On Wed, Jul 18, 2012 at 1:56 PM, Bastian Bittorf <bittorf@xxxxxxxxxxxxxx> wrote: > hi devs! > > yesterday we had a breaktrough debugging b43 in our hackspace maschinenraum/m18[1,2] > at weimar.freifunk.net[3,4] - since a long time our darling wrt54g suffers from a > hanging wifi and bad performance[5], but the workaround is easy: now it's up to > you to fix the rootcause. > > our testsetup, where we could _reproduce_ reliably a stopping TX is like this: > > laptop ---lan--- "A"-wrt54g/adhoc ~~~ air ~~~ "B"-anyrouter/adhoc > > now make a testdownload with the laptop from B. > wireless will stop working after ~10 seconds. > > wifi up will reanimate and our freifunk-cron.minutely-check > will do this automagically. (read further, this is not the solution) > > we tried to limit the rateset to e.g. lower rates, but this does NOT change > the behaviour. what works is: define a rateset on BOTH router which makes > it impossible to change the band, e.g.: > > iw dev $WIFIDEV set bitrates legacy-2.4 1 2 5.5 11 > OR > iw dev $WIFIDEV set bitrates legacy-2.4 6 9 12 18 24 36 48 54 > > now we had a great performance, 10 Gigabytes of wireless transfer, > no stopping TX anymore and an empty box of beer. three things to do now: > > 1) why does a band change (can be seen through minstrel) is a problem? Because IIRC b43 doesn't support anything other than 2.4GHz at all. > > 2) we have to make in config-option to force a band, or a rateset: > e.g. uci set wireless.radio0.hwmode=11g > e.g. uci set wireless.radio0.bitrates='6 9 12 18 24 36 48 54' > > 3) spread to word: > there is a great frustration in the community about b43, > but the old drivers _have_ to die, it's about time - really. > > thanks for your work, > bye storchi, andi, bastian + m18 crew > > [1] http://blog.maschinenraum.tk/ > [2] http://blog.maschinenraum.tk/2012/07/15/bitcoin-vending-machine-exchange-euro-coins-for-bitcoin-wallets/ > [3] http://wireless.subsignal.org > [4] http://wireless.subsignal.org/index.php?title=Main_Page_en > [5] https://dev.openwrt.org/ticket/7552 > > -- > 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 -- Vista: [V]iruses, [I]ntruders, [S]pyware, [T]rojans and [A]dware. :-) -- 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
