On Fri, Dec 16, 2011 at 10:47:39PM +0100, James Bottomley wrote: > Well, no, what you want to do is use a shared tag map at the block > level. That will manage a joint tag space for N queues without your > having to partition it arbitrarily. see scsi_host_find_tag() and > scsi_init_shared_tag_map(). By the way, the same verbiage about tags being shared across LUNs is also present in the SAS spec (and various other specs last time I looked, which wasn't recently). We should probably make this the default in the SCSI core. I suspect it hasn't bitten us because there are so few multi-LUN devices out there, and it's only a "May" check, not "Must" check. But Linux is technically in violation of the SAS spec by sending two commands to the same target with the same tag. -- 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
