On Thu, Feb 16, 2017 at 08:10:44AM +0000, Peer, Ilan wrote: > According to the wpa_supplicant AP scoring, it would indeed seem that the 2.4GHz AP is proffered since it has better SNR (although the SNR for both is good. Generally, wpa_s considers any SNR above 30 as good). > > a0:55:4f:66:d5:18 freq=2447 qual=0 noise=-89~ level=-49 snr=40* flags=0xb age=0 est=65000 > a0:55:4f:66:d5:10 freq=5240 qual=0 noise=-92~ level=-67 snr=25 flags=0xb age=0 est=390001 > > perhaps the scoring can be tweaked to more aggressively favor 5.2 in case of close good SNR. SNR of 25 is not above the current GREAT_SNR (30) definition. Because of that, this happens to be just one dB too large a difference to allow estimated throughput to be considered since abs(snr_b - snr_a) == 5 in this case (that snr=40 gets dropped to GREAT_SNR = 30) and < 5 would have resulted in using the throughput estimate (of which the 5 GHz AP here has significantly higher due to possibility of using VHT80). Taken into account the throughput estimates (which are much newer than the GREAT_SNR definition) are actually assuming the highest rate to be available with SNR of 24, it would sound reasonable to drop the GREAT_SNR value to something like 25. The 30 is already documented as being "a conservative value".. If you (John) want to test the impact of such a change, modify the following line in wpa_supplicant/scan.c to use value 25 instead of 30: #define GREAT_SNR 30 and rebuild wpa_supplicant. -- Jouni Malinen PGP id EFC895FA _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
