Gábor Stefanik wrote: > On Thu, Apr 16, 2009 at 3:11 PM, Nick Kossifidis <mickflemm@xxxxxxxxx> wrote: > >> 2009/4/16 Hans Maes <Hans@xxxxxxxxx>: >> >>> Hello, >>> >>> I'm not sure this is the correct place to ask my question, but I've been >>> searching on google for ages now and can't seem to find an answer so I'm >>> asking it here. >>> If not, please yell at me and tell me where to go whine instead ;-) >>> >>> I'm using CM11 a/b/g cards with the Atheros AR5414A Chip, which have 2 >>> antenna connectors. >>> I only have 1 antenna connected to the MAIN connector. >>> Running a self compiled 2.6.29 kernel on a few debian lenny boxes with ath5k >>> module for the wireless cards, set up in mesh mode. >>> Seems to work fine on the test bench, but behaves rather poorly in >>> production environment. >>> Everything related to the mesh network setup seems to work, but I have about >>> 40% - 60% packet loss on the entire netwerk (about 15 nodes) >>> >>> I'm guessing this has something to do with the antenna diversity setting. >>> >>> Can anybody tell me how to tell the ath5k module to disable antenna >>> diversity and only use the MAIN antenna ? >>> >>> If this is a RTFM thingie, then I apologize, I just can't seem to find it >>> anywhere. >>> >>> Please reply to my personal e-mail address as well, I'm not subscribed to >>> the list. >>> >>> Thanks for your help. >>> >>> Regards, >>> >>> Hans >>> >> After this patch... >> https://lists.ath5k.org/pipermail/ath5k-devel/2009-April/002264.html >> >> It's possible to tell the driver to use one fixed antenna (in your >> case its fixed antenna A). Just change... >> ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_DEFAULT); >> >> with >> ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_FIXED_A); >> >> we will have a better way to change this in the future ;-) >> > > I wonder if just exporting that as a modparam is a good-enough > choice... though perhaps the best solution would be something like "iw > phy phy0 antenna 1 up/down". Or perhaps we should make antenna > diversity depend on the PCI ID, defaulting to 1 antenna when diversity > support cannot be determined. > > modparam seems somewhat broken, thinking of multiple wireless cards... My feature request would be to allow setup fixed txantenna only for broadcast/multicast frames. I think it would work for almost all setups, even if only one antenna connector is used, as diversity logic will naturally handle unicast frames right. Or did I miss something? BTW: is it theoretically possible to turn off RX antenna diversity, and what would be the potential gain? Best regards, Arnd -- 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
