On 17.03.2013 17:36, .. ink .. wrote: > Sorry for my previous email without a title,resending the email with a > title this time. > > 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 <at> 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 <at> 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 <at> sheep 9] ~ > cryptsetup create test test.img > Passsatz eingeben: > > [17.03.2013 21:51 Uhr] > [root <at> 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 <at> 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. dd was with conv=fsync? Otherwise you are measuring buffer cache. > Where is the wrong in his system? version of cryptsetup used is 1.6.0 I would say, there are quite a few details missing. Hardware, Software? 28.4 MB/s also isn't what i would call fast, what is that? -- Matthias _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
