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Oracle Solaris Tunable Parameters Reference Manual     Oracle Solaris 11 Express 11/10
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Document Information

Preface

1.  Overview of Oracle Solaris System Tuning

What's New in Oracle Solaris System Tuning?

Tuning a Solaris System

Tuning Format of Tunable Parameters Descriptions

Tuning the Solaris Kernel

/etc/system File

Example--Setting a Parameter in /etc/system

Recovering From an Incorrect Value

kmdb Command

mdb Command

Example--Using mdb to Change a Value

Special Solaris tune and var Structures

Viewing Solaris System Configuration Information

sysdef Command

kstat Utility

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

Index

Special Solaris tune and var Structures

Solaris tunable parameters come in a variety of forms. The tune structure defined in the/usr/include/sys/tuneable.h file is the runtime representation of tune_t_fsflushr, tune_t_minarmem, and tune_t_flkrec. After the kernel is initialized, all references to these variables are found in the appropriate field of the tune structure.

Various documents (for example, previous versions of Solaris System Administration Guide, Volume 2) have stated that the proper way to set parameters in the tune structure is to use the syntax, tune:field-name where field-name is replaced by the actual parameter name listed above. This process silently fails. The proper way to set parameters for this structure at boot time is to initialize the special parameter that corresponds to the desired field name. The system initialization process then loads these values into the tune structure.

A second structure into which various tunable parameters are placed is the var structure named v. You can find the definition of a var structure in the /usr/include/sys/var.h file. The runtime representation of variables such as autoup and bufhwm is stored here.

Do not change either the tune or v structure on a running system. Changing any field in these structures on a running system might cause the system to panic.