**8.9. IBM System/370 Architecture Overview**The IBM System/370 architecture utilizes a two-level memory structure, often described as segments and pages. Although this segmentation approach lacks several features mentioned earlier in this chapter, it serves a purpose in memory management. For the basic 370 architecture:- The page size can be either 2 KB or 4 KB.- The segment size is fixed at either 64 KB or 1 MB.For the 370/XA and 370/ESA architectures:- The page size is standardized at 4 KB.- The segment size is fixed at 1 MB.**Discussion Points:**- What are the potential disadvantages of this segmentation scheme?- What benefits does segmentation offer to the 370 architecture? **8.7.** In the VAX, user page tables are located at virtual addresses in the system space. What is the advantage of having user page tables in virtual rather than main memory? What is the disadvantage?*Explanation:*In the VAX computer architecture, user page tables can be stored at virtual addresses within the system space rather than directly in main memory. This setup has certain advantages and disadvantages:**Advantages:**1. **Increased Flexibility:** By using virtual addresses, the system can more flexibly manage memory, allowing for more efficient use of available memory resources.2. **Protection:** Storing page tables at virtual addresses can improve protection against unauthorized access, as it enables the system to apply access controls and permissions more effectively.**Disadvantages:**1. **Additional Overhead:** Managing page tables at virtual addresses can introduce additional computational overhead, as it requires translating virtual addresses to physical addresses.2. **Potential For Increased Latency:** Accessing page tables in virtual memory might increase latency compared to direct access in physical memory, potentially affecting system performance.

Answered: 8.7. In the VAX, user page tables are…

8.7. In the VAX, user page tables are located at virtual addresses in the system space. What is the advantage of having user page tables in virtual rather than main memory? What is the disadvantage?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 21VE

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Concept explainers

Fundamentals of memory

A collection of connected storage devices form the memory unit. It is a space to store data and instructions required for processing. Information is stored in a memory unit in the form of bits. There are two types of memory namely:

Question

**8.9. IBM System/370 Architecture Overview**

The IBM System/370 architecture utilizes a two-level memory structure, often described as segments and pages. Although this segmentation approach lacks several features mentioned earlier in this chapter, it serves a purpose in memory management.

For the basic 370 architecture:
- The page size can be either 2 KB or 4 KB.
- The segment size is fixed at either 64 KB or 1 MB.

For the 370/XA and 370/ESA architectures:
- The page size is standardized at 4 KB.
- The segment size is fixed at 1 MB.

**Discussion Points:**
- What are the potential disadvantages of this segmentation scheme?
- What benefits does segmentation offer to the 370 architecture?

**8.7.** In the VAX, user page tables are located at virtual addresses in the system space. What is the advantage of having user page tables in virtual rather than main memory? What is the disadvantage?

*Explanation:*

In the VAX computer architecture, user page tables can be stored at virtual addresses within the system space rather than directly in main memory. This setup has certain advantages and disadvantages:

**Advantages:**
1. **Increased Flexibility:** By using virtual addresses, the system can more flexibly manage memory, allowing for more efficient use of available memory resources.
2. **Protection:** Storing page tables at virtual addresses can improve protection against unauthorized access, as it enables the system to apply access controls and permissions more effectively.

**Disadvantages:**
1. **Additional Overhead:** Managing page tables at virtual addresses can introduce additional computational overhead, as it requires translating virtual addresses to physical addresses.
2. **Potential For Increased Latency:** Accessing page tables in virtual memory might increase latency compared to direct access in physical memory, potentially affecting system performance.

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