I built Xenial and Artful test kernels with the patch sets provided in
comments #2 and #4.  The test kernels can be downloaded from:


Can you test this kernel and see if it resolves this bug?

Note, to test this kernel, you need to install both the linux-image and
linux-image-extra .deb packages.

Thanks in advance!

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  artful: rfi-flush: Switch to new linear fallback flush

Status in The Ubuntu-power-systems project:
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Status in linux source package in Artful:

Bug description:
  Change flush from congruence-first with dependencies to linear with
  no dependencies, which increases flush performance by 8x on P8, and
  3x on P9 (as measured with null syscall loop, which will have the
  flush area in the L2).

  The flush also becomes simpler and more adaptable to different cache

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