[Bug 1812182] Re: Performance degradation with SPECint2017

[Christian Ehrhardt ]

Thanks for the heads up, sounds very interesting!

I know you said you are still analyzing, so I'll wait ... so many
questions in my mind already :-)

But one thing to check up front - which gcc version are you using on
this test on Ubuntu and which one on the systems you compare?

** Also affects: glibc (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gcc-5 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: gcc-5 (Ubuntu)
       Status: New => Incomplete

** Changed in: glibc (Ubuntu)
       Status: New => Incomplete

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Changed in: glibc (Ubuntu)
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

** Changed in: gcc-5 (Ubuntu)
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

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https://bugs.launchpad.net/bugs/1812182

Title:
  Performance degradation with SPECint2017

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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