A user of cryptsetup(through zuluCrypt) asked me a question i can not answer and asking it here.
In his system,"cryptsetup benchmark" gives the following results:
[root@sheep 13] ~ > cryptsetup benchmark
# Tests are approximate using memory only (no storage IO).
PBKDF2-sha1 341333 iterations per second
PBKDF2-sha256 193607 iterations per second
PBKDF2-sha512 64125 iterations per second
PBKDF2-ripemd160 303758 iterations per second
PBKDF2-whirlpool 64125 iterations per second
# Algorithm | Key | Encryption | Decryption
aes-cbc 128b 183,6 MiB/s 215,4 MiB/s
serpent-cbc 128b 68,0 MiB/s 68,9 MiB/s
twofish-cbc 128b 167,7 MiB/s 177,5 MiB/s
aes-cbc 256b 142,3 MiB/s 161,5 MiB/s
serpent-cbc 256b 69,7 MiB/s 67,0 MiB/s
twofish-cbc 256b 170,1 MiB/s 177,8 MiB/s
aes-xts 256b 201,2 MiB/s 205,6 MiB/s
serpent-xts 256b 69,7 MiB/s 67,6 MiB/s
twofish-xts 256b 180,5 MiB/s 175,6 MiB/s
aes-xts 512b 147,0 MiB/s 152,5 MiB/s
serpent-xts 512b 70,5 MiB/s 67,8 MiB/s
twofish-xts 512b 182,0 MiB/s 176,0 MiB/s
The system is decent enought.
The write speed he is getting though through the mapper is unusually slow,the test is below:
[root@sheep 8] ~ > dd if=/dev/zero of=test.img bs=70M count=1
1+0 Datensätze ein
1+0 Datensätze aus
73400320 Bytes (73 MB) kopiert, 2,58497 s, 28,4 MB/s
[17.03.2013 21:50 Uhr]
[root@sheep 9] ~ > cryptsetup create test test.img
Passsatz eingeben:
[17.03.2013 21:51 Uhr]
[root@sheep 10] ~ > dd if=/dev/zero of=/dev/mapper/test bs=10M count=1
1+0 Datensätze ein
1+0 Datensätze aus
10485760 Bytes (10 MB) kopiert, 67,2014 s, 156 kB/s
[17.03.2013 21:52 Uhr]
[root@sheep 11] ~ > cryptsetup remove test
As the test show,He is getting 156kB/s when using dd over the encryption mapper verses 28MB/s when using dd straight.
Where is the wrong in his system? version of cryptsetup used is 1.6.0
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