On Fri, 2009-05-15 at 19:15 -0400, Dan Williams wrote: > Well, what does "background scan" mean? mac80211 will obviously accept > beacons from APs on the same channel and happily add them to the scan > list. Only if powersave/beacon filtering isn't enabled. Actually, mac80211 does beacon filtering itself now, so I don't think this happens any more (I did that on purpose so people don't really rely on the former behaviour) > But a background scan would imply that the card itself is taking > over the decision about when to jump around and scan, basically the same > thing NM is doing, right? When would the card/stack decided to > background scan, and what channels would it background scan on? If it > doesn't do more or less all passive channels, then it wouldn't be that > useful for figuring out the site survey data. I would think that mac80211, while asked to scan when associated, could simply do something like calculating how long it can go off-channel under the current QoS requirements, and then go off-channel for that, wait for the next on-channel beacon and some traffic, scan the next channel(s) again etc. johannes
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