Torsten72 <torsten.st@xxxxxxx> writes: > # loop-aes: AES-128 ... > 52428800 Bytes (52 MB) kopiert, 0,93555 Sekunden, 56,0 MB/s ... > # loop-aes: AES-256 ... > 52428800 Bytes (52 MB) kopiert, 0,953818 Sekunden, 55,0 MB/s ... > # dm-crypt: AES-128 ... > 52428800 Bytes (52 MB) kopiert, 0,554618 Sekunden, 94,5 MB/s ... > # dm-crypt: AES-256 ... > 52428800 Bytes (52 MB) kopiert, 0,560215 Sekunden, 93,6 MB/s Interesting results! Even if people generally seems to prefer dm-crypt over loop-aes, it is good to have statistics to back things up. > Can anybody tell me why the loop device is so slow even without encryption? > Compared to the openssl speed test the results for both loop-aes and > dm-crypt > don't look very good. Aren't you comparing apples and oranges here? OpenSSL doesn't read input from /dev/zero, nor does it write the output to a block device. If you want to compare things properly, try comparing just the encryption implementation of loop-aes/dm-crypt with that of OpenSSL. Don't forget to compare compiler optimization flags too. /Simon - Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
