NAME
STRCTLSZ — maximum size of streams message control (bytes)
VALUES
Allowed values
0 - 2147483647
DESCRIPTION
STRCTLSZ
limits the maximum number of bytes of control data that can be
inserted by
putmsg()
in the control portion of any streams message on the
system. If the tunable is set to zero, there is no limit on how many
bytes can be placed in the control segment of the message.
putmsg()
returns
ERANGE
if the buffer being sent is larger than the current
value of
STRCTLSZ.
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 more bytes
in the control portion of any streams message 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 control 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 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://docs.hp.com.
AUTHOR
STRCTLSZ
was developed by HP.
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