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

[Jim Simmons]

My workload is some trading performance tests that I've created, which

aren't  going to help you.  If you can tell me how to revert to a 
previous intel-micrcode

package I can try and come up with some narrow isolated test cases where 
the issue

occurs and send you those.

Thanks,

Jim


On 08/30/2018 05:50 AM, Henrique de Moraes Holschuh wrote:
> 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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