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[Bug 1480349] Re: thermald breaks frequency scaling in Xeon® E5-2687W v3 & E5-1650 v3

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Colin Ian King <1480349@xxxxxxxxxxxxxxxxxx>
Date: Thu, 04 Feb 2016 13:36:49 -0000
Reply-to: Bug 1480349 <1480349@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: thermald (Ubuntu Vivid)
   Importance: Undecided => High

** Changed in: thermald (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: thermald (Ubuntu Vivid)
    Milestone: None => vivid-updates

** Changed in: thermald (Ubuntu Trusty)
    Milestone: None => trusty-updates

** Description changed:

- SRU Justification Wily
+ SRU Justification Wily, Vivid, Trusty
  
  CPU scaling on a class of Intel CPUs is not functioning correctly,
  causing the CPU to be throttled back to the lowest CPU frequency
  
  [FIX]
  Upstream cherry picks, as recommended by Intel
  f4e316ef4d8d8c9a558ef5bfa74e25303c46a985 ("Add white list of the cpu ids")
  18d1574230c6b9b4e8876c0b6739c074a24205e6 ("Move parser init to thd_engine")
  6749427098434ccad81fa8c5f2a3e102fc1644f7 ("Remove wild card for loading")
  ba4fe1e7bb77d09530544cda860fba559603ec83 ("Error recovery when sysfs attrib read fails")
  
  Plus 4 changes to allow clean and simpler patching of the above 4 fix to
  reduce the risk of breaking thermald with a complex backport:
  
  Remove trailing ':' from THD engine failure message
  Remove !! from "No coretemp sysfs found"
  Add new option for config file
  Support target state
  
  Essentially we now have a white list of valid CPUs to run thermald on,
  so we can exclude the issues on a wider class of CPUs.
  
  [TEST CASE]
  With the buggy thermald, CPU is pegged at the lowest CPU frequency.  With the fixed thermald, CPU scaling now works.
  
  [REGRESSION POTENTIAL]
  We are allowing thermald now to run on a strict set of CPUs, so we are hoping that the whitelist covers the class that we can legitimately run thermald against.
  
  --------------------------------------------------------------------------
  
  When I boot with this installed frequency scaling is no longer behaving
  as expected.
  
  It seems that with this installed, the OS loses control of the scaling.
  
  It seems that scaling is performed, though. And very much to the purpose
  of power saving.
  
  Performance is terrible because of this. And I do mean terrible.
  
  The default governor is powersave.
  
  Setting the governor to performance (yes, on all cores) doesn't seem to
  change to scaling behavior. The frequency doesn't pass 800MHz.
  
  I would like to use Intel's microcode updates, but I have to have my CPU
  running at the speed for which it costs so damn much.
  
  Any suggestions?
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: intel-microcode 3.20150121.1
  ProcVersionSignature: Ubuntu 4.1.0-2.2-generic 4.1.3
  Uname: Linux 4.1.0-2-generic x86_64
  ApportVersion: 2.18-0ubuntu5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Jul 31 17:56:39 2015
  InstallationDate: Installed on 2010-10-12 (1753 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  SourcePackage: intel-microcode
  UpgradeStatus: Upgraded to wily on 2014-11-11 (262 days ago)

** No longer affects: intel-microcode (Ubuntu)

** No longer affects: intel-microcode (Ubuntu Trusty)

** No longer affects: intel-microcode (Ubuntu Vivid)

** No longer affects: intel-microcode (Ubuntu Wily)

** No longer affects: intel-microcode (Ubuntu Xenial)

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https://bugs.launchpad.net/bugs/1480349

Title:
  thermald breaks frequency scaling in Xeon® E5-2687W v3 & E5-1650 v3

Status in thermald package in Ubuntu:
  Fix Released
Status in thermald source package in Trusty:
  In Progress
Status in thermald source package in Vivid:
  In Progress
Status in thermald source package in Wily:
  In Progress
Status in thermald source package in Xenial:
  Fix Released

Bug description:
  SRU Justification Wily, Vivid, Trusty

  CPU scaling on a class of Intel CPUs is not functioning correctly,
  causing the CPU to be throttled back to the lowest CPU frequency

  [FIX]
  Upstream cherry picks, as recommended by Intel
  f4e316ef4d8d8c9a558ef5bfa74e25303c46a985 ("Add white list of the cpu ids")
  18d1574230c6b9b4e8876c0b6739c074a24205e6 ("Move parser init to thd_engine")
  6749427098434ccad81fa8c5f2a3e102fc1644f7 ("Remove wild card for loading")
  ba4fe1e7bb77d09530544cda860fba559603ec83 ("Error recovery when sysfs attrib read fails")

  Plus 4 changes to allow clean and simpler patching of the above 4 fix
  to reduce the risk of breaking thermald with a complex backport:

  Remove trailing ':' from THD engine failure message
  Remove !! from "No coretemp sysfs found"
  Add new option for config file
  Support target state

  Essentially we now have a white list of valid CPUs to run thermald on,
  so we can exclude the issues on a wider class of CPUs.

  [TEST CASE]
  With the buggy thermald, CPU is pegged at the lowest CPU frequency.  With the fixed thermald, CPU scaling now works.

  [REGRESSION POTENTIAL]
  We are allowing thermald now to run on a strict set of CPUs, so we are hoping that the whitelist covers the class that we can legitimately run thermald against.

  --------------------------------------------------------------------------

  When I boot with this installed frequency scaling is no longer
  behaving as expected.

  It seems that with this installed, the OS loses control of the
  scaling.

  It seems that scaling is performed, though. And very much to the
  purpose of power saving.

  Performance is terrible because of this. And I do mean terrible.

  The default governor is powersave.

  Setting the governor to performance (yes, on all cores) doesn't seem
  to change to scaling behavior. The frequency doesn't pass 800MHz.

  I would like to use Intel's microcode updates, but I have to have my
  CPU running at the speed for which it costs so damn much.

  Any suggestions?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: intel-microcode 3.20150121.1
  ProcVersionSignature: Ubuntu 4.1.0-2.2-generic 4.1.3
  Uname: Linux 4.1.0-2-generic x86_64
  ApportVersion: 2.18-0ubuntu5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Jul 31 17:56:39 2015
  InstallationDate: Installed on 2010-10-12 (1753 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  SourcePackage: intel-microcode
  UpgradeStatus: Upgraded to wily on 2014-11-11 (262 days ago)

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