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Full Discussion: Redhat 2.1 AS Memory Limit?
Operating Systems Linux Ubuntu Redhat 2.1 AS Memory Limit? Post 302250876 by jim mcnamara on Friday 24th of October 2008 01:19:14 PM
Old 10-24-2008
Hmm...

Nobody has answered - so take this with a grain of salt. I have vague memories of compiling a RH 2.1 AS kernel with a "bigmem" switch set on to allow the use of more than 4GB.

So, yes, without playing compile-the-kernel, going beyond 4GB is potentially a waste.
 

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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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