From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Date: Thu, 04 Oct 2012 15:29:57 -0700 Subject: [ath9k-devel] At high attenuation, tx-rate does not drop low enough? Message-ID: <506E0DE5.8030104@candelatech.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org More fun with attenuation and ath9k: It seems that the tx-rates do not properly go to lower speeds, at least in some cases. I enabled lots of attenuation, and it gets into a state where the station drops rates down to around 100Mbps, but the AP side stays with high tx-rate. From sniffing, it seems that STA starts sending ARPs to AP, and AP responds, but packet is never received on the STA. I *do* see lots of rx-crc errors on the station. If I force the rate to be MCS-0, then it runs just fine. I haven't yet tried forcing it to run at higher rates. This is kernel 3.5.5+...any ideas on what parts of the code need poking at to figure out why it doesn't decrease the tx-rate? Station 00:0e:8e:32:12:cf (on vap0) inactive time: 2048 ms rx bytes: 3145942974 rx packets: 2145073 tx bytes: 3392161604 tx packets: 5245999 tx retries: 30925 tx failed: 882 signal: -77 dBm signal avg: -76 dBm tx bitrate: 360.0 MBit/s MCS 21 40Mhz short GI Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com