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Slow receive with rtl8192cu (usb ew-7811Un)

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I'm seeing very slow receive rates (~63kb/s) with an EW-7811Un USB
adapter which appears to load the rtl8192cu driver.  Is that a known
problem?

I'm currently running the Debian 2.6.39-rc7-amd64 kernel from unstable;
I believe rc7 may be the first Debian kernel to work with this adapter.

I also needed to patch Debian's firmware-realtek package to include the
relevant firmware as detailed here:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=625614.

With respect to the connection quality I see:

  Channel:1
  Frequency:2.412 GHz (Channel 1)
  Quality=65/70  Signal level=-45 dBm  

And during transfers "iw event -t" shows nothing other than the
occasional scan started/finished pair.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2002-11-03 14DD 432F AE39 534D B592 F9A0 25C8 D377 8C7E 73A4
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