Hyper Threading Aware Process Scheduling Heuristics
http://www.cl.cam.ac.uk/~jrb44/docs/bulpin_usenix05/

Here is a rundown on hyper-threading. Over the past year we tested various machine roles with HT-ON and rolled that change into production for most systems. However, we found it hurt BFS performance. This article covers the "Engineer" level content and touches on why it is not the best solution for all software.

Jeffrey Kelly
http://sailwhatcom.com