Matthew Wilcox wrote: > I've spoken with a few Linux filesystem people. They find it > significantly easier to send a single LBA/length pair at a time. > Modern filesystems try quite hard to keep fragmentation to a minimum, so > they don't expect a performance hit from sending multiple commands. > They're non-blocking writes, and the IO elevators can take care of > sending more important reads first. Perhaps there are occasions when it's more efficient for the disk to process several LBA/length pairs in a single operation? I.e. you send the first pair, the disk starts working, then you send the second, and that's not as efficient as doing both at the same time, which might translate to a single commit on SSD. The general solution to that would be a 'CORK' operation, though, similar to TCP_CORK: this operation will be followed by others, you may start it now, but don't rush... -- Jamie -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
