On Sun, 2010-03-21 at 09:22 -0700, Curtis Larsen wrote: > Yes, I do run wpa_supplicant. I would love to see a sample config for > this -even though it sounds like it would not work in all areas across > the campus. Still, better than what I have right now.
All you need to do is to add scan_freq into the network configuration block in wpa_supplicant.conf (and not have any other network configuration blocks enabled that would trigger scan for every channel). You will need to manually figure out which channels the APs you are interested in are using and then add them to the list (e.g., scan_freq=5180 5200 5220 5240). Please note that this requires wpa_supplicant 0.7.x and use of nl80211 (-Dnl80211) to work. > Well, the thing is ...I know that in this environment 5ghz will always > provide a better experience, so why even waste resources scanning 2.4, > calculating preferences, etc.? Since all AP's run 2.4 and 5ghz on the > same SSID, preferring certain AP's would not help. 5ghz is available > everywhere so I never want to even see a 2.4GHz BSS. While it may indeed be the case that 5 GHz band will provide you better connectivity in almost all cases, I don't think I would go as far as saying that it would always be better. Anyway, if you are fine with doing this unconditionally, scan_freq option may get you close to what you want to see. > Automatic is good unless it is based on flawed assumptions. For > example, just because the signal strength might be greater on the > 2.4ghz band does not mean that the overall client experience will be > better. In fact, in general I see slightly lower signal strength on > 5ghz but still get double the throughput there. Any automatic trigger > would have to be based on signal and channel width and > noise/congestion I think. Sure. wpa_supplicant is trying to take into account other things than just the signal strength. This includes maximum transmit rate, but that part does not yet handle IEEE 802.11n rates and channel width. It would sound reasonable to add that, though, and that would likely increase the likelihood of picking 5 GHz AP in your particular case. Similarly, BSS load may be available from the AP (depending on what capabilities the AP has for advertising things) and wpa_supplicant should also be extended to allow that to be taken into account in BSS selection. - Jouni _______________________________________________ ath9k-devel mailing list [email protected] https://lists.ath9k.org/mailman/listinfo/ath9k-devel
