Interesting! Was this result (erratic behaviour when thread affinity were not set) obtained with core parking enabled or disabled? If enabled, it would be interesting to see if the inconsistencies in results without affinity disappear if core parking is disabled. High performance power plan...
TL;DR: a 10% performance hit in single-threaded performance under Windows 8.1 on a Magny-Cours 2-module CPU is found when three factors are allowed to coincide: thread migration across modules is allowed, the OS timer is at a high resolution, and core parking is allowed.
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