** Changed in: intel
Status: Won't Fix => New
** Tags removed: intel-kernel-18.10
** Tags added: intel-kernel-19.04
** Description changed:
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: 18.10
+ Target Release: 19.04
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https://bugs.launchpad.net/bugs/1730782
Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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