[this is a second post, the first post seemed to never reach the list]
Le 21.03.2006 22:16, Laurent Riffard a écrit :
> Hello,
>
> Writing big files is very slow on reiser4 now.
>
> "dd if=/dev/zero of=toto bs=1k count=102400; sync" takes more than 2 minutes
> on
> reiser4 fs, but only 15 seconds on reiserfs fs.
Oops! My tests were not fair: my reiser4 FS was almost full while my
reiserfs FS
had plenty of free space.
> kernel$ df .
> Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
> /dev/hda8 925M 825M 101M 90% /home/laurent/kernel
> kernel$ grep hda8 /proc/mounts
> /dev/hda8 /home/laurent/kernel reiser4
> rw,nosuid,nodev,atom_max_size=0x7e0c,atom_max_age=0x249f0,atom_min_size=0x100,atom_max_flushers=0x1,cbk_cache_slots=0x10
> 0 0
[snip]
> ~$ df .
> Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
> /dev/mapper/vglinux1-lvhome
> 7,0G 4,8G 2,3G 68% /home
> ~$ grep lvhome /proc/mounts
> /dev/vglinux1/lvhome /home reiserfs rw 0 0
So I did some tests with a 2GB logical volume. I formatted it
(reiserfs/ext2/reiser4fs), I untared a copy of a kernel tree on this FS
and I wrote a 100 MB file 3 times.
FS Elapsed time for dd + sync
reiserfs: 14.22s
ext2: 11.12s
reiser4: 19.71s
I won't discuss why reiser4 is slow here. Maybe my tests are not so
good. The
interesting point of this thread is that reiser4 seems not to like
the situations
with little space available. I should replay these tests with 90%
full FS (but it's
time to go to bed now...).
Below is attached the full logs of my tests.
~~
laurent
Le script a débuté sur mar 21 mar 2006 22:40:11 CET
[EMAIL PROTECTED] ~]# lvdisplay /dev/vglinux1/test
--- Logical volume ---
LV Name /dev/vglinux1/test
VG Name vglinux1
LV UUID 1IdmIn-9Ne8-IZDS-PUYF-IyLP-Xz54-c50H2E
LV Write Access read/write
LV Status available
# open 0
LV Size 2,00 GB
Current LE 512
Segments 2
Allocation inherit
Read ahead sectors 0
Block device 254:5
[EMAIL PROTECTED] ~]# mkfs.reiserfs /dev/vglinux1/test
mkfs.reiserfs 3.6.19 (2003 www.namesys.com)
A pair of credits:
Yury Umanets (aka Umka) developed libreiser4, userspace plugins, and all
userspace tools (reiser4progs) except of fsck.
Hans Reiser was the project initiator, source of all funding for the first 5.5
years. He is the architect and official maintainer.
Guessing about desired format.. Kernel 2.6.16-rc6-mm2 is running.
Format 3.6 with standard journal
Count of blocks on the device: 524288
Number of blocks consumed by mkreiserfs formatting process: 8227
Blocksize: 4096
Hash function used to sort names: "r5"
Journal Size 8193 blocks (first block 18)
Journal Max transaction length 1024
inode generation number: 0
UUID: 9f9b271b-1ed6-4ffb-9cde-243d3859b221
ATTENTION: YOU SHOULD REBOOT AFTER FDISK!
ALL DATA WILL BE LOST ON '/dev/vglinux1/test'!
Continue (y/n):y
Initializing journal - 0%....20%....40%....60%....80%....100%
Syncing..ok
Tell your friends to use a kernel based on 2.4.18 or later, and especially not a
kernel based on 2.4.9, when you use reiserFS. Have fun.
ReiserFS is successfully created on /dev/vglinux1/test.
[EMAIL PROTECTED] ~]# mount /dev/vglinux1/test /mnt/disk
[EMAIL PROTECTED] ~]# cd /mnt/disk
[EMAIL PROTECTED] disk]# tar -xjf ~laurent/.ketchup/linux-2.6.15.tar.bz2
[EMAIL PROTECTED] disk]# df .
Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
/dev/mapper/vglinux1-test
2,0G 260M 1,8G 13% /mnt/disk
[EMAIL PROTECTED] disk]# ls
linux-2.6.15
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k
count=102400; time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.04user 1.60system 0:01.73elapsed 94%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+250minor)pagefaults 0swaps
0.00user 0.06system 0:15.53elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k
count=102400; time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.02user 1.60system 0:01.65elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+251minor)pagefaults 0swaps
0.00user 0.04system 0:09.72elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+190minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k
count=102400; time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.04user 1.63system 0:01.69elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+250minor)pagefaults 0swaps
0.00user 0.06system 0:15.58elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+192minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k
count=102400; time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.03user 1.64system 0:01.70elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+251minor)pagefaults 0swaps
0.00user 0.05system 0:09.49elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+190minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# cd
[EMAIL PROTECTED] ~]# umount /mnt/disk
[EMAIL PROTECTED] ~]#
[EMAIL PROTECTED] ~]# mkfs.ext2 /dev/vglinux1/test
mke2fs 1.38 (30-Jun-2005)
Étiquette de système de fichiers=
Type de système d'exploitation: Linux
Taille de bloc=4096 (log=2)
Taille de fragment=4096 (log=2)
262144 inodes, 524288 blocs
26214 blocs (5.00%) réservé pour le super usager
Premier bloc de données=0
16 bloc de groupes
32768 blocs par groupe, 32768 fragments par groupe
16384 inodes par groupe
Archive du superbloc stockée sur les blocs:
32768, 98304, 163840, 229376, 294912
Écriture des tables d'inodes: 0/16 1/16 2/16 3/16
4/16 5/16 6/16 7/16 8/16
9/1610/1611/1612/1613/1614/1615/16complété
Écriture des superblocs et de l'information de comptabilité du système de
fichiers: complété
Le système de fichiers sera automatiquement vérifié tous les 35 montages ou
après
180 jours, selon la première éventualité. Utiliser tune2fs -c ou -i pour
écraser la valeur.
[EMAIL PROTECTED] ~]# mount /dev/vglinux1/test /mnt/disk
[EMAIL PROTECTED] ~]# cd /mnt/disk
[EMAIL PROTECTED] disk]# tar -xjf ~laurent/.ketchup/linux-2.6.15.tar.bz2
[EMAIL PROTECTED] disk]# df .
Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
/dev/mapper/vglinux1-test
2,0G 253M 1,7G 14% /mnt/disk
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k count=102400;
time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.05user 0.68system 0:00.78elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+250minor)pagefaults 0swaps
0.00user 0.03system 0:10.43elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+190minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k count=102400;
time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.04user 0.67system 0:00.72elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+251minor)pagefaults 0swaps
0.00user 0.02system 0:10.47elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# sync; time dd if=/dev/zero of=toto bs=1k count=102400;
time sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.01user 0.69system 0:00.71elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+252minor)pagefaults 0swaps
0.00user 0.02system 0:10.26elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+190minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# grep /mnt/disk /proc/mounts
/dev/vglinux1/test /mnt/disk ext2 rw 0 0
[EMAIL PROTECTED] disk]# cd -
[EMAIL PROTECTED] disk]# umount /mnt/disk
[EMAIL PROTECTED] ~]# mkfs.reiser4 /dev/vglinux1/test
mkfs.reiser4 1.0.5
Copyright (C) 2001, 2002, 2003, 2004 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
Block size 4096 will be used.
Linux 2.6.16-rc6-mm2 is detected.
Uuid 500241b7-0035-4254-91f4-cd6fb6c556a0 will be used.
Reiser4 is going to be created on /dev/vglinux1/test.
(Yes/No): [K(Yes/No): Y[K(Yes/No): Ye[K(Yes/No): Yes[K(Yes/No): Yes
Creating reiser4 on /dev/vglinux1/test ...
Creating reiser4 on /dev/vglinux1/test
... done
[EMAIL PROTECTED] ~]# mount /dev/vglinux1/test /mnt/disk
[EMAIL PROTECTED] ~]# cd /mnt/disk
[EMAIL PROTECTED] disk]# tar -xjf ~laurent/.ketchup/linux-2.6.15.tar.bz2
[EMAIL PROTECTED] disk]# grep /mnt/disk /proc/mounts
/dev/vglinux1/test /mnt/disk reiser4
rw,atom_max_size=0x7e0c,atom_max_age=0x249f0,atom_min_size=0x100,atom_max_flushers=0x1,cbk_cache_slots=0x10
0 0
[EMAIL PROTECTED] disk]# df .
Sys. de fich. Tail. Occ. Disp. %Occ. Monté sur
/dev/mapper/vglinux1-test
2,0G 220M 1,7G 12% /mnt/disk
[EMAIL PROTECTED] disk]# time dd if=/dev/zero of=toto bs=1k count=102400; time
sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.10user 13.06system 0:18.88elapsed 69%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+250minor)pagefaults 0swaps
0.00user 0.05system 0:03.42elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# time dd if=/dev/zero of=toto bs=1k count=102400; time
sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.08user 12.88system 0:13.19elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+249minor)pagefaults 0swaps
0.00user 0.00system 0:05.19elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]# time dd if=/dev/zero of=toto bs=1k count=102400; time
sync
102400+0 enregistrements lus.
102400+0 enregistrements écrits.
0.09user 12.88system 0:13.17elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+251minor)pagefaults 0swaps
0.00user 0.00system 0:05.29elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
[EMAIL PROTECTED] disk]#
[EMAIL PROTECTED] disk]#
[EMAIL PROTECTED] disk]# exit
Script complété sur mar 21 mar 2006 22:58:31 CET
