Linux OS: Opening raw device can slow down on certain kernels

Last week at COLLABORATE I talked about measuring your baselines so you can determine when a negative (or even positive) change has happened, and the MOS document "Open Raw Device is Slower with Kernel 2.6.32-358.el6.x86_64" from article ID 1999421.1 proves that we have a lot of measuring still to automate because this is a basic OS operation which needs investigation in order to find out when it gets off kilter.