poor WLAN throughput in only one direction

[Matthias Apitz]

Hello,

I have some laptops and servers in my WLAN/LAN, all connected to the
same router and same subnet 192.168.2.x; they all run the same
12.0-CURRENT r314251 amd64:

The following NICs are involved:

Acer C720:  WLAN ath0: AR9460 mac 640.2 RF5110 phy 2456.12
Dell e6330: WLAN rtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
Dell r210:  LAN  bce0: <QLogic NetXtreme II BCM5716 1000Base-T

The transfer rate between them for a gzip'ed file transfer with scp are:

r210  --> C720    1.7MB/s
e6330 --> r210    1.8MB/s

but:

e6330 --> C720    120KB/s, ... 30KB/s

What can I check to resolve the poor rate from the e6330 to the C720?
The other direction i.e. from C720 to e6330 is fine.

Thanks

	matthias
-- 
Matthias Apitz, ✉ guru at unixarea.de, ⌂ http://www.unixarea.de/  ☎ +49-176-38902045