I did a microbenchmark in user space... let's see if I can find it. On April 27, 2015 1:03:29 PM PDT, Borislav Petkov <b...@alien8.de> wrote: >On Mon, Apr 27, 2015 at 12:59:11PM -0700, H. Peter Anvin wrote: >> It really comes down to this: it seems older cores from both Intel >> and AMD perform better with 66 66 66 90, whereas the 0F 1F series is >> better on newer cores. >> >> When I measured it, the differences were sometimes dramatic. > >How did you measure that? I should probably do the same on some newer >AMD machines... We're using k8_nops on all AMD, even though the >optimization manuals cite different NOPs on newer AMD families. > >Thanks.
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