HP-UX Reference (11i v2 03/08) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

dma32_pool_size(5)

Itanium-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

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.

AUTHOR

dma32_pool_size was developed by HP.