On Thu, Dec 13, 2012 at 12:33:06PM -0800, Luis R. Rodriguez wrote: > On Thu, Dec 13, 2012 at 10:54 AM, Yogesh Powar <yogeshp@xxxxxxxxxxx> wrote: > > Hi Jouni/Luis, > > > > It seems that, we have some resources that can be utilized to test this > > feature of ACS for hostapd. > > > > Before we begin on this work of Luis and optimize/enhance it further, would you > > like to recommend some immediate changes from the last test results? > > By my part: > > The algorithm I wrote was pretty complex and although I did review it > with some folks who liked it and it made sense the algorithm can be > simplified by taking the input elements and using a multiplier for > each one and letting the user configure the multiplier. In other words > all the log stuff I did and linearizing it some way was not all that > necessary except for mental masturbation. > > Apart from that its just a matter of testing and proving it works. Hi Luis, We tried your code of ACS from hostapd mailing list archieve, after resolving some merge conflicts, on latest hostapd. Following are some of our observations a) The code can work for the drivers that dont support offchannel-tx. For such drivers, setting channel_time_tx to zero will make interference factor to depend only on busy time from passive listener's point of view. b) HT 40 Mhz might have some issues with current ACS. When primary channel with least interference factor is selected secondary channel is set to offset from the primary instead of actual secondary channel. Apart from the existing complex logic, explained here http://wireless.kernel.org/en/users/Documentation/acs, can simple scan based ACS algorithm feasible? Lets say one just scans all the channel and gathers the beacons. Based on the information based on collected beacons one can find out which channel has least number of APs residing. One can even look into detail IE informations in the beacons for detail study of wireless environment. This could help drivers that do not have access to parameters needed for interference factor calculation. Thanks Yogesh -- 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
