On Sat, Jan 7, 2017 at 8:58 AM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
On 01/07/2017 10:15 AM, Dušan Čolić wrote:
On Sat, Jan 7, 2017 at 12:05 AM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
On 01/07/2017 01:09 AM, Dušan Čolić wrote:
On Fri, Jan 6, 2017 at 8:58 PM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
On 01/06/2017 05:34 PM, Dušan Čolić wrote:
On Fri, Jan 6, 2017 at 2:44 PM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
On 12/26/2016 11:13 PM, Dušan Čolić wrote:
On Mon, Dec 26, 2016 at 7:47 PM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
On 12/25/2016 02:59 AM, Dušan Čolić wrote:
Fibration is a great way to decrease fragmentation and increase
throughput.
Currently there are 4 fibration plugins, lex, dot.o, ext_1 and
ext_3
and they all have their upsides and downsides.
Proposed fibration plugin combines them all so that it combines
files
with same extensions for 1, 2. 3 and 4 character extension in
groups
and sorts them in same fiber group.
With this fibration plugin all eg. xvid files would be in same
group
in folder on disk sorted alphabetically
What application wants all xvid files to be in the same group?
Do you have any benchmark numbers which show advantages
of the new plugin?
Xvid files are just an example.
ext_1234 fibration would be equal to sum of ext_1, ext_2, ext_3,
ext_4
and dot_o in one.
In currently default plugin (dot_o) we sort all files by name from
the
start except .o files which we put at the end.
So if we had a source directory with .c .h and .o files in it files
by
extension would be sorted like: chchchchchchchchoooooooooooooo
I presumed that in some use cases it is better to have files be
sorted
ccccccccccchhhhhhhhhhhhhhoooooooooooo
Hypothesis is to use the premise that files of same extension are in
same order of size to reduce fragmentation.
What kind of fragmentation you are talking about?
Internal (which results in "dead" disk space), or
external (which results in a lot of "extents")?
External
Edward.
If we group files of same extension in groups in one directory, when
we write files of same extension after deletion of some files of one
extension their group would be in same order as the deleted file so
they would be written in similar place and occupy the 'hole' of
similar size.
So "similar" means the same order, that is file sizes can differ in 2
times?
TBH, I don't see what can be deduced from this assumption ;)
It can happen that new file either doesn't fit to that hole, or
occupies
too
small place, so that next file won't fit to the rest of the hole..
OFC we can never guarantee that the new file completely fits the hole
(especially as we go through compression in next layer) but for both
smaller and larger file than a hole we would have higher probability
for less extents for situations with 2 or more types of files in a
directory. For one type of file in a directory behavior would be the
same as dot_o and ext_1 plugin.
I should upset you: fibration plugins are about mapping of a semantic
tree to the storage tree. Simply speaking, they manage mapping
object-> key, which has nothing common with real locations on diТак ты
уже не ищешь? sk.
This is a block allocator, who assigns disk addresses to nodes of the
storage tree (right before writing them to disk at flush time).
And I am sure that block allocator doesn't care about fibration groups.
I strongly not recommend you to experiment with block allocator.
Simply because I know how many people killed a lot of time without
results.
Then what is this comment in the beginning of kassign.c about:
* In reiser4 every piece of file system data and meta-data has a key. Keys
* are used to store information in and retrieve it from reiser4 internal
* tree. In addition to this, keys define _ordering_ of all file system
* information: things having close keys are placed into the same or
* neighboring (in the tree order) nodes of the tree. As our block
allocator
* tries to respect tree order (see flush.c), keys also define order in
which
* things are laid out on the disk, and hence, affect performance directly.
I can not find where in the code block allocator respects key ordering.
Once you find it, then let me know..
Let me prove it in a way that is possible for me without investing
years in learning R4 internals ;)
krshina3 test # mkfs.reiser4 -o create=reg40,fibration=ext_1_fibre /dev/md123
krshina3 test # ls -la /home/dusan/test/
total 261
drwxr-xr-x 2 root root 6 Jan 7 17:51 .
drwxr-xr-x 46 dusan dusan 73 Jan 7 17:48 ..
