PE1800 S-ATA RAID CERC6 with RHEL 3 / 4 ???

Matt Domsch Matt_Domsch at
Mon Jul 11 08:54:45 CDT 2005

On Mon, Jul 11, 2005 at 08:02:47AM -0400, Salyzyn, Mark wrote:
> One of the problems with this class (2.4.* based 64 bit) is the Software
> IOMMU. You may have to boot with 'swiotlb=12288' in order to free enough
> mapping resources for the card.

And if you're running RHEL3 Update 5 or higher, the swiotlb no longer
is mapped into ZONE_DMA space, so you can safely make it larger (as
Mark describes above) without depleating the 16MB ZONE_DMA.


Matt Domsch
Software Architect
Dell Linux Solutions &
Linux on Dell mailing lists @

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