I really hated these patches. The issue that was causing >90% of the problems we encountered was that pci_alloc_consistent was overextending when no_iommu was set by ignoring the dma masks of the adapter and forcing the use of the dma map pool when it wasn't necessary. IMHO, fixing this issue seems like a much better approach than having to make the dma pool or swiotlb larger. -- james s > -----Original Message----- > From: linux-scsi-owner@xxxxxxxxxxxxxxx > [mailto:linux-scsi-owner@xxxxxxxxxxxxxxx]On Behalf Of Matt Domsch > Sent: Monday, July 11, 2005 9:55 AM > To: Salyzyn, Mark > Cc: Kit Gerrits; linux-poweredge@xxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx > Subject: Re: PE1800 S-ATA RAID CERC6 with RHEL 3 / 4 ??? > > > 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. > > Thanks, > Matt > > -- > Matt Domsch > Software Architect > Dell Linux Solutions linux.dell.com & www.dell.com/linux > Linux on Dell mailing lists @ http://lists.us.dell.com > - > : send the line "unsubscribe > linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
