01-08-2009
try using the hugemem kernel
I believe starting the RHEL3 RedHat offers a hugemem kernel supports a 4GB per process user space and a 4GB direct kernel space. The hugemem kernel allows systems with up to 64GB of main memory and is required in order to use all the memory in system configured with more than 16GB of memory.
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LEARN ABOUT HPUX
dma32_pool_size
dma32_pool_size(5) File Formats Manual dma32_pool_size(5)
NAME
dma32_pool_size - the amount of memory to reserve for the 32-bit DMA pool
VALUES
Minimum
Maximum
Default
Specify an integer value.
DESCRIPTION
This tunable specifies the amount of memory in the first 4GB of the physical address space to be reserved for DMA for 32-bit cards. The
memory is set aside at boot time and cannot be used for other purposes. This is required only on some Itanium platforms. On platforms
where the 32-bit pool is not needed, this value is ignored.
The value of this tunable should be set based on the number of 32-bit cards in the system and the type of cards.
Related Parameters
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.
SEE ALSO
None
Itanium(R)-based System Only Tunable Kernel Parameters dma32_pool_size(5)