Why protocol stacks should be in user-space? Michio Honda (NEC Europe), JoaoTaveira Araujo (UCL), Luigi Rizzo (Universitea de Pisa), Costin Raiciu (Universitea Buchalest) Felipe Huici (NEC Europe) IETF87 MPTCP WG July 30, 2013 Berlin Motivation • Extending layer 4 functionality addresses a lot of problems – Increased performance • MPTCP, WindowScale, FastOpen,TLP, PRR – Ubiquitous encryption • Tcp