On Fri, 15 Nov 2024 09:26:07 +0100 Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxx> wrote:
Nevertheless it sounds like a really high latency for wake_up(). I have a custom driver which basically gets an IRQ, and calls wake_up on a read() call. This wake_up() on a high cpu usage can be more than 1ms ! Even with a fifo/99 priority for my kernel thread ! I don't know if it rings any bell ? I can obviously do more tests if it can help getting down to the issue :-).
Try running timerlat. -- Steve
