On Mon, 10 Feb 2025 12:27:00 -0500 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > On Mon, 10 Feb 2025 17:20:59 +0000 > David Laight <david.laight.linux@xxxxxxxxx> wrote: > > > Hmmm... you lose big-time anyway. > > > > All you need is a lot of network traffic 'pinch' the process context until > > the hardware interrupt, NAPI softint code and rcu softint code completes. > > That can easily take several milliseconds. > > Not on PREEMPT_RT. All that runs as threads. > > And this is a feature that we would like on RT for non RT tasks. Actually, this doesn't even need PREEMPT_RT to not hit your example. You can build and boot your system with interrupts as threads, and that also includes softirqs. -- Steve
