On Wed, 2007-01-10 at 15:07 -0800, john clyne wrote: > So given that the HBA max_sectors_kb looks sufficiently large, my > interpretation of your article is the next place I need to look is at > ajusting SCSI_MAX_PHYS_SEGMENTS. Sounds like i can only increase this to > 256. Does that than give me a max transfer size of 256 * page_size (4k) = > 1MB? Is 1MB the limit or am I missing something? Well ... that's not the maximum possible ... just the maximum number of SG elements. If the buffer is completely fragmented in physical memory, then it will be 1MB ... however, linux does a reasonable job of getting physically contiguous pages into a large memory allocation, so you could get transfers that are larger than the 1MB limit by quite a way. And, of course, any system that has a larger page size or uses an iommu will go over this 1MB as well. Jmaes - 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
