Can you try booting with the following kernel boot option: 
nohz=off

This disables the 'tickless' aspect of the tickless kernel (enabled by
default in Gutsy & perhaps other releases). ksoftirqd appears to be
getting bombarded by by requests (probably from not quite fully polished
hardware drivers).

-- 
ksoftirqd eats all cpu
https://bugs.launchpad.net/bugs/49141
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