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System Analysis and Tuning Guide
  1. About This Guide
  2. I Basics
    1. 1 General Notes on System Tuning
  3. II System Monitoring
    1. 2 System Monitoring Utilities
    2. 3 Analyzing and Managing System Log Files
  4. III Kernel Monitoring
    1. 4 SystemTap—Filtering and Analyzing System Data
    2. 5 Kernel Probes
    3. 6 Hardware-Based Performance Monitoring with Perf
    4. 7 OProfile—System-Wide Profiler
  5. IV Resource Management
    1. 8 General System Resource Management
    2. 9 Kernel Control Groups
    3. 10 Automatic Non-Uniform Memory Access (NUMA) Balancing
    4. 11 Power Management
  6. V Kernel Tuning
    1. 12 Tuning I/O Performance
    2. 13 Tuning the Task Scheduler
    3. 14 Tuning the Memory Management Subsystem
    4. 15 Tuning the Network
  7. VI Handling System Dumps
    1. 16 Tracing Tools
    2. 17 Kexec and Kdump
    3. 18 Using systemd-coredump to Debug Application Crashes
  8. VII Synchronized Clocks with Precision Time Protocol
    1. 19 Precision Time Protocol
  9. A GNU Licenses
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System Analysis and Tuning Guide

An administrator's guide for problem detection, resolution and optimization. Find how to inspect and optimize your system by means of monitoring tools and how to efficiently manage resources. Also contains an overview of common problems and solutions and of additional help and documentation resources.

Publication Date: December 16, 2020
About This Guide
Available Documentation
Giving Feedback
Documentation Conventions
I Basics
1 General Notes on System Tuning
1.1 Be Sure What Problem to Solve
1.2 Rule Out Common Problems
1.3 Finding the Bottleneck
1.4 Step-by-step Tuning
II System Monitoring
2 System Monitoring Utilities
2.1 Multi-Purpose Tools
2.2 System Information
2.3 Processes
2.4 Memory
2.5 Networking
2.6 The /proc File System
2.7 Hardware Information
2.8 Files and File Systems
2.9 User Information
2.10 Time and Date
2.11 Graph Your Data: RRDtool
3 Analyzing and Managing System Log Files
3.1 System Log Files in /var/log/
3.2 Viewing and Parsing Log Files
3.3 Managing Log Files with logrotate
3.4 Monitoring Log Files with logwatch
3.5 Using logger to Make System Log Entries
III Kernel Monitoring
4 SystemTap—Filtering and Analyzing System Data
4.1 Conceptual Overview
4.2 Installation and Setup
4.3 Script Syntax
4.4 Example Script
4.5 User Space Probing
4.6 For More Information
5 Kernel Probes
5.1 Supported Architectures
5.2 Types of Kernel Probes
5.3 Kprobes API
5.4 debugfs Interface
5.5 For More Information
6 Hardware-Based Performance Monitoring with Perf
6.1 Hardware-Based Monitoring
6.2 Sampling and Counting
6.3 Installing Perf
6.4 Perf Subcommands
6.5 Counting Particular Types of Event
6.6 Recording Events Specific to Particular Commands
6.7 For More Information
7 OProfile—System-Wide Profiler
7.1 Conceptual Overview
7.2 Installation and Requirements
7.3 Available OProfile Utilities
7.4 Using OProfile
7.5 Generating Reports
7.6 For More Information
IV Resource Management
8 General System Resource Management
8.1 Planning the Installation
8.2 Disabling Unnecessary Services
8.3 File Systems and Disk Access
9 Kernel Control Groups
9.1 Overview
9.2 Resource accounting
9.3 Setting Resource Limits
9.4 Preventing Fork Bombs with TasksMax
9.5 Controlling I/O with Proportional Weight Policy
9.6 For More Information
10 Automatic Non-Uniform Memory Access (NUMA) Balancing
10.1 Implementation
10.2 Configuration
10.3 Monitoring
10.4 Impact
11 Power Management
11.1 Power Management at CPU Level
11.2 In-Kernel Governors
11.3 The cpupower Tools
11.4 Special Tuning Options
11.5 Troubleshooting
11.6 For More Information
11.7 Monitoring Power Consumption with powerTOP
V Kernel Tuning
12 Tuning I/O Performance
12.1 Switching I/O Scheduling
12.2 Available I/O Elevators with blk-mq I/O path
12.3 I/O Barrier Tuning
13 Tuning the Task Scheduler
13.1 Introduction
13.2 Process Classification
13.3 Completely Fair Scheduler
13.4 For More Information
14 Tuning the Memory Management Subsystem
14.1 Memory Usage
14.2 Reducing Memory Usage
14.3 Virtual Memory Manager (VM) Tunable Parameters
14.4 Monitoring VM Behavior
15 Tuning the Network
15.1 Configurable Kernel Socket Buffers
15.2 Detecting Network Bottlenecks and Analyzing Network Traffic
15.3 Netfilter
15.4 Improving the Network Performance with Receive Packet Steering (RPS)
VI Handling System Dumps
16 Tracing Tools
16.1 Tracing System Calls with strace
16.2 Tracing Library Calls with ltrace
16.3 Debugging and Profiling with Valgrind
16.4 For More Information
17 Kexec and Kdump
17.1 Introduction
17.2 Required Packages
17.3 Kexec Internals
17.4 Calculating crashkernel Allocation Size
17.5 Basic Kexec Usage
17.6 How to Configure Kexec for Routine Reboots
17.7 Basic Kdump Configuration
17.8 Analyzing the Crash Dump
17.9 Advanced Kdump Configuration
17.10 For More Information
18 Using systemd-coredump to Debug Application Crashes
18.1 Use and Configuration
VII Synchronized Clocks with Precision Time Protocol
19 Precision Time Protocol
19.1 Introduction to PTP
19.2 Using PTP
19.3 Synchronizing the Clocks with phc2sys
19.4 Examples of Configurations
19.5 PTP and NTP
A GNU Licenses
A.1 GNU Free Documentation License
List of Figures
2.1 Example Graph Created with RRDtool
11.1 powerTOP in Interactive Mode
11.2 HTML powerTOP Report
17.1 YaST Kdump Module: Start-Up Page
List of Tables
2.1 List of Query Options of ethtool
11.1 C-States
12.1 MQ-DEADLINE tunable parameters
12.2 BFQ tunable parameters
12.3 KYBER tunable parameters
List of Examples
2.1 vmstat Output on a Lightly Used Machine
2.2 vmstat Output on a Heavily Used Machine (CPU bound)
3.1 Example for /etc/logrotate.conf
4.1 Simple SystemTap Script
4.2 Probe with Timer Event
4.3 printf Function with Format Specifiers
4.4 Using Global Variables
4.5 Monitoring Incoming TCP Connections with tcp_connections.stp
11.1 Example Output of cpupower frequency-info
11.2 Example Output of cpupower idle-info
11.3 Example cpupower monitor Output
17.1 Kdump: Example Configuration Using a Static IP Setup
19.1 Slave clock using software time stamping
19.2 Slave clock using hardware time stamping
19.3 Master clock using hardware time stamping
19.4 Master clock using software time stamping (not generally recommended)

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