group.of.nepali.translators team mailing list archive

[Seth Forshee <seth.forshee+lp@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1606147

Title:
  [APL][SAUCE] Slow system response time due to a monitor bug

Status in HWE Next:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

  We've found a bug on some Apollo Lake system makes it runs very slow.
  From upstream it is caused by following reason:

  "Monitored cached line may not wake up from mwait on certain Goldmont
  based CPUs. This patch will avoid calling
  current_set_polling_and_test() and thereby not set the TIF_ flag. The
  result is that we'll always send IPIs for wakeups."

  [Fix]

  Upstream already provided a workaround[1] to fix this problem. This
  patches haven't been merged in latest(v4.7) release but already in
  linux-next.

  To fix this issue in Xenial it also needs another commit introduces
  macros use in the workaround:

  commit 970442c599b22ccd644ebfe94d1d303bf6f87c05
  Author: Dave Hansen <dave@xxxxxxxx>
  Date:   Thu Jun 2 17:19:27 2016 -0700

      x86/cpu/intel: Introduce macros for Intel family numbers

  This workaround checks CPU families and certain features, so no
  further regressions is expected

  [1]: https://lkml.org/lkml/2016/7/6/469

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