When I wrote the Why Does Internet Keep Breaking? blog post a few weeks ago, I claimed that FRR still uses single-threaded routing daemons (after a too-cursory read of their documentation).
Donald Sharp and Quentin Young politely told me I was an idiot I should get my facts straight, I removed the offending part of the blog post, promised to write another one going into the details, and Quentin improved the documentation in the meantime, so here we are…