Was reading the article "Intel’s Haswell CPU Microarchitecture" at real world technologies: http://www.realworldtech.com/haswell-cpu/ ran across this paragraph on the second page at the bottom.
"One difference in Haswell’s decoding path is the uop queue, which receives uops from the decoders or uop cache and also functions as a loop cache. In Sandy Bridge, the 28 entry uop queue was replicated for each thread. However, in Ivy Bridge the uop queue was combined into a single 56 entry structure that is statically partitioned when two threads are active. The distinction is that when a single thread is executing on Ivy Bridge or Haswell, the entire 56 entry uop buffer is available for loop caching and queuing, making better use of the available resources."
Reminded me of the "disable core parking" thread and some of the mixed results I got with it enabled/disabled. Anyways since the "disable core parking" thread is locked, and I doubt the mods want a continuation that's all I have.