** Tags added: kernel
** Information type changed from Proprietary to Public
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1730782
Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
Status in intel:
New
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Triaged
Bug description:
Description:
Workload slows down for default sampling cycles in KNL. There are some
processing in perf that's single threaded and bottlenecked when number of cores
really go up.
A second issue is that things slow down when we issue
perf record – workload
vs
perf record -a – workload
Patch is submitted for review
https://www.spinics.net/lists/kernel/msg2552460.html
https://www.spinics.net/lists/kernel/msg2552461.html
https://www.spinics.net/lists/kernel/msg2552462.html
https://www.spinics.net/lists/kernel/msg2552463.html
Target kernel: TBD
Target Release: 18.04
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