|HP-UX Reference > A
Tunable Kernel Parameters
HP-UX 11i Version 3: February 2007
audit_memory_usage — percentage of physical memory that can be used by audit subsystem
The tunable audit_memory_usage defines the percentage of physical memory that can be used by audit records. If the audit record memory usage exceeds the audit_memory_usage limit, the audit subsystem blocks the system call until memory usage comes down inside the limit.
Who Is Expected to Change This Tunable?
Administrator with proper privileges can change the value of audit_memory_usage.
Restrictions on Changing
This tunable value can be changed any time, as this is a dynamic tunable; but its value can not be lowered below the memory currently used by the audit subsystem for records.
When Should the Value of This Tunable Be Raised?
When the system to be audited is critical and generates many records.
What are the Side Effects of Raising the Value?
If the system is generating great number of records, and the value is raised, then it can create a lot of unflushed memory and might slow down the system.
When Should the Value of This Tunable Be Lowered?
When the audit subsystem is not generating many records.
What are the Side Effects of Lowering the Value?
If many audit records are generated, then the auditing subsystem might block the system call.
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tunable values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see HP-UX Release Notes at http://docs.hp.com.