Link o' the day: A flashback
I ran across this recently. Apparently, Larry Loucks passed away back in 2006.
Computer Business Review, June 23, 1995: IBM SHIFTS EMPHASIS OF WORK ON MICROKERNEL.
I've got no idea what "Instead, it has been prototyped further down in the kernel, where performance gains of up to 1,000 times have apparently been achieved" is supposed to mean, and the IBM microkernel was hardly a clean-room effort; it was based on the Mach kernel from CMU. But still, I was there! That's where I spent a formative year or so of my life.
And the performance of the IBM microkernel was really, really horrible.