search for: autodefrag

Kernel 3.1-rc8 btrfs-progs-0.19 mount options: noatime,autodefrag (space_cache is enabled) There are snapshots present on the filesystem. When I do a btrfs fi defrag on a file, the file becomes much more fragmented. The end result can be a file with 20k times more fragments than before. Initially I thought the extents were just smaller but were next to each othe...

Hi all, i am new on btrfs, i am testing KVM on btrfs (host: kernel x86-64 3.5.3), the performance is reasonable. I have two question on defrag, can someone help me? 1. According to btrfs wiki, defragment a COW file will produce two unrelated files. Does it apply to the "autodefrag" mount option? 2. Is there any command for the fragmentation status of a file/dir ? e.g. fragment size, number of fragments. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http:/...

Hi, I''ve been using btrfs for my root partition for about a month on archlinux and recently Ive started using the i3 window manager and starting X manually and I now boot to run level 3 (multi-user.target for systemd) and Ive noticed that booting archlinux on a btrfs root, there is a lot off hdd chatter after the login prompts are displayed, which doesnt happen with ext4 on root, so I

...ry/main/data/virtuosobackend> martin@merkaba:~/.kde/share/apps/nepomuk/repository/main/data/virtuosobackend> sudo filefrag soprano-virtuoso.db soprano-virtuoso.db: 15900 extents found Now I do not perceive any bottle neck so far and this is an SSD. What would be your recommendation: Add autodefrag to mount options or not? For now I am inclined to let it run that way and see how it goes. I am a bit reluctant about autodefrag cause of the additional writes it causes. Well, a direct dd of the file to memory is still quite fast: merkaba:/home/martin/.kde/share/apps/nepomuk/repository/main/da...

Hi, I have 4 machines, all converted to BTRFS about 6 months ago, now all running Ubuntu Quantal with kernel 3.5.0-17 The matter is that all these machines are now getting slower and slower everyday, every disk access causing the disk to be 100% busy for long periods, to the point that I''m now seriously considering migrating everything back to ext4... From the start BTRFS was "not

Hi list, I have a few large image files (VMware workstation VMDKs and TrueCrypt containers) which I routinely back up over the network to a btrfs raid10 volume via bigsync (https://code.google.com/p/bigsync/). The VM images in particular get really fragmented due to CoW, which is expected. I haven''t yet switched off CoW on the backups directory mainly to experiment and see what

...esktops this primarily affects application databases (including Firefox and Chromium profiles, GNOME Zeitgeist, Ubuntu Desktop Couch, Banshee, and Evolution''s datastore.) Workarounds include manually defragmenting your home directory using btrfs fi defragment. Auto-defragment (mount option autodefrag) should solve this problem in 3.0. Symptoms include btrfs-transacti and btrfs-endio-wri taking up a lot of CPU time (in spikes, possibly triggered by syncs). You can use filefrag to locate heavily fragmented files. Symptoms are: Very high load, btrfs-transacti, btrfs-endio-wri and other btfs kerne...

...s mounted with nodatacow. I''m using this as a workaround since subvolumes can''t be mounted with different options simultaneously. ie. one with COW, one with nodatacow Any ideas why the flags are being ignored? I''m running 32bit 3.3rc4 with noatime,nodatasum,space_cache,autodefrag,inode_cache on a 3 disk RAID0 data RAID1 metadata filesystem. Thanks, Kyle -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

...1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 629281c..8bd9d6d 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -197,7 +197,7 @@ static match_table_t tokens = { {Opt_subvolrootid, "subvolrootid=%d"}, {Opt_defrag, "autodefrag"}, {Opt_inode_cache, "inode_cache"}, - {Opt_no_space_cache, "no_space_cache"}, + {Opt_no_space_cache, "nospace_cache"}, {Opt_recovery, "recovery"}, {Opt_err, NULL}, }; @@ -711,7 +711,7 @@ static int btrfs_show_options(struct seq_file *seq, struct...

