For each 1 MiB of data en/decrypted, 'cryptsetup benchmark' is setting
up a new AF_ALG socket, which involves 4 system calls and is included in
the data en/decryption time. With high-speed ciphers (e.g. VAES
optimized AES-XTS) this can measure well over 10000 AF_ALG socket setups
per second. This is not representative of dm-crypt, which only
allocates a cipher when the dm-crypt device is created.
Therefore, allocate the AF_ALG socket once, before doing the benchmark.
On AMD Ryzen 9 9950X this increases the 'cryptsetup benchmark' result of
AES-256-XTS slightly, from 14000 MiB/s to 14600 MiB/s.
Note that an in-kernel benchmark of the crypto API with the same block
size (65536 bytes) gives 34100 MiB/s, so AF_ALG still takes more time
than the en/decryption itself -- this cannot easily be addressed though.
Signed-off-by: Eric Biggers <ebiggers@google.com>
This patch switches code to SPDX one-line license identifiers according to
https://spdx.dev/learn/handling-license-info/
and replacing long license text headers.
I used C++ format on the first line in style
// SPDX-License-Identifier: <id>
except exported libcryptsetup.h, when only C comments are used.
The only additional changes are:
- switch backend utf8.c from LGPL2+ to LGPL2.1+ (as in systemd)
- add some additional formatting lines.
