TCP Streams as Sessions

• Advantages:

• • Stream costs amortized across many ADUs

• Disadvantages:

• • TCP's reliability/ordering applies across many ADUs
  • • Unnecessary serialization: no parallelism between ADUs
    • Head-of-line blocking: one loss delays everything behind
    • ⇒ TCP unusable for real-time video/voice conferencing
    • ⇒ HTTP/1.1 made web browsers slower! [Nielsen/W3C]
  • Makes applications more complicated
  • • Pipelined HTTP/1.1 still not widely used after 7 years!