From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kok, Auke-jan H" Subject: extremely slow syncing on btrfs with 2.6.39.1 Date: Sun, 10 Jul 2011 17:18:40 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: linux-btrfs@vger.kernel.org Return-path: List-ID: I've been monitoring the lists for a while now but didn't see this problem mentioned in particular: I've got a fairly standard desktop system at home, 700gb WD drive, nothing special, with 2 btrfs filesystems and some snapshots. The system runs for days, and I've noticed unusual disk activity the other evening - turns out that it's taking forever to sync(). $ uname -r 2.6.39.1 $ grep btrfs /proc/mounts /dev/root / btrfs rw,relatime 0 0 # is /dev/sdb2 # /dev/sdb5 /home btrfs rw,relatime 0 0 $ time sync real 1m5.552s user 0m0.000s sys 0m2.102s $ time sync real 1m16.830s user 0m0.001s sys 0m1.490s $ df -h / /home Filesystem Size Used Avail Use% Mounted on /dev/root 47G 33G 7.7G 82% / /dev/sdb5 652G 216G 421G 34% /home $ btrfs fi df / Data: total=35.48GB, used=29.86GB System, DUP: total=16.00MB, used=12.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=4.50GB, used=1.67GB $ btrfs fi df /home Data: total=310.01GB, used=209.53GB System, DUP: total=8.00MB, used=48.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=11.00GB, used=2.98GB Metadata: total=8.00MB, used=0.00 I'll switch to 3.0 soon, but, given the fact that we're going to be running MeeGo on 2.6.39 probably for a while, I was wondering if anyone knows off the top of their heads if this issue is known/identified. If not then I'll need to make someone do some patching ;). Auke