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Oracle Solaris Tunable Parameters Reference Manual     Oracle Solaris 11 Express 11/10
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1.  Overview of Oracle Solaris System Tuning

2.  Oracle Solaris Kernel Tunable Parameters

3.  NFS Tunable Parameters

4.  Internet Protocol Suite Tunable Parameters

5.  Network Cache and Accelerator Tunable Parameters

6.  System Facility Parameters

A.  Tunable Parameters Change History

B.  Revision History for This Manual



The Oracle Solaris Tunable Parameters Reference Manual provides reference information about Oracle Solaris OS kernel and network tunable parameters. This manual does not provide tunable parameter information about desktop systems or Java environments.

This manual contains information for both SPARC based and x86 based systems.

Note - This Oracle Solaris release supports systems that use the SPARC and x86 families of processor architectures. The supported systems appear in the Oracle Solaris Hardware Compatibility List at This document cites any implementation differences between the platform types.

In this document these x86 terms mean the following:

For supported systems, see Oracle Solaris Hardware Compatibility List at

Who Should Use This Book

This book is intended for experienced Solaris system administrators who might need to change kernel tunable parameters in certain situations. For guidelines on changing Solaris tunable parameters, refer to Tuning a Solaris System.

How This Book Is Organized

The following table describes the chapters and appendixes in this book.

An overview of tuning a Solaris system. Also provides a description of the format used in the book to describe the kernel tunables.
A description of Solaris kernel tunables such as kernel memory, file system, process size, and paging parameters.
A description of NFS tunables such as caching symbolic links, dynamic retransmission, and RPC security parameters.
A description of TCP/IP tunables such as IP forwarding, source routing, and buffer-sizing parameters.
A description of tunable parameters for the Network Cache and Accelerator (NCA).
A description of parameters used to set default values of certain system facilities. Changes are made by modifying files in the /etc/default directory.
A history of parameters that have changed or are now obsolete.
A history of this manual's revisions including the current Solaris release.

Other Resources for Solaris Tuning Information

This table describes other resources for Solaris tuning information.

Tuning Resource
For More Information
Online performance tuning information
In-depth technical white papers

Documentation, Support, and Training

See the following web sites for additional resources:

Oracle Software Resources

Oracle Technology Network offers a range of resources related to Oracle software:

Typographic Conventions

The following table describes the typographic conventions that are used in this book.

Table P-1 Typographic Conventions

The names of commands, files, and directories, and onscreen computer output
Edit your .login file.

Use ls -a to list all files.

machine_name% you have mail.

What you type, contrasted with onscreen computer output
machine_name% su


Placeholder: replace with a real name or value
The command to remove a file is rm filename.
Book titles, new terms, and terms to be emphasized
Read Chapter 6 in the User's Guide.

A cache is a copy that is stored locally.

Do not save the file.

Note: Some emphasized items appear bold online.

Shell Prompts in Command Examples

The following table shows the default UNIX system prompt and superuser prompt for shells that are included in the Oracle Solaris OS. Note that the default system prompt that is displayed in command examples varies, depending on the Oracle Solaris release.

Table P-2 Shell Prompts

Bash shell, Korn shell, and Bourne shell
Bash shell, Korn shell, and Bourne shell for superuser
C shell
C shell for superuser