I'm trying it in Ubuntu server 11.10 beta kernel 3.0.0-10.

Windows 7 --> Ubuntu server via mount cifs =< 20 % link utilization in windows 
7 task manager
Ubuntu server <-- Windows 7 via samba in explorer => 30 % link utilization in 
windows 7 task manager

General further slowness can be deduced to btrFS now in my case.
Although general disk troughput is very high +100MB/s. Cifs in
combination with btrFS is a big performance hit on Atom CPU. Performance
in cifs is now way better than over sftp.

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https://bugs.launchpad.net/bugs/810606

Title:
  Slow cifs in 11.04

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