** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Yakkety)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => dann frazier (dannf)
** Description changed:
[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
+ [*] https://answers.launchpad.net/~canonical-kernel-
+ team/+archive/ubuntu/unstable/+build/8438034
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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://answers.launchpad.net/~canonical-kernel-
team/+archive/ubuntu/unstable/+build/8438034
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1691614/+subscriptions
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