Bruce Guenter wrote: > On Fri, Nov 14, 2008 at 09:59:14AM -0500, Theodore Tso wrote: >> This is beginning to perhaps sound like a layout problem of some kind. > > To test this theory, I ran one test where I populated the filesystem > with ext3 and then mounted as ext4 to do the unlinking. This produced > unlink times comparable with ext3. That is, the degredation is occuring > when the filesystem is populated, not when it is cleaned. Maybe run the unlinking activity through seekwatcher* in both cases, to see where the IO is happening. (also, you're right w.r.t. lvm/dm; barriers don't pass and should get disabled after the first attempt at a barrier write). -Eric *http://oss.oracle.com/~mason/seekwatcher/ (also packaged for fedora, maybe other distros as well) -- 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
