On Sunday 16 September 2012 01:48:16 Ming Lei wrote: Hi, > Currently only very few usbnet devices support the traffic based > runtime PM, eg. wake up devices if there are packets to be transmitted. > > For the below situation, it should make sense to runtime suspend usbnet > device to save power: > > - after network link becomes down Basically cool design, but it raises two fundamental questions and some detail questions. > This patch implements the runtime PM triggered by network link change > event, and it works basically on asix usbnet device after a simple > runtime PM test. 1) Does it actually save power? You are constantly waking up a CPU. >From that perspective it is possible that leaving on the ethernet is actually better in terms of power. Only measurements can answer that question. 2) Do we have many devices that would be serviced with this approach? Regards Oliver -- 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
