[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** Tags added: cscc -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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 8 11:47:03 2017 +0300 perf/cor: Use RB trees for pinned/flexible groups Change event groups into RB trees sorted by CPU and then by a 64bit index, so that multiplexing hrtimer interrupt handler would be able skipping to the current CPU's list and ignore groups allocated for the other CPUs. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
no more work to be done. 18.10 has contained the patch. git describe 8e1a2031e4b556b01ca53cd1fb2d83d811a6605b v4.16-rc4-159-g8e1a2031e4b5 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** 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: 5.2 + Target kernel: 4.17 Target Release: 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: 4.17 - Target Release: 19.04 + Target Release: 18.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
has been fixed in 4.17 ** Changed in: intel Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** 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 kernel: 5.2 Target Release: 19.04 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** 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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** Changed in: intel Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** 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: 18.04 + Target Release: 18.10 ** Tags added: intel-kernel-18.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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 this commit,
scales better? If not, what is the plan of pushing this forward
upstream?
Cascardo.
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[Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
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[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** Tags added: bionic kernel-da-key -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1730782] Re: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL
** 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1730782 Title: [Bug] [KNL] ~5x slowdown of application when attaching by perf on KNL To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