-rw-r--r-- 1 root root 4096 Jan 7 17:49 1.a
-rw-r--r-- 1 root root 8192 Jan 7 17:49 2.b
-rw-r--r-- 1 root root 12288 Jan 7 17:50 3.a
-rw-r--r-- 1 root root 16384 Jan 7 17:51 4.b
krshina3 test # mount /dev/md123 /mnt/test
krshina3 test # cp /home/dusan/test/* /mnt/test
krshina3 test # umount /dev/md123
krshina3 test # debugfs.reiser4 -t /dev/md123
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
NODE (25) LEVEL=2 ITEMS=11 SPACE=3562 MKFS ID=0x51a268e2 FLUSH=0x0
#0 NPTR (nodeptr40): [29:1(SD):0:2a:0] OFF=28, LEN=8, flags=0x0 [24]
------------------------------------------------------------------------------
#1 NPTR (nodeptr40): [2a:4(FB):c2312e6100000000:10000:c6e] OFF=36,
LEN=8, flags=0x0 [26]
------------------------------------------------------------------------------
#2 NPTR (nodeptr40): [2a:4(FB):c2332e6100000000:10002:c06] OFF=44,
LEN=8, flags=0x0 [27]
------------------------------------------------------------------------------
#3 NPTR (nodeptr40): [2a:4(FB):c2332e6100000000:10002:1bc4] OFF=52,
LEN=8, flags=0x0 [28]
------------------------------------------------------------------------------
#4 NPTR (nodeptr40): [2a:4(FB):c2332e6100000000:10002:2b82] OFF=60,
LEN=8, flags=0x0 [29]
------------------------------------------------------------------------------
#5 NPTR (nodeptr40): [2a:4(FB):c4322e6200000000:10001:b1a] OFF=68,
LEN=8, flags=0x0 [30]
------------------------------------------------------------------------------
#6 NPTR (nodeptr40): [2a:4(FB):c4322e6200000000:10001:1ad8] OFF=76,
LEN=8, flags=0x0 [31]
------------------------------------------------------------------------------
#7 NPTR (nodeptr40): [2a:4(FB):c4342e6200000000:10003:a70] OFF=84,
LEN=8, flags=0x0 [32]
------------------------------------------------------------------------------
#8 NPTR (nodeptr40): [2a:4(FB):c4342e6200000000:10003:1a2e] OFF=92,
LEN=8, flags=0x0 [33]
------------------------------------------------------------------------------
#9 NPTR (nodeptr40): [2a:4(FB):c4342e6200000000:10003:29ec] OFF=100,
LEN=8, flags=0x0 [34]
------------------------------------------------------------------------------
#10 NPTR (nodeptr40): [2a:4(FB):c4342e6200000000:10003:39aa] OFF=108,
LEN=8, flags=0x0 [35]
==============================================================================
NODE (24) LEVEL=1 ITEMS=7 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 SD (stat40): [29:1(SD):0:2a:0] OFF=28, LEN=94, flags=0x0
exts: 3
mask: 0x13
plugin: sdext_lw
offset: 2
len: 14
mode: drwxr-xr-x
nlink: 3
size: 6
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 17:59:37 2017
mtime: Sat Jan 7 18:03:59 2017
ctime: Sat Jan 7 18:03:59 2017
rdev: 300
bytes: 300
plugin: sdext_plugin_set
offset: 44
len: 50
Pset count: 12
permission : id = 0
formatting : id = 2 (smart)
hash : id = 1 (r5_hash)
fibration : id = 2 (ext_1_fibre)
statdata : id = 0 (stat40)
diritem : id = 2 (cde40)
crypto : id = 0
digest : id = 0
compress : id = 0 (lzo1)
compressMode : id = 4 (conv)
cluster : id = 0 (64K)
create : id = 0 (reg40)
------------------------------------------------------------------------------
#1 DIRITEM (cde40): [2a:0(NAME):0:0:0] OFF=122, LEN=302, flags=0x0
NR(6) NAME OFFSET HASH
SDKEY
0 . 158
0000000000000000:0000000000000000 0000291:000002a
1 .. 182
0000000000000000:0000000000000000 0000291:000002a
2 1.a 206
0000000000000000:0000000000000000 00002a1:0010000
3 3.a 230
0000000000000000:0000000000000000 00002a1:0010002
4 2.b 254
0000000000000000:0000000000000000 00002a1:0010001
5 4.b 278
0000000000000000:0000000000000000 00002a1:0010003
------------------------------------------------------------------------------
#2 SD (stat40): [2a:1(SD):c2312e6100000000:10000:0] OFF=424, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 4096
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:03:59 2017
mtime: Sat Jan 7 18:03:59 2017
ctime: Sat Jan 7 18:03:59 2017
rdev: 4096
bytes: 4096
plugin: sdext_lt
