Tag: TIMELY

TIMELY

Posted on by lechuck park

With Claude
TIMELY (Transport Informed by MEasurement of LatencY)

  1. System Architecture
  • Cloud/Data Center to External Network Connection
  • TIMELY Module Process at Kernel Level
  • Bidirectional Operation Support
  • TCP Protocol Based
  1. RTT-based Traffic Control Components
  • RTT Monitoring
    • 5-tuple monitoring (Src/Dst IP, Src/Dst Port, Protocol)
    • Real-time latency measurement
  • Congestion Detection
    • Network congestion detection through RTT increases
  • Congestion Window Adjustment
    • Control of send buffer size
  • MSS-based Adjustments
    • Congestion window adjustments in MSS units
  1. Related RTT-based Technologies
  • TCP BBR
  • TCP Vegas
  • CUBIC TCP
  1. Advantages of RTT-based Control
  • Proactive congestion detection before packet loss
  • Real-time network state awareness
  • Efficient buffer management
  • Lower latency in data transmission
  • Effective bandwidth utilization
  • Better performance in high-speed networks
  1. Disadvantages of RTT-based Control
  • RTT measurement accuracy dependency
  • Complex implementation at kernel level
  • Potential overhead in RTT monitoring
  • Need for continuous RTT measurement
  • Sensitivity to network jitter
  • May require adjustments for different network environments

The TIMELY system demonstrates an efficient approach to network congestion control using RTT measurements, particularly suitable for cloud and data center environments where latency and efficient data transmission are critical. The system’s kernel-level implementation and MSS-based adjustments provide fine-grained control over network traffic, though success heavily depends on accurate RTT measurements and proper environment calibration.

TCP Reliable 3

Posted on by lechuck park

From Claude with some prompting
RTT is measured by sending a packet (SEQ=A) and receiving an acknowledgment (ACK), providing insights into network latency. Bandwidth is measured by sending a sequence of packets (SEQ A to Z) and observing the amount of data transferred based on the acknowledgment of the last packet.

This image explains how to measure round-trip time (RTT) and bandwidth utilization to control and optimize TCP (Transmission Control Protocol) communications. The measured metrics are leveraged by various mechanisms to improve the reliability and efficiency of TCP.

These measured metrics are utilized by several mechanisms to enhance TCP performance. TCP Timeout sets appropriate timeout values by considering RTT variation. TIMELY provides delay information to the transport layer based on RTT measurements.

Furthermore, TCP BBR (Bottleneck Bandwidth and Round-trip propagation time) models the bottleneck bandwidth and RTT propagation time to determine the optimal sending rate according to network conditions.

In summary, this image illustrates how measuring RTT and bandwidth serves as the foundation for various mechanisms that improve the reliability and efficiency of the TCP protocol by adapting to real-time network conditions.