** 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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