As mentioned, once I do "ifconfig eth0 down", the problems stop. Once I
do "ifconfig eth0 up", they start again.

powertop reports between:

99.2 ms/s       0.0        kWork          e1000_watchdog_task
and 
393.2 ms/s       0.1        kWork          e1000_watchdog_task

While the network interface is completely idle (well, it doesn't work)!

The curious thing is that it used to work but it has broken recently in
Ubuntu 11.10.

Btw, please see #779753 - a probably related bug.

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https://bugs.launchpad.net/bugs/887793

Title:
  Kworker constantly taking about 100% CPU

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