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tcphashsz(5)							  tcphashsz(5)

NAME
       tcphashsz - determines the size of the networking hash tables

VALUES
   Failsafe
   Default
   Allowed values
   Recommended values
       A  value	 of 0 (default) will adjust the in proportion to the number of
       cores in the system.  If is set to a non zero value, it should be spec‐
       ified  as  a  power  of two.  Otherwise, it will be rounded down to the
       nearest power of two.

DESCRIPTION
       This variable is used to set the size of the  networking	 hash  tables.
       HP  recommends  that  the  value	 of be set to 0 so that the system can
       choose an optimal value.	 A system that is going to have a large number
       of connections on it all of the time may see some benefit of increasing
       this value, beyond the number determined by the system.

       If this tunable is not set to zero, then it needs to be a power of two.
       If  it  is  not specified as a power of two, then it is rounded down to
       the nearest power of two.  If this tunable is set in the range of 1  to
       255, then it will be increased to 256.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       This  value  may be raised in the case of a machine with a large number
       of connections that last for an extended period of time.

   What Are the Side Effects of Raising the Value?
       More memory is used when this value is raised.

   When Should the Value of This Tunable Be Lowered?
       If a system is tight on memory and it has just a few connections on it,
       then lowering the value may reclaim some memory.

   What Are the Side Effects of Lowering the Value?
       If  is  set  too	 low, the system will have long hash chains which will
       slow it down.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  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  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

			   Tunable Kernel Parameters		  tcphashsz(5)

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