chanq_hash_locks(5)                                     chanq_hash_locks(5)
                          Tunable Kernel Parameters



 NAME    [Toc]    [Back]
      chanq_hash_locks - size of hashed pool of spinlocks protecting the
      channel queue hash tables

 VALUES    [Toc]    [Back]
    Failsafe
      256

    Default    [Toc]    [Back]
      256

    Allowed values    [Toc]    [Back]
      Any value between 16 and 16777216 that is a power of two.

    Recommended values    [Toc]    [Back]
      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    [Toc]    [Back]
      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    [Toc]    [Back]
      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    [Toc]    [Back]
      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.





 Hewlett-Packard Company            - 1 -      HP-UX 11i Version 2: Sep 2004






 chanq_hash_locks(5)                                     chanq_hash_locks(5)
                          Tunable Kernel Parameters



      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    [Toc]    [Back]
      chanq_hash_locks was developed by HP.


 Hewlett-Packard Company            - 2 -      HP-UX 11i Version 2: Sep 2004