Red_Hat_Enterprise_Linux-7-Virtualization_Tuning_and_Optimization_Guide-en-US.pdf

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Red Hat Enterprise Linux 7
Virtualization Tuning and
Optimization Guide
Optimizing your virtual environment
Dayle Parker
Scott Radvan
Red Hat Subject Matter Experts
Red Hat Enterprise Linux 7 Virtualization Tuning and Optimization Guide
Optimizing your virtual environment
Dayle Parker
Red Hat Engineering Co ntent Services
dayleparker@redhat.co m
Sco tt Radvan
Red Hat Engineering Co ntent Services
sradvan@redhat.co m
Red Hat Subject Matter Experts
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Abstract
T he Red Hat Enterprise Linux Virtualization T uning and Optimization Guide covers KVM and
virtualization performance. Within this guide you can find tips and suggestions for making full use of
KVM performance features and options for your host systems and virtualized guests.
Table of Contents
Table of Contents
⁠
C . . . . . . . Introduction
. .hapter. 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 . . . . . . . .
.
⁠
1.1. KVM Overview
2
⁠
1.2. KVM Performance Architecture Overview
2
⁠
1.3. Virtualization Performance Features and Improvements
2
⁠
C . . . . . . . Virt-manager
. .hapter. 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . . . . . . . .
.
⁠
2.1. Introduction
5
⁠
2.2. Operating System Details and Devices
5
⁠
2.3. CPU Performance Options
6
⁠
2.4. Virtual Disk Performance Options
10
⁠
C . . . . . . . . . . . .
. .hapter. 3. tuned. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 . . . . . . . .
..
⁠
3.1. Introduction
11
⁠
3.2. tuned and tuned-adm
11
⁠
C . . . . . . Networking
. .hapter. 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 . . . . . . . .
..
⁠
4 .1. Introduction
13
⁠
4 .2. Networking T uning T ips
13
⁠
4 .3. Virtio and vhost_net
13
⁠
4 .4. Device Assignment and SR-IOV
14
⁠
4 .5. Network T uning T echniques
14
⁠
C . . . . . . . Memory
. .hapter. 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 . . . . . . . .
..
⁠
5.1. Introduction
17
⁠
5.2. Memory T uning T ips
17
⁠
5.3. Memory T uning on Virtual Machines
17
⁠
C . . . . . . . Block . .
. .hapter. 6. . . . . . .I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 . . . . . . . .
..
⁠
6.1. Introduction
21
⁠
6.2. Block I/O T uning
21
⁠
6.3. Caching
22
⁠
6.4. I/O Mode
22
⁠
6.5. Block I/O T uning T echniques
23
⁠
C . . . . . . . NUMA
. .hapter. 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 . . . . . . . .
..
⁠
7.1. Introduction
25
⁠
7.2. Memory Allocation Policies
25
⁠
7.3. Automatic NUMA Balancing
25
⁠
7.4. libvirt NUMA T uning
26
⁠
7.5. NUMA-Aware Kernel SamePage Merging (KSM)
31
⁠
C . . . . . . . Performance Monitoring T . . .
. .hapter. 8. . . . . . . . . . . . . . . . . . . . . . . . .ools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 . . . . . . . .
..
⁠
8.1. Introduction
32
⁠
8.2. perf kvm
32
⁠
8.3. Virtual Performance Monitoring Unit (vPMU)
34
Revision History
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 . . . . . . . .
..
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