offset: 44
len: 12
atime: 652286102
mtime: 652286102
ctime: 652286102
------------------------------------------------------------------------------
#3 SD (stat40): [2a:1(SD):c2332e6100000000:10002:0] OFF=480, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 12288
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:03:59 2017
mtime: Sat Jan 7 18:03:59 2017
ctime: Sat Jan 7 18:03:59 2017
rdev: 12288
bytes: 12288
plugin: sdext_lt
offset: 44
len: 12
atime: 656286256
mtime: 656286256
ctime: 656286256
------------------------------------------------------------------------------
#4 SD (stat40): [2a:1(SD):c4322e6200000000:10001:0] OFF=536, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 8192
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:03:59 2017
mtime: Sat Jan 7 18:03:59 2017
ctime: Sat Jan 7 18:03:59 2017
rdev: 8192
bytes: 8192
plugin: sdext_lt
offset: 44
len: 12
atime: 652286102
mtime: 656286256
ctime: 656286256
------------------------------------------------------------------------------
#5 SD (stat40): [2a:1(SD):c4342e6200000000:10003:0] OFF=592, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 16384
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:03:59 2017
mtime: Sat Jan 7 18:03:59 2017
ctime: Sat Jan 7 18:03:59 2017
rdev: 16384
bytes: 16384
plugin: sdext_lt
offset: 44
len: 12
atime: 656286256
mtime: 656286256
ctime: 656286256
------------------------------------------------------------------------------
#6 TAIL (plain40): [2a:4(FB):c2312e6100000000:10000:0] OFF=648,
LEN=3182, flags=0x0
==============================================================================
NODE (26) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c2312e6100000000:10000:c6e] OFF=28,
LEN=914, flags=0x0
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):c2332e6100000000:10002:0] OFF=942,
LEN=3078, flags=0x0
==============================================================================
NODE (27) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c2332e6100000000:10002:c06] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (28) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c2332e6100000000:10002:1bc4] OFF=28,
LEN=4030, flags=0x50
==============================================================================
NODE (29) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c2332e6100000000:10002:2b82] OFF=28,
LEN=1150, flags=0x54
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):c4322e6200000000:10001:0] OFF=1178,
LEN=2842, flags=0x0
==============================================================================
NODE (30) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4322e6200000000:10001:b1a] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (31) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4322e6200000000:10001:1ad8] OFF=28,
LEN=1320, flags=0x0
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):c4342e6200000000:10003:0] OFF=1348,
LEN=2672, flags=0x0
==============================================================================
NODE (32) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4342e6200000000:10003:a70] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (33) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4342e6200000000:10003:1a2e] OFF=28,
LEN=4030, flags=0x63
==============================================================================
NODE (34) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4342e6200000000:10003:29ec] OFF=28,
LEN=4030, flags=0xbf
==============================================================================
NODE (35) LEVEL=1 ITEMS=1 SPACE=2408 MKFS ID=0x51a268e2 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):c4342e6200000000:10003:39aa] OFF=28,
LEN=1622, flags=0x1b7
==============================================================================
krshina3 test # mkfs.reiser4 -o create=reg40,fibration=dot_o_fibre /dev/md123
krshina3 test # mount /dev/md123 /mnt/test
