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* As Nick Fisk said in his presentation — Ceph is a Software-Defined Storage '''and every piece of Ceph «Software»''' will run faster with every GHz of CPU clock speed.
* Server CPUs often have NUMA (Non-Uniform Memory Access). Which means that some CPU cores don’t have direct access to the RAM and/or part of the hardware, but forward requests to other cores.
* You should try to use CPUs with more clock speed and without NUMA to maximize the performance. That is, a slower CPU with more cores is probably worse than a faster CPU with a smaller number of cores…
* …but within reason as one Bluestore OSD can eat up to ~6 cores under full load.
* «Clock speed» means nominal, not Turbo Boost speed, because Turbo Boost is only beneficial for single-threaded workloads.
