On wed, 12 Dec 2012 23:26:02 -0500, Sylvain Alain wrote:> Hi guys, I noticed that now my snapshot take a long time to process :
>
> sylvain@gentootux ~ $ df -h
> Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
> rootfs 112G 4,0G 103G 4% /
> /dev/sda4 112G 4,0G 103G 4% /
> tmpfs 7,9G 596K 7,9G 1% /run
> udev 10M 0 10M 0% /dev
> none 7,9G 0 7,9G 0% /dev/shm
> cgroup_root 10M 0 10M 0% /sys/fs/cgroup
> tmpfs 12G 0 12G 0% /var/tmp/portage
> /dev/sdb2 224G 52G 173G 23% /mnt/win_c
> /dev/sdc2 912G 412G 500G 46% /mnt/win_d
>
> sylvain@gentootux ~ $ su -
> Mot de passe :
>
> gentootux ~ # mount /dev/sda4 -o
> noatime,ssd,discard,compress=lzo,noacl,space_cache,subvolid=0
> /mnt/disklayout/
>
> gentootux ~ # cd /mnt/disklayout/
>
> gentootux disklayout # ls
> @backup @racine
>
> gentootux disklayout # time btrfs subvolume delete @backup
> Delete subvolume ''/mnt/disklayout/@backup''
>
> real 0m0.020s
> user 0m0.001s
> sys 0m0.002s
> gentootux disklayout # ls
> @racine
>
> gentootux disklayout # time btrfs subvolume snapshot @racine @backup
> Create a snapshot of ''@racine'' in
''./@backup''
>
> real 6m9.122s
> user 0m0.000s
> sys 0m0.523s
>
> more then 6 minutes to snapshot 4 gigs of data, that''s twice
slower
> then kernel 3.6.
>
> Is there any log or something that I look after ?
>
> sylvain@gentootux ~ $ sudo dmesg | grep -i btrfs
> [ 0.371528] Btrfs loaded
> [ 0.784593] btrfs: disk space caching is enabled
> [ 0.788680] Btrfs detected SSD devices, enabling SSD mode
> [ 0.789757] VFS: Mounted root (btrfs filesystem) readonly on device
0:12.
> [ 4.881241] btrfs: use ssd allocation scheme
> [ 4.881244] btrfs: use lzo compression
> [ 4.881245] btrfs: disk space caching is enabled
> [ 496.982616] btrfs: unlinked 14 orphans
What kind of kernel did you use? mainline kernel?
Thanks
Miao
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