On Tue, Jun 10, 2008 at 09:05:34AM -0500, Eric Sandeen wrote: > Barriers do have performance impact, which is probably historically why > they're off by default on ext3. I'm not totally convinced that it's a The cost is dropping rapidly with SATA devices. With a modern SATA disk and NCQ we really really want them on - you've got 31 commands in flight and 16MB or so of drive cache that will be written back in *arbitary* order. Thats a recipe for disaster. A few years ago with one command at a time wind up disks and at most 2MB it wasn't so bad. It really should be getting set on by either our kernel or the installer in the SATA cases. Alan -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
