dma32_pool_size.5 (2010 09)

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dma32_pool_size(5)
Itanium(R)-based System Only
dma32_pool_size(5)
(Tunable Kernel Parameters)
NAME
dma32_pool_size - the amount of memory to reserve for the 32-bit DMA pool
VALUES
Minimum
0
Maximum
4GB
Default
256MB
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 parame-
ter 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://www.hp.com/go/hpux-core-docs
.
AUTHOR
dma32_pool_size was developed by HP.
SEE ALSO
kctune(1M).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1