Contents

• Thanks to the members of the Linux mailing list for helping me with the implementation of T/TCP when I had problems.
• Thanks to Alan Cox, Albert Cahalan and David Miller for pointing out some of the pros and cons of T/TCP.
• Thanks to Ivan for pointing me in the right direction a number of times.
• Thanks to the residents of the TRL lab for letting me bounce ideas off them and setting up computers for me.
• Thanks to Mary for her impatience and lack of understanding and for reading my report.
• Thanks to my class mates for putting up with me.
• Thanks to my supervisors, John Nelson and Ivan Griffin for guiding me through the year.
• List of Figures
• Introduction
• The TCP/IP Reference Model
  • The Application Layer
  • The Transport Layer
  • The Network Layer
  • The Host-to-Network Layer
  • Summary
• Transport Layer Protocols
  • User Datagram Protocol
  • Transmission Control Protocol
    • Establishing the Connection
    • Data Transmission
    • Termination of Connection
  • Summary
• Transaction Transmission Control Protocol
  • What is a Transaction
  • Background to T/TCP
  • Basic Operation
  • TCP Accelerated Open
  • Truncation of TIME-WAIT
  • Examples
    • HTTP and RPC
    • DNS
  • Summary
• Linux Operating System
  • Introduction to Linux
  • Kernel Network Interface
    • Important Structures in the Linux Kernel [2]
  • Linux Protocol Stack
• Design and Implementation
  • Design Approach
  • State Processing
  • TCP Control Block
  • CC Options
    • Handling the CC Variable
    • tcp_calc_cc_options()
    • tcp_build_cc_options()
    • Recognising CC Options
  • Packet Validation
  • Routing Table
  • TAO Test
  • TCP Output
    • tcp_sendmsg
    • do_tcp_sendmsg
  • TCP Input
    • tcp_conn_request()
    • tcp_ack()
    • tcp_rcv()
      • Multi-Segment Processing
      • CCecho Processing
      • Simultaneous Open
    • tcp_accept()
  • TIME-WAIT Truncation
  • Dealing with Linux SYNACK's
  • TCP Statistics
  • Kernel Configuration Options
  • Summary
• Testing and Analysis
  • Operation Verification
    • Client Reboot
    • Normal T/TCP Transaction
    • Server Reboot
    • Request or Reply Exceeds MSS
    • Backward Compatibility
  • Performance Analysis
    • Number of Packets per Transaction
    • Time Comparisons
  • Memory Issues
  • Protocol Analysis
  • Summary
• Case Study: T/TCP Performance Over Suggested HTTP Improvements
  • Web Document Characteristics
  • Suggested Performance Improvements for HTTP
    • Compression
    • Delta Encoding
    • Persistent HTTP
  • Summary
• Socket Programming Under T/TCP
  • Lynx Web Browser
• Conclusion
• References
• Code
  • New Functions
    • tcp_calc_cc_options()
    • tcp_build_cc_options()
    • ttcp_connect()
  • Code Modifications
    • do_tcp_sendmsg()
    • tcp_accept()
    • tcp_options()
    • tcp_conn_request()
    • tcp_ack()
    • tcp_data()
    • tcp_rcv()
      • tcp_rcv() - multisegment processing
      • tcp_rcv() - ccecho processing
      • tcp_rcv - simultaneous open
      • TIME-WAIT Truncation
    • tcp_send_synack()
• Test Code
  • T/TCP Test Client
  • TCP Test Client
  • T/TCP Test Server
  • read_stream.c
  • cliserv.h
  • Test Script
  • Statistics Generation Script
• About this document ...