When copying a file on 2.6.9-mm1 with the ext3 reservation code,
I noticed that there were a lot of fragments. Doing the same when
the filesystem is mounted with 'noreservation' seems to produce
better results?! Or am I interpreting this incorrectly?
Example:
[root@kvo kvo]# ls -l t
-rw-r--r-- 1 root root 8228490 Oct 23 14:45 t
Copying this file with reservation code active:
[root@kvo kvo]# mount -t ext3 -o commit=60,reservation /dev/sda1 /mnt
[root@kvo kvo]# cp t /mnt
[root@kvo kvo]# filefrag /mnt/t
/mnt/t: 129 extents found, perfection would be 1 extent
[root@kvo kvo]# rm -f /mnt/t
[root@kvo kvo]# umount /mnt
While doing the same with 'noreservation' produces only 2 extents:
[root@kvo kvo]# mount -t ext3 -o commit=60,noreservation /dev/sda1 /mnt
[root@kvo kvo]# cp t /mnt
[root@kvo kvo]# filefrag /mnt/t
/mnt/t: 2 extents found, perfection would be 1 extent
[root@kvo kvo]# rm -f /mnt/t
There was enough free diskspace available:
[root@kvo kvo]# df /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 76904352 25383252 47614496 35% /mnt