion control parameters: Slow Start Threshold (ssthresh), and Congestion Window (cwin). In TCP Westwood, an "Eligible Rate" is estimated and used by the sender to update ssthresh and cwin upon loss indication, or during its "Agile Probing" phase, a ...
ssthresh is not mentioned; In Reno cwnd is not halved. ssthresh is often set to cwnd/2, but RFC 2581 recommends setting it to FlightSize/2. Herr Baum 20:31, 9 March 2007 (UTC) full algorithm in tcp tahoe graphs showing the characteristic 'shapes' of window size over time, for congestion avoidance and TCP slow-start.
Among this list is RFC 2581, TCP Congestion Control, one of the most important TCP-related RFCs in recent years, describes updated algorithms that avoid undue congestion. In 2001, RFC 3168 was written to describe Explicit Congestion Notification (ECN), a congestion avoidance signaling mechanism.
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MacOS adopted TCP CUBIC with the OS X Yosemite release in 2014, [5] [6] while the previous release OS X Mavericks still used TCP New Reno. [ 7 ] [ 8 ] Microsoft adopted it by default in Windows 10.1709 Fall Creators Update (2017), and Windows Server 2016 1709 update.