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That would be great. But isn't there a danger, that such a CPU, at least if implemented naievely, would basically mostly idle, since modern OoO processors sched

That would be great. But isn't there a danger, that such a CPU, at least if implemented naievely, would basically mostly idle, since modern OoO processors schedule memory access dynamically? For hard real-time tasks, some CPUs don't have caches, to make timing more predictable, but there is a heavy performance penalty to be paid for that predictability. Are you familiar with works like [1]? That is thinking in this direction, but from a different angle. [1] G. Heiser, G. Klein, T. Murray, Can We Prove Time Protection?. https://arxiv.org/pdf/1901.08338.pdf https://arxiv.org/pdf/1901.08338.pdf

sitkack 6y ago
> heavy performance penalty to be paid for that predictability I think this is probably a fascinating area of study. It feels like there is a power/time/space non-linearity and being able to trade one for another. How about the CPU is put into a fixed timestep mode, where all operations take the same amount of time. If there was a hardware level concept of a thread, it could be a thread property. Another option would be a queue of futures with a rate control based on the required security properties.