samsung 850 evo

Startup finished in 2.461s (firmware) + 24ms (loader) + 17.075s (kernel) + 1.364s (userspace) = 20.926s

hdparm -Tt /dev/mapper/ssd
/dev/mapper/ssd:
 Timing cached reads:   21210 MB in  2.00 seconds = 10614.93 MB/sec
 Timing buffered disk reads: 1228 MB in  3.00 seconds = 408.96 MB/sec


dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync,notrunc
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.32714 s, 461 MB/s


dd if=tempfile of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.49912 s, 430 MB/s


cryptsetup luksDump ...
...
Cipher name:    aes
Cipher mode:    xts-plain64
Hash spec:      sha1
Payload offset: 8192
...