Re: af_alg: Add ability to use Linux kernel crypto API on data in memory

[Paul Eggert]

Bruno Haible wrote:
> Oops, I goofed with "git diff". Here's the correct patch to test.

I tried those bench-md5 benchmarks on two platforms, with somewhat more 
disappointing results.

I observed a real-time slowdown ranging from 11% (large buffers) to 22x (small 
buffers) on Intel Xeon E3-1225 V2 (circa 2012 CPU), Ubuntu 16.04, Linux 4.4.0, 
glibc 2.23. See attached file ubuntu1604.txt.

I observed a real-time slowdown ranging from 8% (large buffers) to 43x (small 
buffers) on AMD Phenom II X4 910e (circa 2010 CPU), Fedora 28, Linux 4.16.5, 
glibc 2.27. See attached file fedora28.txt.

These numbers compare somewhat unfavorably with your report, where the real-time 
slowdown ranged from 1.5% (large buffers) to 25x (small buffers), as reported in 
<https://lists.gnu.org/r/bug-gnulib/2018-05/msg00035.html>.

ubuntu1604.txt
Description: Text document

fedora28.txt
Description: Text document