[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL

Hi @quanxian. What commits are these? Do you want these on bionic 4.15?

Cascardo.

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Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL

Status in intel:
Fix Released
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: 5.2
Target Release: 19.04

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