[mtanski]

My knowledge here is rather dated, and I'm unfamiliar with the minio code base... But ~ a decade ago Intel invested a fair amount of effort into optimizing the oss Erasure Coding libraries for Intel CPUs.

Back then CPUs had less cores, RS coding was relatively more expensive and certainly CPU bound on then new NVMe flash devices

It's possible, even likely this is the result of that

[gigatexal]

Each of the CPUs tested are from various generations and have different TDPs. It's hard to benchmark 2-cpus if they're not in the same class TDP wise or from the same generation etc.