** Tags added: cscc
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Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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No special request for bionic. Just for 18.10 will be enough.
only one is provided. Other 3 patches are not found. Upstream tested it
that has been fixed.
https://www.spinics.net/lists/kernel/msg2552460.html
commit 8e1a2031e4b556b01ca53cd1fb2d83d811a6605b
Author: Alexey Budankov
Date: Fri Sep
no more work to be done. 18.10 has contained the patch.
git describe 8e1a2031e4b556b01ca53cd1fb2d83d811a6605b
v4.16-rc4-159-g8e1a2031e4b5
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Title:
** 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
Hi @quanxian. What commits are these? Do you want these on bionic 4.15?
Cascardo.
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https://bugs.launchpad.net/bugs/1730782
Title:
[Bug] [KNL] ~5x slowdown of application when
has been fixed in 4.17
** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1730782
Title:
[Bug] [KNL] ~5x slowdown of application when attaching
** 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
** 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
the patch of this bug is under review in upstream. Once update is
official, we will provide patch commit id in this bug. This bug is for
tracking. Thanks for your support.
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** Changed in: intel
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1730782
Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
To manage
** 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
A v9 was posted on August 31st, but there is still no progress upstream.
Meanwhile, Peter Zijlstra merged
0d3d73aac2ff05c78387aa9dcc2c8aa3804405e7 ("perf/core: Rewrite event
timekeeping"), which looks like would have helped with this problem.
Can you confirm if the latest bionic kernel, which has
** Tags added: bionic kernel-da-key
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Title:
[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
To manage notifications about
** 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 =>
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