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CS-NoteBook
  • Introduction
  • CS144
    • concise introduction to Internet
      • 1.1 Networked Applications
      • 1.2 The 4 Layer Internet
      • 1.3 IP
      • 1.4 A Day in the Life of a Packet
      • 1.5 Principle: Packet Switching
      • 1.6 Principle:Layering
      • 1.7 Principle: Encapsulation
      • 1.8 Byte order and packet formats
      • 1.9 name and addresses:IPv4
      • 1.10 Longest Prefix Match for Link Layer
      • 1.11 Address Resolution Protocol(ARP)
      • 1.12 Summary
    • Transport Layer
      • 2.1 The TCP Service Model
      • 2.2 UDP service model
      • 2.3 ICMP(Internet Control Message Protocol 互联网报文控制协议)
      • 2.4 The End-to-End Principle
      • 2.5 Error Detection:3 schemes (Checksum,CRC and MAC)
      • 2.6 Finite State Machines(有限状态机)
      • 2.7 Flow Control
      • 2.8 Sliding window
      • 2.9 Retransmission Strategies
      • 2.10 TCP Header
      • 2.11 TCP Setup and Teardown
      • 2.12 Recap
    • Package Switching
      • 3.1 The history of Internet
      • 3.2 What is packet switching
      • [3.3 End-to-end delay and Queueing delay
      • 3.4 Playback Buffer(回放缓存区)
  • CS 61C
    • 1.4 C Memory Mangement, Usage
    • 1.5 Intro to Assembly Language, MIPS Intro
    • 1.5 extra bits operation
  • CS 61B
  • CS 61A
    • Function
    • Names
    • The Art of the Function
    • Control
    • Higher-Order Function
    • Recursive Function
    • List
    • Non-Local Assignment
    • Iterators
    • Objects
    • Data Abstraction
    • OOP
    • Inheritance
    • Representations
    • Decomposition
    • Scheme
    • Exceptions
    • Calculator
    • Interpreters
    • Declarative_Programming
    • Table
    • Aggregation
      • More_recursion
    • Databases
    • Distributed_Data
    • Tail Recursion
    • Exercises
      • lab00
      • lab01
      • hw01
      • tree Recursion example -- give Change
  • The Web DevelopMent Bootcamp
    • html5
    • css
    • bootstrap3
    • bootstrap4
    • javascript expression
    • javascript function
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  1. CS144
  2. Package Switching

3.4 Playback Buffer(回放缓存区)

Previous[3.3 End-to-end delay and Queueing delayNextCS 61C

Last updated 4 years ago

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Real-time 应用 (Youtube/Skype) 特别关心排队延迟

CumulativeBytesVSTime

  • 横向方向

    • Variable delay

  • 纵向方向

    • 有多少 bytes 在网络中

  • 横向方向

    • 这个 bytes 缓存了多长时间

  • 纵向方向

    • 缓存了多少 bytes

  • 如果缓存不足

    • rebuffering 重新缓存

Summary

  • packet switching 使得 end-to-end delay 是可变的

  • 我们使用 playback buffer 来 asorb the variation

  • playback buffer 可以很大，但会导致一开始缓存时间很长

  • applications 预估 delay，设置 playback buffer，如果 delay 变化则 resize the buffer

PlaybackbufferwithPlaying
playbackBuffer