We don’t do SMT. Our numbers suggest that available chip area and power resources are better put into more cores instead of into SMT sharing of a single core. It may seem wasteful to have a core idling in stall when a load misses in cache, but for this architecture the overhead of trying to use the core for something else is greater than any saving from sharing. And, for free, having no SMT means a large number of security attacks are impossible on a Mill.
Reply To: Mill vs. Spectre: Performance and Security Ivan Godard