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KVM Virtualization Cookbook

You're reading from   KVM Virtualization Cookbook Learn how to use KVM effectively in production

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781788294676
Length 340 pages
Edition 1st Edition
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Author (1):
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Konstantin Ivanov Konstantin Ivanov
Author Profile Icon Konstantin Ivanov
Konstantin Ivanov
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Toc

Table of Contents (9) Chapters Close

Preface 1. Getting Started with QEMU and KVM FREE CHAPTER 2. Using libvirt to Manage KVM 3. KVM Networking with libvirt 4. Migrating KVM Instances 5. Monitoring and Backup of KVM Virtual Machines 6. Deploying KVM Instances with OpenStack 7. Using Python to Build and Manage KVM Instances 8. Kernel Tuning for KVM Performance

Tuning the kernel for network performance


Most modern Linux kernels ship sufficiently tuned for various network workloads. Some distributions provide predefined tuning services (a good example is tuned for Red Hat/CentOS), which include a set of profiles based on the server role.

Let's go over the steps taken during data transmission and reception, on a typical Linux host, before we delve into how to tune the hypervisor:

  1. The application first writes the data to a socket, which in turn is put in the transmit buffer.
  2. The kernel encapsulates the data into a Protocol Data Unit (PDU).
  3. The PDU is then moved onto the per-device transmit queue.
  4. The Network Interface Cards (NIC) driver then pops the PDU from the transmit queue and copies it to the NIC.
  5. The NIC sends the data and raises a hardware interrupt.
  6. On the other end of the communication channel, the NIC receives the frame, copies it on the receive buffer, and raises hard interrupt.
  7. The kernel in turn handles the interrupt and raises a soft interrupt...
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