newbie: Speed of loop-aes | |
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Hi List, I did some performance tests using the benchmark bonnie++ to evaluate different disk encryption possibilities. The results regarding loop-aes are a bit strange for my understanding. I ran the tests on a notebook with Debian Etch, 1GB RAM and a Linux 2.6.22.2 Kernel. Bonnie was startet with the following parameters: bonnie++ -b -u root -s 4000 As a result loop-aes has a sequential input (block) of 29127 K/sec where the sequential input with no encryption is 25123 K/sec. The same with sequential output (block) (loop-aes: 27633 K/sec and no encryption: 24267 K/sec). What I don't understand is how encrypted reads and writes per block could be faster as plaintext reads / writes? Any comments are welcome! Kind regards, Markus P.S.: The bonnie++ output: LOOP-AES: ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP 4000M 18554 59 27633 7 13696 3 18922 77 29127 4 102.3 0 NO ENCRYPTION: ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP 4000M 24085 77 24267 6 11978 3 24825 75 25123 3 103.9 0 - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/