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vSphere High Performance Cookbook - Second Edition

You're reading from   vSphere High Performance Cookbook - Second Edition Recipes to tune your vSphere for maximum performance

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Product type Paperback
Published in Jun 2017
Publisher
ISBN-13 9781786464620
Length 338 pages
Edition 2nd Edition
Tools
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Authors (3):
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Christopher Kusek Christopher Kusek
Author Profile Icon Christopher Kusek
Christopher Kusek
Prasenjit Sarkar Prasenjit Sarkar
Author Profile Icon Prasenjit Sarkar
Prasenjit Sarkar
Kevin Elder Kevin Elder
Author Profile Icon Kevin Elder
Kevin Elder
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Toc

Table of Contents (11) Chapters Close

Preface 1. CPU Performance Design FREE CHAPTER 2. Memory Performance Design 3. Networking Performance Design 4. DRS, SDRS, and Resource Control Design 5. vSphere Cluster Design 6. Storage Performance Design 7. Designing vCenter on Windows for Best Performance 8. Designing VCSA for Best Performance 9. Virtual Machine and Virtual Environment Performance Design 10. Performance Tools

Virtual memory reclamation techniques

VMs perform memory allocation in the same way an operating system handles memory allocation and deallocation. The guest operating system frees a piece of physical memory by adding memory page numbers to the guest free list.

The guest operating system's free list is not accessible to the hypervisor; thus, it is difficult for the hypervisor to know when to free the host physical memory and when the guest physical memory needs to be freed. The hypervisor is completely unaware of which pages are free or allocated to the guest operating system, and because of this, it cannot reclaim the host physical memory when the guest operating system frees guest physical memory.

So the VMware hypervisor relies on memory reclamation techniques to reclaim the host physical memory that is freed by the guest operating system. These are the memory reclamation...

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