Hi everybody, [Resent without big dmesg attachment which vger doesn't seem to like, lots of excuses if you get it twice] I'm using Btrfs as my root filesystem since November 2011 on openSUSE 12.1. It started on openSUSE's 3.1 kernel, then I stared compiling the kernel myself and went through 3.2, 3.3 and 3.4. Since the beginning I had noatime,compress=lzo as mount options. Over time I've added some more so now I'm using: noatime,space_cache,inode_cache,autodefrag,compress=lzo. Mount has always been slow, around or more than 10 seconds. Initially I thought it's just the way things are and Btrfs is slow when mounting but then I saw [1] where Calvin Watson says his Btrfs mounts in 0.5 seconds. I want that as well :). My dmesg after hitting Alt-Sysrq-w a few times while waiting for the mount command from the initrd on kernel 3.4.0 is at: https://gist.github.com/2838536 It starts mounting at 3.490979 and the next kernel message is at 19.506051. openSUSE has snapper which takes snapshots every hour therefore there were quite some snapshots made on this filesystem during its lifetime. Some more data: catalin@linux-vo6z:~/btrfs-progs> sudo ./btrfs fi df / Data: total=169.01GB, used=107.23GB System, DUP: total=8.00MB, used=28.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=7.12GB, used=3.77GB Metadata: total=8.00MB, used=0.00 catalin@linux-vo6z:~/btrfs-progs> sudo ./btrfs fi show root's password: failed to read /dev/sr0 Label: none uuid: 440b735b-1171-4dd3-a058-d88c89325391 Total devices 1 FS bytes used 111.00GB devid 1 size 251.47GB used 183.29GB path /dev/sda8 Btrfs Btrfs v0.19 I can test whatever patches you provide or give more information if needed. Thanks, Catalin [1] http://permalink.gmane.org/gmane.comp.file-systems.btrfs/16697 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
