[Bug 1812182] Re: Performance degradation with SPECint2017

[Frank Heimes]

And the exact kernel version is also of high interest - I assume the HWE
kernel was used (4.15) and not the GA kernel (4.4)?!

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

** Changed in: ubuntu-z-systems
       Status: New => Incomplete

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Title:
  Performance degradation with SPECint2017

Status in Ubuntu on IBM z Systems:
  Incomplete
Status in gcc-5 package in Ubuntu:
  Incomplete
Status in glibc package in Ubuntu:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Problem description:

  During our Linux distribution performance regression testing, we found
  *significant* performance degradations on Ubuntu 16.04.5 LTS compared
  to other major Linux distributions on s390x when running SPECint2017.
  Some SPECint2017 micro-benchmarks show a performance degradation of
  40%.

  Hardware environment:

  IBM z14, LPAR
  1 IFL, SMT on
  4GiB memory

  Software environment:

  Ubuntu 16.04.5 LTS
  SPECint2017

  Analysis:

  We are currently in the progress of analyzing the problem and will get
  back to this bug as soon as we have more insights.

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