I am having a similar issue using Ubuntu 12.04 x86_64.
mdadm RAID5, 3x 2TB Hard drives.
dm-crypt on /dev/md0 (aes-xts-plain -s 256, but cipher does NOT matter)
System performance is very bad on 12.04:
root@chimera:~# time sh -c "dd if=/dev/zero of=/dev/mapper/md0_crypt bs=8k
count=2000000 && sync"
2000000+0 Datensätze ein
2000000+0 Datensätze aus
16384000000 Bytes (16 GB) kopiert, 271,431 s, 60,4 MB/s
real 4m31.558s
user 0m0.352s
sys 0m11.829s
On 10.04 bootet from flash drive:
root@ubuntu:~# time sh -c "dd if=/dev/zero of=/dev/mapper/md0_crypt bs=8k
count=2000000 && sync"
2000000+0 Datensätze ein
2000000+0 Datensätze aus
16384000000 Bytes (16 GB) kopiert, 178.911 s, 91.6 MB/s
real 2m59.269s
user 0m0.290s
sys 0m11.680s
System load on 12.04 goes up to 10, on 10.04 it is only ~1.
This is "top" while dd'ing on 12.04:
top - 20:53:42 up 14:06, 3 users, load average: 4.63, 2.62, 1.67
Tasks: 119 total, 2 running, 117 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 20.6%sy, 0.0%ni, 59.9%id, 19.3%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 8087012k total, 7873560k used, 213452k free, 7297544k buffers
Swap: 8298492k total, 0k used, 8298492k free, 99324k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5137 root 20 0 0 0 0 D 21 0.0 0:21.24 kworker/3:1
2126 root 20 0 0 0 0 R 21 0.0 0:34.29 kworker/1:2
5140 root 20 0 0 0 0 D 18 0.0 0:03.54 kworker/2:3
2912 root 20 0 0 0 0 D 17 0.0 0:55.45 kworker/0:1
2436 root 20 0 0 0 0 S 12 0.0 69:22.81 md0_raid5
5134 root 20 0 12912 664 544 D 4 0.0 0:09.65 dd
35 root 20 0 0 0 0 S 1 0.0 0:02.37 kswapd0
718 root 20 0 0 0 0 S 0 0.0 0:05.05 kworker/3:2
4585 root 20 0 0 0 0 S 0 0.0 0:48.45 kworker/2:2
5135 root 20 0 0 0 0 S 0 0.0 0:04.76 flush-252:0
5138 root 20 0 0 0 0 S 0 0.0 0:00.50 kworker/1:1
5339 root 20 0 17332 1292 960 R 0 0.0 0:00.02 top
1 root 20 0 24324 2300 1372 S 0 0.0 0:00.80 init
2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0 0.0 0:00.21 ksoftirqd/0
6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
7 root RT 0 0 0 0 S 0 0.0 0:00.10 watchdog/0
Please just tell me what further information you need.
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https://bugs.launchpad.net/bugs/997695
Title:
severe performance issue using mdadm raid5 on top of LUKS
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