On Fri, 8 Jun 2018 17:50:26 +0200
Dimitry Sibiryakov <s...@ibphoenix.com> wrote:
> 08.06.2018 17:47, Hristo Stefanov wrote:
> > It has 4 cores but the openssl benchmark is single threaded. Here
> > are the repeated benchmarks with the openssl process pinned to a
> > single core on the Intel(R) Core(TM) i5-2500 CPU:
>
> It doesn't matter for speculative execution. Run 4 benchmarks in
> parallel.
>
>
Speculative execution only works within the boundaries of a single core
so my results are correct.
Here are the benchmarks anyway:
$ for i in {0..3}; do sudo taskset -c $i openssl speed -elapsed -evp
aes-128-xts & done;
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
16384 bytes
aes-128-xts 255677.39k 896166.61k 2033702.49k 3154852.86k 3749115.22k
3804332.03k
aes-128-xts 256324.77k 898756.20k 2037401.94k 3157264.73k 3736510.46k
3811480.92k
aes-128-xts 256659.08k 902971.56k 2044758.10k 3156077.91k 3728381.27k
3807581.53k
aes-128-xts 256870.74k 900522.90k 2041011.88k 3159909.72k 3744429.40k
3805495.30k
$ for i in {0..3}; do sudo taskset -c $i openssl speed -elapsed -evp
aes-128-cbc & done;
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
16384 bytes
aes-128-cbc 550000.15k 635221.31k 660944.90k 667407.02k 669136.21k
669390.17k
aes-128-cbc 549710.10k 634700.76k 659112.79k 665637.21k 667885.57k
666872.49k
aes-128-cbc 548084.97k 633240.28k 659870.63k 666325.67k 668393.47k
668472.66k
aes-128-cbc 548962.02k 634942.40k 660375.47k 666916.86k 668931.41k
668740.27k
The reason for XTS to be faster than CBC is that in XTS there is no
dependency between the blocks much like in ECB and that is why it gives
better performance. Here are ECB results:
$ for i in {0..3}; do sudo taskset -c $i openssl speed -elapsed -evp
aes-128-ecb & done;
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
16384 bytes
aes-128-ecb 582299.13k 1737014.42k 3204176.13k 3722085.38k 3846059.35k
3875291.14k
aes-128-ecb 583074.53k 1742079.38k 3207300.18k 3719742.12k 3870187.52k
3893269.85k
aes-128-ecb 581938.63k 1740206.57k 3199143.34k 3699344.04k 3844000.43k
3867497.81k
aes-128-ecb 582175.62k 1743287.57k 3205212.76k 3721558.36k 3869245.44k
3892898.47k
Feel free to reproduce the benchmarks.
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