Eric Sandeen wrote: > running fs_mark like this: > > fs_mark -d /mnt/test -D 256 -n 100000 -t 4 -s 20480 -F -S 0 > > (256 subdirs, 100000 files/iteration, 4 threads, 20k files, no sync) > > on a 1T fs, with and without delalloc (mount option), is pretty interesting: > > http://people.redhat.com/esandeen/ext4/fs_mark.png I've updated this graph with another run where the group_prealloc tuneable was set to a perfect multiple of the allocation size, or 500 blocks. This way the leftover 2-block preallocations don't wind up causing the list to grow with unuseable tiny leftover preallocations. After tuning this way, it does clearly seem to be the problem here. -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
