[ath9k-devel] At high attenuation, tx-rate does not drop low enough?

[Ben Greear <greearb@candelatech.com>]

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 <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com