NSTREVENT(5)							File Formats Manual						      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 overload 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 recommend 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 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						      NSTREVENT(5)