10-30-2008
Here's the official answer that I received from Redhat Support:
Quote:
RHEL2.1 with normal/smp kernel support up to 4G of memory, if you would like to increase the memory beyond 4G you should use enterprise kernel (ie, kernel-enterprise). With enterprise kernel you will be able to utilize memory upto 16G.
To install enterprise kernel, please execute the following,
# up2date kernel-enterprise
Reboot the machine with new (enterprise) kernel.
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LEARN ABOUT HPUX
strmsgsz
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)