On Tue, Feb 06, 2024 at 10:44:33AM -0800, Paul E. McKenney wrote: ... > > > > - with lazy RCU enabled hrtimer_interrupt() takes like 2x more to > > return, respect to the other cases (is this expected?) > > This last is surprising at first glance, but I could be missing > something. Joel, Uladzislau, thoughts? On this specific point, I repeated the tests with the latest 6.8 kernel and now I don't notice this difference anymore. hrtimer_interrupt() time is always in the range [4K, 16K) ns, both with lazy RCU off and lazy RCU on. I don't really know why I was getting different results, probably some noise triggered by something running in user-space...? In any case I will update my old post with these new results and I wouldn't consider this an issue for now. Thanks, -Andrea
