> From: [email protected] > Date: Tue, 15 Feb 2011 10:42:34 -0500 > > 00.21 versus 33.47? I'd really investigate hot/cold cache effects > there. If you "just" moved it to UFS, a copy is probably still in > cache. Any way to flush the in-memory file cache on your box and > try again?
there isn't but freebsd only has one buffer, inode, and metadata cache, it's not per-filesystem. and i ran those scans back to back, so if there are caching effects going on then the second and third scans ought to be equally fast for the two file systems. it may be that rather than a fragmentation problem there's a VFS flagging problem where ZFS is advising the buffer cache not to keep copies of the metadata. either way i'm going to take a look at geom/gvinum. i don't mind a write penalty for raid6/raidz2 but a read penalty of this many orders of magnitude is just too whacky. _______________________________________________ Nmh-workers mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/nmh-workers
