On Fri, Mar 6, 2009 at 6:38 AM, <scameron@xxxxxxxxxxxxxxxxxxxxxxx> wrote: ... > The command buffers have to be in the first 4GB of memory, as the command > register is only 32 bits, so they are allocated by pci_alloc_consistent. Huh?!! ISTR the mpt2sas driver is indicating it can handle 64-bit DMA masks for both streaming and control data. I need to double check to be sure of that. > However, the chained SG lists don't have that limitation, so I think they > can be kmalloc'ed, and so not chew up and unreasonable amount of the > pci_alloc_consistent memory and get a larger number of SGs. ...right? > Maybe that's the better way to do it. I thought the driver was tracking this and using the appropriate construct based on which DMA mask is in effect. hth, grant > -- steve > -- > To unsubscribe from this list: 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 > -- To unsubscribe from this list: 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
