Not sure why you have been downvoted but even I too was gnashing my teeth. Also introducing unwanted complexity of cache coherence etc and linking irrelevant concepts to support his argument. Sigh!

These are all well understood by RTOS firmware and Linux driver people. The author, if he has not understood the problem or what is happening should at least use the mailing lists, read on documentation etc to understand how things work rather than write a blog post blaming the kernel people assuming they have not thought enough while designing.