On 3.14.18 with a BTRFS partition mounted noatime,autodefrag,compress=lzo, I see the second assertion in btrfs_set_item_key_safe() trip: void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path, struct btrfs_key *new_key) { struct btrfs_disk_key disk_key; struct extent_buffer *eb; int...

What are the recommendations for running KVM images on BTRFS systems using kernel 3.4?  I saw older posts on the web complaining about poor performance, but I know a lot of work has gone into btrfs since then.  There also seemed to be the nocow option, but I didn''t find anything that said it actualy helped. Anybody have ideas? Thanks, Matt -- To unsubscribe from this list: send the line

We''re going to use this flag EXTENT_DEFRAG to indicate which range belongs to defragment so that we can implement snapshow-aware defrag: We set the EXTENT_DEFRAG flag when dirtying the extents that need defragmented, so later on writeback thread can differentiate between normal writeback and writeback started by defragmentation. This patch is used for the latter one. Originally patch

Hi, If i set strict allocate = yes in samba to speed up the transfer of a mssql database dump, then btrfs does not compress the file. I have tried it also by just copying a small file in Windows to the samba share and the same. I have tried btrfs mount options autodefrag and then btrfs fi defrag -c and the file still does not get compressed. I have tried kernels 3.6.11, 3.8 and 3.10.7 on FC16 and FC18. Any help, much appreciated. Thanks. Mark -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to major...

Provide for modification of the limit of compressed extent size utilizing mount-time configuration settings. The size of compressed extents was limited to 128K, which leads to fragmentation of the extents (although the extents themselves may still be located contiguously). This limit is put in place to ease the RAM required when spreading compression across several CPUs, and to make sure the

...0bf04a5a05995bf2d79300c btrfs: clean snapshots one by one The 068 test uses the scratch drive, so I believe xfs-test is using the defaults for formatting the device, which is a physical partition on my SATA drive. My mount settings for xfstests is: export MOUNT_OPTIONS="-o compress-force=lzo,autodefrag" There are no errors shown in dmesg. Here is the result of Alt-SysRq-W to show the blocked states: [ 413.408168] SysRq : Show Blocked State [ 413.409157] task PC stack pid father [ 413.409157] btrfs-cleaner D ffff88007827c308 0 4516 2 0x00000000 [...

In btrfs if we mount with "compress" we have no way to disable compressing by remounting (mount -o remount /mnt/btrfs), only by unmounting and mounting without "compress". This patch adds "nocompress" mount option which can be used to remount the filesystem without compression: # mount -o remount,nocompress /mnt/btrfs This option is usefull in cases when we have a

The new mount option is set after parsing the remount arguments, so it is wrong that checking the autodefrag is close or not at btrfs_remount_prepare(). Fix it. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> --- fs/btrfs/super.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 68a29a1..0f03569 100644 --- a/fs/btrfs/super.c +++...

...meone confirm that http://comments.gmane.org/gmane.comp.file-systems.btrfs/21256 is still the correct procedure to use to clear the cache. Still very happy with how well btrfs is working for me. Thank you. Al. PS: I think that there may be a problem with having a non-default boot subvol with autodefrag mount option but can''t consistently reproduce in haste. I''ve moved to the explicit subvol=@ in the kernel load and the eventual hang has gone. I have a ext based /boot but the remaining system is installed to a subvol to allow snapshots on it. Works fine (with above caveat) and i...

I am experiencing massive performance degradation on my BTRFS root partition on SSD. Except for regular daily updates, nothing changed in the system. The mount point remained the same: / btrfs rw,noatime,compress=lzo,ssd,space_cache,autodefrag 0 0 but the performance dropped to less than 8% of norm. Before: # dd if=tempfile of=/dev/null bs=1M count=1024 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 1.57307 s, 683 MB/s Now: # dd if=tempfile of=/dev/null bs=1M count=1024 1024+0 records in 1024+0 records out 1...

The reason the deadlock is that: Task Btrfs-cleaner umount() down_write(&s->s_umount) sync_filesystem() do auto-defragment and produce lots of dirty pages close_ctree() wait for the end of btrfs-cleaner start_transaction reserve space shrink_delalloc() writeback_inodes_sb_nr_if_idle()