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Full Discussion: Redhat 2.1 AS Memory Limit?
Operating Systems Linux Ubuntu Redhat 2.1 AS Memory Limit? Post 302252717 by Cbish68 on Thursday 30th of October 2008 07:25:52 AM
Old 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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STRCTLSZ(5)							File Formats Manual						       STRCTLSZ(5)

NAME
STRCTLSZ - maximum size of streams message control (bytes) VALUES
Failsafe Default Allowed values Recommended values DESCRIPTION
limits the maximum number of bytes of control data that can be inserted by 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. returns if the buffer being sent is larger than the current value of 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 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 STRCTLSZ(5)
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