Practice Major Issues With Program I/o And Interrupt I/o (29.4.1) - Overview of DMA and Interrupt Driven I/O

Practice: Major Issues with Program I/O and Interrupt I/O

Lesson 29.4.1Overview of DMA and Interrupt Driven I/O

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8 questions

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6 sample questions

Question 1.
What is DMA?
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Think about how devices communicate with CPU without direct intervention.
Question 2.
What does context switching refer to?
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It happens in interrupt-driven I/O when the CPU is interrupted.
3Question 3.
What is a primary advantage of using DMA over interrupt-driven I/O?
- It requires less hardware
- It does not require CPU intervention
- It is faster in all cases
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Think about how each method utilizes CPU resources.
4Question 4.
True or False: Cycle stealing mode allows the CPU to have full control of the bus during DMA transfers.
- True
- False
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Recall how bus access is shared during data transfer.
Question 5.
You need to design a computer system that uses DMA. What factors will you consider to optimize performance?
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Think about the workloads and what configurations would maximize throughput.
Question 6.
If a CPU can handle 8,000 I/O interrupts per second and a device needs to send 16 MB of data. Calculate how often the device would require the CPU's attention if using interrupt-driven I/O.
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Understand how to convert megabytes to bytes and then calculate interrupts. Divide the data by the size of each interrupt's handling capacity.

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