According to 
https://wiki.ubuntu.com/ppc64el/Recommendations#Crash_Kernel_recommendations

it looks like the following should be used.
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M

These should be made as defaults for crash on ppc64 at the very least.

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https://bugs.launchpad.net/bugs/1567539

Title:
  Failure to dump with trusty+3.16 on ppc64el

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