What specific kernel version had the problem?  You can check with:

uname -a


The CONFIG_NO_HZ_FULL kernel param was turned off at some point between 
trusty's 3.13 and xenial's 4.4, and without that kernel param enabled the 
nohz_full boot param has no effect.

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https://bugs.launchpad.net/bugs/1587265

Title:
  ubuntu not work with tickless kernel boot option

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