MRG Realtime 1.0

MRG Realtime 1.0

Realtime Tuning Guide

Red Hat Documentation Group

Copyright © 2008 Red Hat, Inc

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Abstract

This book contains advanced tuning procedures for the MRG Realtime component of the Red Hat Enterprise MRG distributed computing platform. For installation instructions, see the MRG Realtime Installation Guide.

Preface
1. Document Conventions
2. We Need Feedback!
1. Before you start tuning your MRG Realtime system
2. General System Tuning
2.1. Using the Tuna Interface
2.2. Setting persistent tuning parameters
2.3. Interrupt and Process Binding
2.4. Filesystem determinism tips
2.5. gettimeofday speedup
2.6. Don't run extra stuff
2.7. Swapping and Out Of Memory Tips
2.8. Network determinism tips
2.9. syslog tuning tips
2.10. The PC Card Daemon
3. Realtime-Specific Tuning
3.1. Setting Scheduler Priorities
3.2. MRG Realtime Specific gettimeofday speedup
3.3. Using kdump and kexec with the MRG Realtime kernel
3.4. TSC timer synchronization on Opteron CPUs
3.5. Infiniband
3.6. Non-Uniform Memory Access
3.7. Using the ftrace Utility for Tracing Latencies
3.8. Latency Tracing Using trace-cmd
3.9. Using sched_nr_migrate to limit SCHED_OTHER processes.
4. Application Tuning and Deployment
4.1. Signal Processing in Realtime Applications
4.2. Using sched_yield and Other Synchronization Mechanisms
4.3. Mutex options
4.4. TCP_NODELAY and Small Buffer Writes
4.5. Setting Realtime Scheduler Priorities
4.6. Dynamic Libraries Loading
5. More Information
5.1. Reporting Bugs
5.2. Further Reading
A. Revision History