On Wed, 2012-06-13 at 13:50 -0700, Pedersen, Thomas wrote: > On Wed, Jun 13, 2012 at 02:56:26PM +0300, Kalle Valo wrote: > > On 06/13/2012 02:37 PM, Luciano Coelho wrote: > > > On Wed, 2012-06-13 at 07:40 +0200, Johannes Berg wrote: > > >> On Tue, 2012-06-12 at 13:43 -0700, Thomas Pedersen wrote: > > >>> Support configuring an RSSI threshold in dBm (s32) when requesting > > >>> scheduled scan, below which a BSS won't be reported by the cfg80211 > > >>> driver. > > >> > > >> I'm confused -- were you going to do scheduled scan only? Makes sense, > > >> but if you could maybe change the subject a bit to "specify ... in > > >> scheduled scan"? > > > > > > It makes more sense with scheduled scans, but maybe it is also desirable > > > with normal scans to reduce the amount of scan results traffic? > > > > > > At least if we consider the intermediate scan results that Victor has > > > been working on... We may want to report all scan results at the end, > > > but only send intermediate events if all the matches are satisfied, for > > > example. > > > > > > Just thinking out loud a bit. > > > > Good point. > > > > Funnily enough I don't have any idea how ath6kl has implemented this > > feature, but in theory this feature is useful also for the current > > normal scan (when the firmware/hardware supports it) as we can avoid > > host wakeups. If there are 10 APs, but all are below the RSSI threshold, > > we will have only 1 host wakeup (scan ready event) opposed to 11 wakeups > > (10 AP found events plus 1 scan ready event). > > But can the host even sleep on normal scans? Why not? If you're doing a full scan in 11bg + 11a channels it can take a long time... Some applications may use very frequent scans, for example for location services, so saving some wake-ups every time can prove a big improvement in power consumption in the long run... > If so, maybe it makes sense to convert NL80211_ATTR_SCHED_SCAN_MATCH > into general scan matching parameters instead of having a set for each > scan type? I'm sure I discussed this with Johannes a long time ago, but now I can't remember why we decided to keep it for sched scans only... -- Luca. -- 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
