But… what's the difference between nohz_full and tickless? The article mentions tickless as a means of avoiding clock ticks and then ignores it for the rest of the article.
tickless is a lie, the kernel still requires periodic ticks for house keeping, nohz_full is completely tickless on all except one physical cpu (default: cpu0) that does house keeping.
Ah, I didn't know that. Thanks!
Hi guys, thanks for the feedback. I updated the blog post to include a table comparing different versions of RHEL, along with tick behavior you should expect (keys off nr_running).
Hi Jeremy. The articles on your blog are great. I wandered across this one while trying to figure out the best practice for isolating a core to reduce variability when benchmarking CPU intensive tasks. Your tickless explanation helped a lot. Hope you stick around HN. Thanks!