** 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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1730782 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: 4.17 Target Release: 18.10 To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1730782/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
