On Tue, Apr 26, 2016 at 11:27:17AM +0200, Lucas Stach wrote: > Am Dienstag, den 26.04.2016, 09:58 +0800 schrieb Peter Chen: > > On Mon, Apr 25, 2016 at 12:55:42PM +0200, Lucas Stach wrote: > > > The Chipidea EHCI core seems to behave sanely and doesn't need > > > the IO watchdog. This kills off 10 non-deferrable wakeup events > > > per second when the controller is otherwise idle. > > > > > > > What does this 10 wakeup events? From what I see, it is 10 hrtimer > > event, does they affect a lot? > > As they are non-deferrable they limit the time the CPU can stay in deep > idle modes to 100ms. On an otherwise idle system those 10 wakeups/s > represent as much as 50% of the overall system timer wakeups. > > On i.MX6, where the cores don't normally flush their caches in deep idle > this doesn't matter that much, but as this driver is used on lots of > systems I would like to get rid of the unnecessary timer now, before it > spreads even more. > Get it, thanks. -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
