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NSTREVENT(5)							  NSTREVENT(5)

NAME
       NSTREVENT - maximum number of outstanding STREAMS bufcalls

VALUES
   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION
       This  tunable limits the maximum number of outstanding that are allowed
       to exist in the system at any given time.

       This tunable is intended to protect the system against  resource	 over‐
       load  caused by the combination of modules running in all streams issu‐
       ing an excessive number of The value selected should  be	 equal	to  or
       greater	than  the  combined  maximum  number of that can be reasonably
       expected during normal operation from all streams on the	 system.   are
       used by STREAMS modules in low memory situations.

   Who Is Expected to Change This Tunable?
       Any customer.

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

   When Should the Value of This Tunable Be Raised?
       When the system has a lot of low memory situations.

   What Are the Side Effects of Raising the Value of This Tunable?
       If  too big a number is chosen, the STREAMS subsystem preallocates more
       memory for internal data structures than may be needed.	 This  reduces
       the amount of  memory available to applications and the system.

   When Should the Value of This Tunable Be Lowered?
       If  the	tunable	 is  increased for a particular STREAMS module/driver,
       this tunable can be lowered when that STREAMS module/driver is removed.
       It should be returned to its previous value.  However, HP does not rec‐
       ommend a value lower than the default value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       During low memory situations, it will bring down system performance.

   What Other Tunable Should Be Changed at the Same Time as This One?
       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		  NSTREVENT(5)

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