Part Number: AM623
Other Parts Discussed in Thread: SHA-256
#1. I operated on Linux SDK following:https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/11_01_05_03/exports/docs/linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP.html#
check module loaded:
root@am62xx-evm:/home# uname -a
Linux am62xx-evm 6.6.32-ti-g6de6e418c80e-dirty #1 SMP PREEMPT Fri Jul 26 14:32:20 UTC 2024 aarch64 GNU/Linux
root@am62xx-evm:~# lsmod |grep sa2ul
sa2ul 32768 0
authenc 12288 1 sa2ul
root@am62xx-evm:~# lsmod |grep cryptodev
cryptodev 49152 0
#2. Tested with two type command: sha256sum <file and openssl dgst -sha256 <file, the CPU loading and time spend with openssl is higher than sha256sum with small file.
What is the difference between sha256sum and openssl dgst -sha256?
root@am62xx-evm:/home# time -v openssl dgst -sha256 <test.c
SHA2-256(stdin)= 25ef07f7d7f36f9c67ea3a357f66bb16028e3165e624ff007323ebc6ac780cb5
Command being timed: "openssl dgst -sha256"
User time (seconds): 0.01
System time (seconds): 0.00
Percent of CPU this job got: 72%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 0.01s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 23552
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 279
Voluntary context switches: 2
Involuntary context switches: 0
Swaps: 0
File system inputs: 16
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
root@am62xx-evm:/home# time -v openssl dgst -sha256 <test.c
SHA2-256(stdin)= 25ef07f7d7f36f9c67ea3a357f66bb16028e3165e624ff007323ebc6ac780cb5
Command being timed: "openssl dgst -sha256"
User time (seconds): 0.00
System time (seconds): 0.00
Percent of CPU this job got: 85%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 0.01s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 23552
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 278
Voluntary context switches: 1
Involuntary context switches: 0
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
root@am62xx-evm:/home# time -v sha256sum <test.c
25ef07f7d7f36f9c67ea3a357f66bb16028e3165e624ff007323ebc6ac780cb5 -
Command being timed: "sha256sum"
User time (seconds): 0.00
System time (seconds): 0.00
Percent of CPU this job got: 66%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 0.00s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 5120
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 54
Voluntary context switches: 1
Involuntary context switches: 0
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
root@am62xx-evm:/home#
Test with larger size file
#3. unload cryptodev
root@am62xx-evm:/home# modprobe -r cryptodev
[ 1210.056652] cryptodev: driver unloaded.
root@am62xx-evm:/home# lsmod |grep sa2ul
sa2ul 32768 0
authenc 12288 1 sa2ul
root@am62xx-evm:/home# lsmod |grep cryptodev
root@am62xx-evm:/home#sha256sum
root@am62xx-evm:/home# time -v sha256sum <tisdk-default-image-am62xx-evm-11.00.09.04.rootfs.wic.xz
80724f3bc5a5e22b544d9510d12a077e537b65c473a56d7e109a316f4a447e1d -
Command being timed: "sha256sum"
User time (seconds): 10.01
System time (seconds): 0.60
Percent of CPU this job got: 99%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 10.67s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 5120
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 60
Voluntary context switches: 1
Involuntary context switches: 7
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0openssl dgst -sha256: quite faster.
root@am62xx-evm:/home# time -v openssl dgst -sha256 <tisdk-default-image-am62xx-evm-11.00.09.04.rootfs.wic.xz
SHA2-256(stdin)= 80724f3bc5a5e22b544d9510d12a077e537b65c473a56d7e109a316f4a447e1d
Command being timed: "openssl dgst -sha256"
User time (seconds): 1.48
System time (seconds): 0.99
Percent of CPU this job got: 98%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 2.52s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 23552
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 278
Voluntary context switches: 1
Involuntary context switches: 4
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0With cryptodev loaded:
root@am62xx-evm:/home# lsmod |grep sa2ul
sa2ul 32768 0
authenc 12288 1 sa2ul
root@am62xx-evm:/home# lsmod |grep cryptodev
cryptodev 49152 0
root@am62xx-evm:/home#
root@am62xx-evm:/home# time -v sha256sum <tisdk-default-image-am62xx-evm-11.00.09.04.rootfs.wic.xz
80724f3bc5a5e22b544d9510d12a077e537b65c473a56d7e109a316f4a447e1d -
Command being timed: "sha256sum"
User time (seconds): 10.09
System time (seconds): 1.44
Percent of CPU this job got: 98%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 11.67s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 4608
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 3
Minor (reclaiming a frame) page faults: 58
Voluntary context switches: 16
Involuntary context switches: 305
Swaps: 0
File system inputs: 1698576
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
root@am62xx-evm:/home# time -v openssl dgst -sha256 <tisdk-default-image-am62xx-evm-11.00.09.04.rootfs.wic.xz
SHA2-256(stdin)= 80724f3bc5a5e22b544d9510d12a077e537b65c473a56d7e109a316f4a447e1d
Command being timed: "openssl dgst -sha256"
User time (seconds): 1.61
System time (seconds): 1.07
Percent of CPU this job got: 97%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0m 2.74s
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 23552
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 14
Minor (reclaiming a frame) page faults: 273
Voluntary context switches: 11
Involuntary context switches: 3
Swaps: 0
File system inputs: 1736
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
root@am62xx-evm:/home#
Conclusion:
#1. The benchmark are quite difference between checksum256 and openssl dgst -sha256 , with openssl is much quick.
#2. With cryptodev loaded or not, not obviously diffidence to each test method's benchmark.
Question:
#1. How to know whether hardware security accelerator is used or not. if unload the module means it won't be used, why the benchmark is almost same?
#2. Is there suggestion when to use sha256sum or openssl dgst -sha256, for example for difference data size?
