Hi Johannes, Especially for Netbook and Handle devices with newer processor. Putting system into lower C-state and having longer battery life is very important. I think letting driver making the default choice based on the power source is the right way to go, but always can be overwritten by upper layer (mac80211 or NM?). I do not think we need to expose all the power levels to user space; those should be internal decision (mac80211 or driver). User space can make the choice of turn power saving mode on/off and leave the detail decision to the lower layer which has better knowledge of how to balance the power and performance. Wey-Yi Guy Intel Corporation 2111 N.E. 25th Avenue M/S JF3-308 Hillsboro OR 97124-5961 USA Work Phone: 503-264-6023 (OR) Cell Phone: 503-329-8410 Email: wey-yi.w.guy@xxxxxxxxx -----Original Message----- From: Johannes Berg [mailto:johannes@xxxxxxxxxxxxxxxx] Sent: Tuesday, March 24, 2009 6:53 AM To: Dan Williams Cc: Guy, Wey-Yi W; linux-wireless; Kalle Valo; Matthew Garrett; Marcel Holtmann Subject: Re: wireless powersaving (in NM?) > Therefore, I think the "power saving level" needs to be determined by > pm_qos. Cf. http://www.lesswatts.org/projects/power-qos/ too, which is the old description of pm_qos, see Documentation/power/pm_qos_interface.txt too of course. johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
