Jeffrey W. Baker wrote: > On Thu, 2007-08-30 at 13:57 -0500, Eric Sandeen wrote: >> barrier seems to hurt badly on xfs, too. Note: barrier is off by >> default on ext[34], so if you want apples to apples there, you need to >> change one or the other filesystem's mount options. If your write cache >> is safe (battery backed?) you may as well turn barriers off. I'm not >> sure offhand who will react more poorly to an evaporating write cache >> (with no barriers), ext4 or xfs... > > I didn't compare the safety of the three filesystems, Understood > but I did have > disk caches disabled Oh, so for the SW raid tests the individual disks had no write cache?f > and only battery-backed caches enabled. Do you > need barriers without volatile caches? As far as I understand it, then nope, you don't need it, and you're hurting performance with it. -Eric - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
