On Saturday, December 23, 2023 at 10:19:53 PM PST, Simon Burge <sim...@netbsd.org> wrote:
> I have a grotty hack that attempted to spin if the requested timeout > was less than a tick based on what DragonflyBSD does. It mostly > worked for simple tests but I haven't tested it seriously. It's at > https://www.NetBSD.org/~simonb/pollfixhack.diff . is that really viable on uniprocessor machines? > This is potentially >another direction until we get a pure tickless kernel... You can only do tickless if you can track how much time is elapsing when no ticks fire, or none are pending. I don't see how to do that without a high-res timer like a CPU cycle counter, or I/O bus cycle counter, or what-have-you. Gong fully tickless would therefore end support for machines without such a timer. Is NetBSD ready to do that?
