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(un)mounting takes a long time

DISCUSSION Florian Lindner 3 participants 3 messages Aug 11, 2013 – Aug 14, 2013 Btrfs file system

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Florian Lindner

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#0 lore raw

Hello!

I'm using ArchLinux with kernel Linux horus 3.10.5-1-ARCH #1 SMP PREEMPT. Mounting and unmounting takes a long time:

# time mount -v /mnt/Archiv         
mount: /dev/sde1 mounted on /mnt/Archiv.
mount -v /mnt/Archiv  0,00s user 0,16s system 1% cpu 9,493 total
# sync && time umount -v /mnt/Archiv
umount: /mnt/Archiv (/dev/sdd1) unmounted
umount -v /mnt/Archiv  0,00s user 0,33s system 1% cpu 23,247 total

fstab:

LABEL=Archiv /mnt/Archiv btrfs defaults,compress=zlib
0 0

Archiv is a RAID 0 comprised of two discs:

Label: 'Archiv' uuid: b2504193-efeb-4ef3-8797-a8d73536a416

        Total devices 2 FS bytes used 1.99TB
        devid    2 size 2.73TB used 1023.01GB path /dev/sde1
        devid    1 size 2.73TB used 1023.03GB path /dev/sdd1

Are un(mounting) times like these normal?

Regards,
Florian

#1 lore raw
Quoted 18 lines · Florian Lindner

Hello!

I'm using ArchLinux with kernel Linux horus 3.10.5-1-ARCH #1 SMP PREEMPT. Mounting and unmounting takes a long time:

# time mount -v /mnt/Archiv         
mount: /dev/sde1 mounted on /mnt/Archiv.
mount -v /mnt/Archiv  0,00s user 0,16s system 1% cpu 9,493 total
# sync && time umount -v /mnt/Archiv
umount: /mnt/Archiv (/dev/sdd1) unmounted
umount -v /mnt/Archiv  0,00s user 0,33s system 1% cpu 23,247 total

fstab:

LABEL=Archiv /mnt/Archiv btrfs defaults,compress=zlib
0 0

Quoted 8 lines

Archiv is a RAID 0 comprised of two discs:

Label: 'Archiv' uuid: b2504193-efeb-4ef3-8797-a8d73536a416

        Total devices 2 FS bytes used 1.99TB
        devid    2 size 2.73TB used 1023.01GB path /dev/sde1
        devid    1 size 2.73TB used 1023.03GB path /dev/sdd1

Are un(mounting) times like these normal?

Are you using -o space_cache? If not can you add that and mount/umount a couple of times to get the cache built up and see if that helps. If you are using space cache then sysrq+w while its taking forever to unmount and create a bugzilla at bugzilla.kernel.org (make sure the component is set to btrfs) so I can take a look at it. Thanks,

Josef

#2 lore raw

Am Montag, 12. August 2013, 09:50:16 schrieb Josef Bacik:

Quoted 23 lines · Florian Lindner
Quoted 22 lines

Hello!

I'm using ArchLinux with kernel Linux horus 3.10.5-1-ARCH #1 SMP PREEMPT. Mounting and unmounting takes a long time:

# time mount -v /mnt/Archiv
mount: /dev/sde1 mounted on /mnt/Archiv.
mount -v /mnt/Archiv  0,00s user 0,16s system 1% cpu 9,493 total
# sync && time umount -v /mnt/Archiv
umount: /mnt/Archiv (/dev/sdd1) unmounted
umount -v /mnt/Archiv  0,00s user 0,33s system 1% cpu 23,247 total

fstab:

LABEL=Archiv /mnt/Archiv btrfs
defaults,compress=zlib 0 0

Archiv is a RAID 0 comprised of two discs:

Label: 'Archiv' uuid: b2504193-efeb-4ef3-8797-a8d73536a416

Quoted 8 lines
Quoted 5 lines
        Total devices 2 FS bytes used 1.99TB
        devid    2 size 2.73TB used 1023.01GB path /dev/sde1
        devid    1 size 2.73TB used 1023.03GB path /dev/sdd1

Are un(mounting) times like these normal?

Are you using -o space_cache? If not can you add that and mount/umount a couple of times to get the cache built up and see if that helps.

Yes, I'm using space_cache (not explicitly, seems to be the default). I reboot my machine regularly, so there is frequent mount/unmount acitivity,

Quoted 4 lines

If you
are using space cache then sysrq+w while its taking forever to unmount and create a bugzilla at bugzilla.kernel.org (make sure the component is set to btrfs) so I can take a look at it. Thanks,

https://bugzilla.kernel.org/show_bug.cgi?id=60743

Thanks!
Florian