krshina3 test # cp /home/dusan/test/* /mnt/test
krshina3 test # umount /dev/md123
krshina3 test # debugfs.reiser4 -t /dev/md123
debugfs.reiser4 1.1.0
Format release: 4.0.1
Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
NODE (25) LEVEL=2 ITEMS=11 SPACE=3562 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 NPTR (nodeptr40): [29:1(SD):0:2a:0] OFF=28, LEN=8, flags=0x0 [24]
------------------------------------------------------------------------------
#1 NPTR (nodeptr40): [2a:4(FB):312e6100000000:10000:c6e] OFF=36,
LEN=8, flags=0x0 [26]
------------------------------------------------------------------------------
#2 NPTR (nodeptr40): [2a:4(FB):322e6200000000:10001:c06] OFF=44,
LEN=8, flags=0x0 [27]
------------------------------------------------------------------------------
#3 NPTR (nodeptr40): [2a:4(FB):322e6200000000:10001:1bc4] OFF=52,
LEN=8, flags=0x0 [28]
------------------------------------------------------------------------------
#4 NPTR (nodeptr40): [2a:4(FB):332e6100000000:10002:b5c] OFF=60,
LEN=8, flags=0x0 [29]
------------------------------------------------------------------------------
#5 NPTR (nodeptr40): [2a:4(FB):332e6100000000:10002:1b1a] OFF=68,
LEN=8, flags=0x0 [30]
------------------------------------------------------------------------------
#6 NPTR (nodeptr40): [2a:4(FB):332e6100000000:10002:2ad8] OFF=76,
LEN=8, flags=0x0 [31]
------------------------------------------------------------------------------
#7 NPTR (nodeptr40): [2a:4(FB):342e6200000000:10003:a70] OFF=84,
LEN=8, flags=0x0 [32]
------------------------------------------------------------------------------
#8 NPTR (nodeptr40): [2a:4(FB):342e6200000000:10003:1a2e] OFF=92,
LEN=8, flags=0x0 [33]
------------------------------------------------------------------------------
#9 NPTR (nodeptr40): [2a:4(FB):342e6200000000:10003:29ec] OFF=100,
LEN=8, flags=0x0 [34]
------------------------------------------------------------------------------
#10 NPTR (nodeptr40): [2a:4(FB):342e6200000000:10003:39aa] OFF=108,
LEN=8, flags=0x0 [35]
==============================================================================
NODE (24) LEVEL=1 ITEMS=7 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 SD (stat40): [29:1(SD):0:2a:0] OFF=28, LEN=94, flags=0x0
exts: 3
mask: 0x13
plugin: sdext_lw
offset: 2
len: 14
mode: drwxr-xr-x
nlink: 3
size: 6
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:05:26 2017
mtime: Sat Jan 7 18:06:31 2017
ctime: Sat Jan 7 18:06:31 2017
rdev: 300
bytes: 300
plugin: sdext_plugin_set
offset: 44
len: 50
Pset count: 12
permission : id = 0
formatting : id = 2 (smart)
hash : id = 1 (r5_hash)
fibration : id = 1 (dot_o_fibre)
statdata : id = 0 (stat40)
diritem : id = 2 (cde40)
crypto : id = 0
digest : id = 0
compress : id = 0 (lzo1)
compressMode : id = 4 (conv)
cluster : id = 0 (64K)
create : id = 0 (reg40)
------------------------------------------------------------------------------
#1 DIRITEM (cde40): [2a:0(NAME):0:0:0] OFF=122, LEN=302, flags=0x0
NR(6) NAME OFFSET HASH
SDKEY
0 . 158
0000000000000000:0000000000000000 0000291:000002a
1 .. 182
0000000000000000:0000000000000000 0000291:000002a
2 1.a 206
0000000000000000:0000000000000000 00002a1:0010000
3 2.b 230
0000000000000000:0000000000000000 00002a1:0010001
4 3.a 254
0000000000000000:0000000000000000 00002a1:0010002
5 4.b 278
0000000000000000:0000000000000000 00002a1:0010003
------------------------------------------------------------------------------
#2 SD (stat40): [2a:1(SD):312e6100000000:10000:0] OFF=424, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 4096
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:06:31 2017
mtime: Sat Jan 7 18:06:31 2017
ctime: Sat Jan 7 18:06:31 2017
rdev: 4096
bytes: 4096
plugin: sdext_lt
offset: 44
len: 12
atime: 778212799
mtime: 778212799
ctime: 778212799
------------------------------------------------------------------------------
