> > 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. > Using: --- wpa_supplicant/scan.c.orig 2017-02-16 13:39:16.809997441 +0000 +++ wpa_supplicant/scan.c 2017-02-16 13:39:53.536663769 +0000 @@ -1738,7 +1738,7 @@ * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a * conservative value. */ -#define GREAT_SNR 30 +#define GREAT_SNR 25 #define IS_5GHZ(n) (n > 4000) I now get: Sorted scan results a0:55:4f:66:d5:10 freq=5240 qual=0 noise=-92~ level=-67 snr=25* flags=0xb age=0 est=390001IEs a0:55:4f:66:d5:18 freq=2447 qual=0 noise=-89~ level=-53 snr=36* flags=0xb age=0 est=65000IEs ..and connect to the 5GHz channel. Thanks :) _______________________________________________ Hostap mailing list Hostap@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/hostap
