From linux-kernel Mon Oct 25 12:21:29 2004 From: Karl Vogel Date: Mon, 25 Oct 2004 12:21:29 +0000 To: linux-kernel Subject: ext3 reservation strangeness?! Message-Id: <6DED3619289CD311BCEB00508B8E133601A68E80 () nt-server2 ! antwerp ! seagha ! com> X-MARC-Message: https://marc.info/?l=linux-kernel&m=109870704128148 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/