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  Ubuntu 18.04 - Performance: Radix page fault handler bug in KVM

Status in The Ubuntu-power-systems project:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
  In Progress

Bug description:
  == Comment: #0 - JENIFER HOPPER <> - 2018-02-27 17:25:59 ==
  +++ This bug was initially created as a clone of Bug #165215 +++

  ---Problem Description---
  Paul Mackerras has posted a fix to a Radix page fault handler bug in KVM:
  " KVM: PPC: Book3S HV: Fix handling of large pages in radix page fault 
handler "

  This is critical for P9 KVM performance. Using an open source database 
workload, we saw an 11% throughput improvement with this patch when the guest 
was backed w/ 2MB hugepages. Without this patch, hugepage backing does not help 
performance compared to base page size. 
  ---uname output---
  18.04 lts
  Machine Type = 5104-22C 
  A debugger is not configured
  ---Steps to Reproduce---
    Back guest w/ 2MB pages, run a throughput test and compare performance.
  Contact Information =

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