> Apps have been free to abuse UDP all this time, but it's not been a real issue. Even data-hungry applications like video-streaming have gone with TCP almost

> Apps have been free to abuse UDP all this time, but it's not been a real issue. Even data-hungry applications like video-streaming have gone with TCP almost every time. In the past Bittorrent and the creation of the µTP prooved ( http://blog.bittorrent.com/2009/11/13/testing-%C2%B5tp-is-%C2%B5tp-actually-faster-than-regular-bittorrent/ http://blog.bittorrent.com/2009/11/13/testing-%C2%B5tp-is-%C... ) that unmanaged protocol abuse in userspace can lead to big degradation in QOS yes. Mainly due to "unfair" congestion policy between protocols.