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tcphashsz

tcphashsz(5)							File Formats Manual						      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
       specified 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 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 tun-
       able values, 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)