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rt2800usb (rt2x00) in ad-hoc mode stalls when transferring large amount of data

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Hello

I have a Ralink 3071 usb device (Bus 002 Device 003: ID 07b8:3071
D-Link Corp. 802.11n/b/g Mini Wireless LAN USB2.0 Adapter).
I am using the mac80211 driver by compiling the compat-wireless
tarball from yesterday (10 March). I cross compile it with the 2.6.24
kernel in a Montavista distribution (and also with 2.6.27 in Fedora)

It works pretty good in AP mode using HostAPD and DCHP and I get
relative good transfer rates (up to 3.5 MBytes per second).

My problems are with Ad-Hoc connections. I can configure the Ad-Hoc
connection, for example:

iwconfig wlan0 mode ad-hoc
iwconfig wlan0 essid my_ad_hoc_nt
iwconfig wlan0 key 1122334455
ifconfig wlan0 192.168.111.44 up

It works and I connect to it on the other end (a windows machine with
a compatible static ip address), however, it only works for doing
small data transfer rate things like browsing through the directories
of a shared folder or retrieving web pages from a web server. When I
try to do something like transferring a 500 MByte file, it starts
transferring, reaches a peak and then it drops to 0 again. After that,
the file is no longer transferred and I cannot do anything else (can't
ping).

Is this a known issue? Any ideas?

Juan Carlos
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