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)