Hi Bruno and all,

talking about distance tests - if you did that in 802.11a or g, there is 
problem with ack timeouts and slottimes - in madwifi it has to be 
adjusted manually for longer distances, and from my experience with 
ath5k there are problems with acks even when distance is 0,5m, so maybe 
txpower is not the problem here, or not the only problem. I will do some 
more tests and let you know, from what i already made :

madwifi as ap, ath5k as sta, ff off, bursting off, 802.11a , various 
tests with fixed rate to 18 ,24,36,48 and some with rate auto on both 
sides.  Distance about 30cms. Used cards - CM10 in minipci2pci holder. 
RSSI on madwifi side of about 40db, jumping to 60db occasionaly. Maximum 
throughtput has been on rate auto n both sides, in the best case it has 
been 24,3Mb/s in iperf TCP test. Madwifi2madwifi has been able to do 
about 33Mb/s in average in same conditions, and about 54Mb/s on channel 
152 in turboa mode. Main difference between madwifi2madwifi and 
madwifi2ath5k has been, that, when watchng stats on madwifi side of link 
- athstats -i wifi0 1 - in case of madwifi2ath5k i have seen 2x more  
input frames that output frames. On madwifi2madwifi both sides has been 
about the same - with small fluctuations. From that fact i think there  
could be some problem with acks. Will study it a bit - recently haven't 
had much time for this - and report more.

Pavel
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