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> a plateau is hit after 8 threads?

Most of the graphs plateau around 6 threads, for pretty much all the caches under test. I wonder if there is some interesting architectural issue with cache-sharing on this particular platform?

I guess memory controller behavior; especially if it's not set up for parallelism IOPS but for single-threaded throughout (channel interleaving).

Thanks for the feedback. The plateauing is due to a taskset misconfiguration. I fixed it and reran the benches. They look much better now.

g = graviton which doesn't support SMT so 1 vcpu is 1 full core