kernel-packages team mailing list archive

[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Public bug reported:

We have a hodge podge of CONFIG_NO_HZ_IDLE and CONFIG_NO_HZ_FULL
selected across the architectures.  From the documentation for
CONFIG_NO_HZ_FULL this option does not even do anything positive until
the user supplied a CPU list on the kernel command line, and it incurs a
significant overhead overall.  From the docs we should commonise on
CONFIG_NO_HZ_IDLE, and separately evaluate the overhead.

** Affects: linux (Ubuntu)
     Importance: Medium
     Assignee: Andy Whitcroft (apw)
         Status: Confirmed

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

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Andy Whitcroft (apw)

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https://bugs.launchpad.net/bugs/1413968

Title:
  CONFIG_NO_HZ_IDLE should be the default

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  We have a hodge podge of CONFIG_NO_HZ_IDLE and CONFIG_NO_HZ_FULL
  selected across the architectures.  From the documentation for
  CONFIG_NO_HZ_FULL this option does not even do anything positive until
  the user supplied a CPU list on the kernel command line, and it incurs
  a significant overhead overall.  From the docs we should commonise on
  CONFIG_NO_HZ_IDLE, and separately evaluate the overhead.

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