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chanq_hash_locks(5)

Tunable Kernel Parameters
HP-UX 11i Version 3: February 2007
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NAME

chanq_hash_locks — size of hashed pool of spinlocks protecting the channel queue hash tables

VALUES

Failsafe

256

Default

256

Allowed values

Any value between 16 and 16777216 that is a power of two.

Recommended values

Default value only.

HP does NOT recommend changing this tunable from the default value. Consult your HP Field Service engineer before changing this tunable.

DESCRIPTION

This tunable should NOT be changed. The default value is the best choice for optimal system performance.

This tunable controls the size of a pool of spinlocks (kernel data structures used for synchronization) that also protect channel queues. A very small value increases the probability of collisions in the channel queue hash tables and degrading performance. Very large values are unnecessary.

Who Is Expected to Change This Tunable?

HP does NOT recommend changing this tunable from the default value. Consult your HP Field Service engineer before changing this tunable.

Restrictions on Changing

This tunable should be a power of two. If another value is specified, the largest value (lower than the given value) that is a power of two is used.

What Are the Side Effects of Raising or Lowering the Value?

The performance of the system could deteriorate.

What Other Tunables Should Be Changed at the Same Time?

None.

WARNINGS

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.

AUTHOR

chanq_hash_locks was developed by HP.

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