#3 SD (stat40): [2a:1(SD):322e6200000000:10001:0] OFF=480, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 8192
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:06:31 2017
mtime: Sat Jan 7 18:06:31 2017
ctime: Sat Jan 7 18:06:31 2017
rdev: 8192
bytes: 8192
plugin: sdext_lt
offset: 44
len: 12
atime: 778212799
mtime: 778212799
ctime: 778212799
------------------------------------------------------------------------------
#4 SD (stat40): [2a:1(SD):332e6100000000:10002:0] OFF=536, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 12288
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:06:31 2017
mtime: Sat Jan 7 18:06:31 2017
ctime: Sat Jan 7 18:06:31 2017
rdev: 12288
bytes: 12288
plugin: sdext_lt
offset: 44
len: 12
atime: 782212955
mtime: 782212955
ctime: 782212955
------------------------------------------------------------------------------
#5 SD (stat40): [2a:1(SD):342e6200000000:10003:0] OFF=592, LEN=56, flags=0x0
exts: 3
mask: 0x7
plugin: sdext_lw
offset: 2
len: 14
mode: -rw-r--r--
nlink: 1
size: 16384
plugin: sdext_unix
offset: 16
len: 28
uid: 0
gid: 0
atime: Sat Jan 7 18:06:31 2017
mtime: Sat Jan 7 18:06:31 2017
ctime: Sat Jan 7 18:06:31 2017
rdev: 16384
bytes: 16384
plugin: sdext_lt
offset: 44
len: 12
atime: 782212955
mtime: 782212955
ctime: 782212955
------------------------------------------------------------------------------
#6 TAIL (plain40): [2a:4(FB):312e6100000000:10000:0] OFF=648,
LEN=3182, flags=0x0
==============================================================================
NODE (26) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):312e6100000000:10000:c6e] OFF=28,
LEN=914, flags=0x0
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):322e6200000000:10001:0] OFF=942,
LEN=3078, flags=0x0
==============================================================================
NODE (27) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):322e6200000000:10001:c06] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (28) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):322e6200000000:10001:1bc4] OFF=28,
LEN=1084, flags=0x0
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):332e6100000000:10002:0] OFF=1112,
LEN=2908, flags=0x0
==============================================================================
NODE (29) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):332e6100000000:10002:b5c] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (30) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):332e6100000000:10002:1b1a] OFF=28,
LEN=4030, flags=0xc
==============================================================================
NODE (31) LEVEL=1 ITEMS=2 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):332e6100000000:10002:2ad8] OFF=28,
LEN=1320, flags=0x1cf
------------------------------------------------------------------------------
#1 TAIL (plain40): [2a:4(FB):342e6200000000:10003:0] OFF=1348,
LEN=2672, flags=0x0
==============================================================================
NODE (32) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):342e6200000000:10003:a70] OFF=28,
LEN=4030, flags=0x0
==============================================================================
NODE (33) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):342e6200000000:10003:1a2e] OFF=28,
LEN=4030, flags=0x21
==============================================================================
NODE (34) LEVEL=1 ITEMS=1 SPACE=0 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):342e6200000000:10003:29ec] OFF=28,
LEN=4030, flags=0x1cf
==============================================================================
NODE (35) LEVEL=1 ITEMS=1 SPACE=2408 MKFS ID=0x1bb9bd27 FLUSH=0x0
#0 TAIL (plain40): [2a:4(FB):342e6200000000:10003:39aa] OFF=28,
LEN=1622, flags=0x16
==============================================================================
As we can see with ext_1_fibre files were sorted:
1.a
3.a
2.b
4.b
With dot_o_fibre:
1.a
2.b
3.a
4.b
