On 06/09/2015 10:37 AM, Steve Snyder wrote: > Why is the generic version of the SHA256 driver selected at runtime instead of the SSSE3 version on this x86_64 system? Because that driver is built-in to the kernel. If you want to use the ssse3 version, load it. There are a handful of ways to do so. For instance, you could edit /etc/modules-load.d/sha256.conf and add one line with the name of the module.