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nstrevent(5) [hpux man page]

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)

Check Out this Related Man Page

STRMSGSZ(5)							File Formats Manual						       STRMSGSZ(5)

NAME

       STRMSGSZ - maximum size of streams message data (bytes)

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This  tunable  limits the number of bytes of message data that can be inserted by or in the data portion of any streams message on the sys-
       tem.  If the tunable is set to zero, there is no limit on how many bytes can be placed in the data segment of the message.

       returns if the buffer being sent is larger than the current value of segments the data into multiple messages.

   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?
       The tunable should be increased by any customer if the customer's STREAMS module/driver(s) require a longer message size in the	data  por-
       tion than the current value.

   What Are the Side Effects of Raising the Value of This Tunable?
       The kernel will use more memory.  During low memory situations, it may bring down system performance due to frequent swapping.

   When Should the Value of This Tunable Be Lowered?
       The  tunable  could  be lowered by any customer if the customer's STREAMS module/driver(s) do not require a longer message size in the data
       portion than the current value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Possible improper functioning in any of the STREAMS module/driver(s).  Possible performance degradation, particularly in networking.

   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						       STRMSGSZ(5)
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