On 20 July 2016 at 10:51, Sebastian Gottschall <[email protected]> wrote: > Hello > > while hunting a link stability (packet transmission stop) issue i discovered > a maybe cosmetic, but maybe als serious issue. > AP is a QCA9880 3x3 card configured as WDS AP > Station is a QCA9880 2x2 card configured as WDS STA > > the TX rate of the station matches to the rx rate of the AP. > but the RX rate of the station is wrong as it seems which may be a cause of > the issue. > could this be a firmware bug on QCA9880? > > output of fw_stats > > WDS AP: > Peer MAC address 40:a5:ef:85:4d:6f > Peer RSSI 12 > Peer TX rate 175500 > Peer RX rate 175500 > Peer RX duration 0 > > > WDS STA: > Peer MAC address 40:a5:ef:51:49:db > Peer RSSI 13 > Peer TX rate 175500 > Peer RX rate 351000 > Peer RX duration 0
Hmm.. Interesting. FWIW these are "last tx/rx rate". This isn't average nor anything fancy like that. Can you compare that to `iw wlanX station dump`, please? It should report last rx bitrate at least (tx bitrate is broken so don't rely on that). The 175.5 and 351 seem to be both vht mcs index=4 but with differet nss values (1 or 2 spatial streams). I do wonder at what rate frames are actually transmitted OTA. Is this reproducible? Can you try setting a fixed tx bitrate (`iw wlanX set bitrates legacy-5 ht-mcs vht-mcs 1:4` to force vht mcs=4, nss=1) to see if it makes any difference? Perhaps rate-control and tx try-list/status are not parsed properly (for statistical purposes) in firmware which ends up with invalid peer-tx-rate on WDS AP. Michał _______________________________________________ ath10k mailing list [email protected] http://lists.infradead.org/mailman/listinfo/ath10k
