[Bug 1789719] Re: severe performance issue after intel-microcode update

[Henrique de Moraes Holschuh]

I am afraid you need to disclose a _lot_ more information about your
workload for us to even have an idea how you'd hit such an extreme
slowdown effect...

Also, what mitigation modes have you enabled in the kernel, etc.

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https://bugs.launchpad.net/bugs/1789719

Title:
  severe performance issue after intel-microcode update

Status in intel-microcode package in Ubuntu:
  New

Bug description:
  After upgrading my intel-microcode package to
  3.20180807a.0ubuntu0.16.04.1 the performance for some test code that I
  have has worsened by 400-500%.  Chip is an i7-3960X.

  lsb_release -rd
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04

  apt-cache policy intel-microcode
  intel-microcode:
    Installed: 3.20180807a.0ubuntu0.16.04.1
    Candidate: 3.20180807a.0ubuntu0.16.04.1
    Version table:
   *** 3.20180807a.0ubuntu0.16.04.1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
          100 /var/lib/dpkg/status
       3.20151106.1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/restricted

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