<aside> 💥 OBJECTIVES

• Explore the structure of an operating system’s I/O subsystem
• Discuss the principles of I/O hardware
• Provide details of the performance aspects of I/O hardware and software </aside>

复习ppt里提到的内容：

Untitled

DIRECT MEMORY ACCESS直接存储器访问

应用程序I/O接口

Blocking and Nonblocking I/O

调度机制

Untitled

Device-status table

Performance

我认为重要的：

懒得看了

Overview

I/O Hardware

I/O HARDWARE

Application I/O Interface

APPLICATION I/O INTERFACE

Kernel I/O Subsystem

KERNEL I/O SUBSYSTEM