group.of.nepali.translators team mailing list archive

[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

Public bug reported:

[Impact]
Performance is lowered for ARM >= v8.1 cpus by not taking advantage of the "Large System Extenstion" atomic instructions they provide.

Note: This config was enabled during xenial development, but was
disabled to workaround a FTBFS[*] due to us not having a new enough
binutils to support it. binutils was later updated in xenial, and
supports these instructions.

[Test Case]
TBD

[Regression Risk]
There is a known small performance overhead for <= ARMv8.1 arm64 systems (noted in the Kconfig).
[...TBD...]


[*] https://launchpadlibrarian.net/229977996/buildlog_ubuntu-xenial-arm64.linux_4.4.0-0.5_BUILDING.txt.gz

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Yakkety)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Zesty)
     Importance: Undecided
         Status: Incomplete

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

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

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

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https://bugs.launchpad.net/bugs/1691614

Title:
  please enable CONFIG_ARM64_LSE_ATOMICS

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Incomplete
Status in linux source package in Yakkety:
  Incomplete
Status in linux source package in Zesty:
  Incomplete

Bug description:
  [Impact]
  Performance is lowered for ARM >= v8.1 cpus by not taking advantage of the "Large System Extenstion" atomic instructions they provide.

  Note: This config was enabled during xenial development, but was
  disabled to workaround a FTBFS[*] due to us not having a new enough
  binutils to support it. binutils was later updated in xenial, and
  supports these instructions.

  [Test Case]
  TBD

  [Regression Risk]
  There is a known small performance overhead for <= ARMv8.1 arm64 systems (noted in the Kconfig).
  [...TBD...]

  
  [*] https://launchpadlibrarian.net/229977996/buildlog_ubuntu-xenial-arm64.linux_4.4.0-0.5_BUILDING.txt.gz

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