nstrpush.5 (2010 09)

NSTRPUSH(5) NSTRPUSH(5)

(Tunable Kernel Parameters)

NAME

NSTRPUSH - maximum number of STREAMS modules in a single stream

VALUES

Failsafe

Default

Allowed values

0 - 2147483647

Recommended values

DESCRIPTION

This tunable deﬁnes the maximum number of STREAMS modules that can be pushed onto a stream. This

provides some protection against run-away processes that might automatically select modules to push

onto a stream. It is not intended as a defense against malicious use of STREAMS modules by system

users.

Most systems do not require more than about three or four modules in a stream. However, there may be

some unusual cases where more modules are needed. The default value for this tunable allows as many

as 16 modules in a stream, which should be sufﬁcient for even the most demanding installations and

applications.

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 customer needs to push more STREAMS modules in a single stream.

What Are the Side Effects of Raising the Value of This Tunable?

Might allow run-away applications to unduly consume system resources.

When Should the Value of This Tunable Be Lowered?

There is no need to lower the tunable value from the default value.

What Are the Side Effects of Lowering the Value of This Tunable?

Too low of a value might cause network commands to fail.

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 parame-

ter values. After installation, some tunable parameters may no longer be at the default or recommended

values. For information about the effects of installation on tunable values, consult the documentation for

the kernel software being installed. For information about optional kernel software that was factory

installed on your system, see HP-UX Release Notes at

http://www.hp.com/go/hpux-core-docs.

AUTHOR

NSTRPUSH was developed by HP.

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NSTRPUSH(5) NSTRPUSH(5) (Tunable Kernel Parameters) NAME NSTRPUSH - maximum number of STREAMS modules in a single stream VALUES Failsafe 16 Default 16 Allowed values 0 - 2147483647 Recommended values 16 DESCRIPTION This tunable defines the maximum number of STREAMS modules that can be pushed onto a stream. This provides some protection against run-away processes that might automatically select modules to push onto a stream.
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(Notes) A (Notes) nA 2 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010