On Tue, Mar 29, 2011 at 9:36 AM, Felix Fietkau <n...@openwrt.org> wrote: > On 2011-03-29 3:33 PM, Larry Vaden wrote: >> >> Good morning, ath9k devs and OpenWrt-users. >> >> Please excuse the cross post, not something we normally do. >> >> We have a particularly difficult situation in which we are trying to >> achieve a stable link over 1.2 miles with the Ubiquiti M900 which uses >> the AR9280 and thus 2X2 MIMO. >> >> We loaded OpenWrt trunk as a scientific control when we observed >> spontaneous reboots on AirOS 5.2.1 and 5.3. >> >> There is only one tree in the Fresnel zone and it has few leaves this >> time of year. An unlicensed SCADA operation is a few miles away, >> using omnis at six water towers. >> >> To try to reduce the number of variables, we note with interest >> MikroTik's statement below the sig and ask folks on ath9k-devel and >> OpenWrt-users how to configure, e.g., OpenWrt to use only chain 0. >> >> Excerpts of dmesg for the AP are also below the sig. dmesg on the CPE is >> quiet. >> >> If the objective of this email is unrelated, please offer any advice >> to achieve desired operation. >> >> THANKS in advance for your help --- it is fully appreciated. > > To change the chainmask: > > wifi down > echo 1 > /sys/kernel/debug/ieee80211/phy0/ath9k/rx_chainmask > echo 1 > /sys/kernel/debug/ieee80211/phy0/ath9k/tx_chainmask > wifi > > This might have some side effects as the HT capabilities are not > recalculated (ath9k does not support the antenna control API yet), but it > will configure the PHY to only use one chain, and the rate control is > usually able to deal with that just fine. > > In order to debug this properly, please send a dump of the rate control > stats of both sides: > cat /sys/kernel/debug/ieee80211/phy0/netdev:wlan0/stations/*/rc_stats > > And also a dump of the channel busy time: > iw wlan0 survey dump > > This might help narrow down the cause of this issue. > > - Felix
Felix, You can not know how appreciative this rural ISP is of your reply. To prove Will Rogers was correct about ~ "we're all ignorant, just about different things," do you wish that the chainmask be changed on only the AP or on both the AP and the CPE? kind regards/ldv _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
