Great article. Clears up that nagging "I know this is good but how does it help?" I had about preemtable kernel. When I look at the jitter results in figure three I have two related questions. Why is the distribution so balanced in the vertical direction (rather than skewed mostly to the positive), and why are almost all the positive data points balanced almost exactly by a negative point. Could this be a bug in Realfeel where a 'delayed' interrupt incorrectly causes a successive accurate interrupt to be reported as 'early' by the same amount? You can also see a few points in figures one and two where they exceed the general noise.