On Thu, Jul 21, 2011 at 8:13 PM, MingAnn Ng <devil_eddie01@xxxxxxxxxxx> wrote: > Hi Luis, > > I am thinking of using the ACS application for channel selection on IBSS > network. I had run a test with the current git. But the result is not so > convincing. > > 10 surveys for 2412 MHz: 11.382248 12.847997 13.223471 13.403065 > 13.454694 13.529891 12.556324 13.573309 13.616969 13.645601 > 10 surveys for 2417 MHz: 12.678072 10.299560 -inf -inf 9.678072 -inf -inf > -inf -inf -inf > 10 surveys for 2422 MHz: -inf -inf -inf -inf -inf -inf -inf -inf -inf > -inf > 10 surveys for 2427 MHz: -inf -inf 12.192645 -inf -inf -inf -inf -inf > -inf -inf > 10 surveys for 2432 MHz: -inf 9.192645 12.777608 12.192645 12.192645 -inf > 12.192645 -inf 10.093109 12.192645 > 10 surveys for 2437 MHz: 11.192645 -inf 11.000000 10.093109 10.093109 > 11.192645 -inf 11.192645 -inf -inf > 10 surveys for 2442 MHz: 10.192645 10.093109 -inf 10.061401 11.192645 > -inf -inf -inf 11.192645 10.093109 > 10 surveys for 2447 MHz: -inf -inf -inf 11.777608 -inf 10.192645 -inf > -inf -inf -inf > 10 surveys for 2452 MHz: 11.192645 -inf -inf 11.192645 -inf -inf -inf > 13.777608 11.337035 10.830075 > 10 surveys for 2457 MHz: 10.192645 -inf -inf -inf -inf -inf -inf -inf > -inf -inf > 10 surveys for 2462 MHz: 9.540568 9.192645 10.283793 8.476438 -inf -inf > -inf -inf 10.192645 -inf > 10 surveys for 2467 MHz: -inf -inf -inf -inf -inf -inf 9.752072 -inf -inf > -inf > 10 surveys for 2472 MHz: -inf -inf 10.192645 -inf -inf -inf -inf -inf > 7.714598 -inf > 10 surveys for 5180 MHz: 2.000000 1.830075 1.000000 0.678072 2.000000 > 2.000000 2.000000 0.678072 2.000000 2.000000 > 10 surveys for 5200 MHz: 2.000000 1.678072 2.000000 2.000000 2.000000 > 2.000000 1.678072 2.000000 0.678072 0.678072 > 10 surveys for 5220 MHz: 2.000000 1.415037 2.000000 0.000000 2.000000 > 2.000000 1.678072 2.000000 2.000000 2.000000 > 10 surveys for 5240 MHz: 3.000000 3.000000 3.000000 1.245112 3.000000 > 3.000000 3.000000 2.678072 2.000000 3.000000 > 10 surveys for 5260 MHz: 3.000000 2.000000 3.000000 3.000000 3.000000 > 3.000000 2.000000 2.678072 2.000000 2.678072 > 10 surveys for 5280 MHz: 3.000000 1.415037 3.000000 1.415037 1.678072 > 2.000000 1.245112 3.000000 3.000000 2.678072 > 10 surveys for 5300 MHz: 3.000000 3.000000 3.000000 1.415037 3.000000 > 3.000000 3.000000 2.000000 3.000000 3.000000 > 10 surveys for 5320 MHz: 3.000000 3.000000 3.000000 3.000000 3.000000 > 2.678072 3.000000 1.415037 3.000000 2.000000 > 10 surveys for 5500 MHz: -1.000000 -2.000000 -1.000000 -2.321928 > -1.321928 -1.321928 -1.000000 -2.321928 -1.000000 -2.459432 > 10 surveys for 5520 MHz: -2.392317 -1.169925 -1.169925 -0.807355 > -1.906891 -1.169925 -1.169925 -1.169925 -1.700440 -0.807355 > 10 surveys for 5540 MHz: -1.169925 -2.643856 -1.169925 -2.087463 > -1.169925 -1.169925 -2.523562 -1.169925 -1.169925 -1.169925 > 10 surveys for 5560 MHz: -1.169925 -1.169925 -2.643856 -1.169925 > -1.321928 -1.169925 -1.459432 -1.700440 -2.087463 -1.169925 > 10 surveys for 5580 MHz: -1.169925 -1.700440 -1.169925 -1.906891 > -1.321928 -1.169925 -1.169925 -1.169925 -1.169925 -1.169925 > 10 surveys for 5600 MHz: -1.169925 -1.169925 -1.169925 -2.643856 > -0.807355 -2.459432 -1.459432 -1.169925 -1.169925 -1.169925 > 10 surveys for 5620 MHz: -1.169925 -1.321928 -2.087463 -1.169925 > -1.169925 -1.321928 -0.807355 -2.392317 -1.169925 -1.169925 > 10 surveys for 5640 MHz: -2.643856 -1.321928 -1.169925 -2.857981 > -1.169925 -0.584963 -1.169925 -1.169925 -1.169925 -3.643856 > 10 surveys for 5660 MHz: -2.169925 -1.584963 -2.169925 -2.857981 > -1.169925 -1.169925 -1.169925 -1.169925 -1.459432 -1.169925 > 10 surveys for 5680 MHz: -1.169925 -1.169925 -2.643856 -2.700440 > -1.169925 -1.169925 -1.169925 -1.169925 -0.807355 -1.700440 > 10 surveys for 5700 MHz: -2.087463 -1.169925 -1.169925 -1.000000 > -2.459432 -1.169925 -1.169925 -1.169925 -1.169925 -1.169925 > 2412 MHz: 13.123357 > 2417 MHz: -inf > 2422 MHz: -inf > 2427 MHz: -inf > 2432 MHz: -inf > 2437 MHz: -inf > 2442 MHz: -inf > 2447 MHz: -inf > 2452 MHz: -inf > 2457 MHz: -inf > 2462 MHz: -inf > 2467 MHz: -inf > 2472 MHz: -inf > 5180 MHz: 1.618622 > 5200 MHz: 1.671229 > 5220 MHz: 1.709311 > 5240 MHz: 2.692318 > 5260 MHz: 2.635614 > 5280 MHz: 2.243133 > 5300 MHz: 2.741504 > 5320 MHz: 2.709311 > 5500 MHz: -1.574714 > 5520 MHz: -1.346398 > 5540 MHz: -1.544436 > 5560 MHz: -1.506274 > 5580 MHz: -1.311873 > 5600 MHz: -1.438962 > 5620 MHz: -1.378062 > 5640 MHz: -1.690221 > 5660 MHz: -1.609185 > 5680 MHz: -1.487164 > 5700 MHz: -1.373637 > Ideal freq: 2417 MHz > > > The ideal channel is 2417MHz. But there are many interference in 2.4G at my > testing place. the result for that channel is -inf. Right.. > I did not understand the > outcome, maybe you can describe about -infinity and why that this result > occurs. Sure, so -inf means the calculation resulted in a value out of bounds by the used data type. The issue lies in the wide range of values that we run into for analysis in very noisy environments. One alternative I considered was to use __float128 instead of long double for the interference_factor but I was unable to figure out how to print these correctly. > will it be causing by scanning time for particular channel is too > short? Can you test with the latest ACS patches I posted for hostapd with debugging and see the values you get there? Luis -- 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
