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X-MS-Exchange-CrossTenant-UserPrincipalName: 9045IMTUS454HFtc88Vgt88E7somaByszGb5s/Ybr6KVN6ry2OpqMJ40iR5Jtevssub9DN2/Z0hYLKIRGKPntQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6437 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 25.9% regression of rt-app.rt-app-thread2-1.wu_lat.average on: commit: 2cc53c6bfe4bd6a39e9420e5b416e43344bb4482 ("sched/rt: Remove default bandwidth control") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git sched/prep testcase: rt-app test machine: 256 threads 2 sockets GENUINE INTEL(R) XEON(R) (Sierra Forest) with 128G memory parameters: workload: spreading-tasks cpufreq_governor: performance If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202408042135.26c3555-oliver.sang@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240804/202408042135.26c3555-oliver.sang@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/rootfs/tbox_group/testcase/workload: gcc-13/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/lkp-srf-2sp1/rt-app/spreading-tasks commit: add53a6969 ("sched/core: Fix picking of tasks for core scheduling with DL server") 2cc53c6bfe ("sched/rt: Remove default bandwidth control") add53a696923bee0 2cc53c6bfe4bd6a39e9420e5b41 ---------------- --------------------------- %stddev %change %stddev \ | \ 0.03 ± 3% +0.0 0.04 ± 5% mpstat.cpu.all.irq% 0.01 ± 11% +0.0 0.01 ± 11% mpstat.cpu.all.soft% 950.00 -100.0% 0.00 sched_debug.rt_rq:.rt_runtime.avg 950.00 -100.0% 0.00 sched_debug.rt_rq:.rt_runtime.max 950.00 -100.0% 0.00 sched_debug.rt_rq:.rt_runtime.min 33.55 ± 16% +37.7% 46.21 ± 12% rt-app.rt-app-thread1-0.period.stddev 137.70 ± 9% +34.2% 184.83 ± 5% rt-app.rt-app-thread1-0.wu_lat.average 30.18 ± 5% +72.0% 51.89 ± 31% rt-app.rt-app-thread2-1.period.stddev 146.41 ± 2% +25.9% 184.29 ± 4% rt-app.rt-app-thread2-1.wu_lat.average 25.19 ± 9% +67.2% 42.11 ± 26% rt-app.rt-app-thread2-1.wu_lat.stddev 10482415 ± 3% +8.7% 11390605 perf-stat.i.cache-references 16774 ± 14% -19.1% 13565 ± 15% perf-stat.i.cycles-between-cache-misses 2.46 -4.5% 2.35 ± 2% perf-stat.i.ipc 0.12 ± 6% +12.5% 0.13 ± 9% perf-stat.overall.MPKI 2.30 -3.9% 2.21 ± 2% perf-stat.overall.ipc 10315907 ± 3% +8.6% 11200002 perf-stat.ps.cache-references 0.54 ± 45% +0.3 0.81 ± 18% perf-profile.calltrace.cycles-pp.sched_balance_find_dst_cpu.select_task_rq_fair.wake_up_new_task.kernel_clone.__do_sys_clone 0.54 ± 45% +0.3 0.81 ± 18% perf-profile.calltrace.cycles-pp.select_task_rq_fair.wake_up_new_task.kernel_clone.__do_sys_clone.do_syscall_64 0.45 ± 71% +0.3 0.79 ± 19% perf-profile.calltrace.cycles-pp.sched_balance_find_dst_group.sched_balance_find_dst_cpu.select_task_rq_fair.wake_up_new_task.kernel_clone 1.20 ± 28% +0.8 2.03 ± 19% perf-profile.calltrace.cycles-pp.update_process_times.tick_nohz_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt 1.31 ± 20% +1.2 2.49 ± 26% perf-profile.calltrace.cycles-pp.tick_nohz_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt 19.35 ± 23% -6.4 12.98 ± 22% perf-profile.children.cycles-pp.get_signal 19.40 ± 23% -6.3 13.12 ± 22% perf-profile.children.cycles-pp.arch_do_signal_or_restart 21.78 ± 18% -5.7 16.12 ± 14% perf-profile.children.cycles-pp.do_exit 21.78 ± 18% -5.7 16.12 ± 14% perf-profile.children.cycles-pp.do_group_exit 0.08 ±141% +0.2 0.24 ± 38% perf-profile.children.cycles-pp.dequeue_task_fair 0.22 ± 54% +0.3 0.50 ± 48% perf-profile.children.cycles-pp.__wp_page_copy_user 0.22 ± 54% +0.3 0.50 ± 48% perf-profile.children.cycles-pp.copy_mc_enhanced_fast_string 0.05 ±145% +0.5 0.60 ± 10% perf-profile.children.cycles-pp.update_rq_clock 0.22 ± 75% +0.6 0.84 ± 60% perf-profile.children.cycles-pp.flush_smp_call_function_queue 4.62 ± 17% +1.6 6.24 ± 10% perf-profile.children.cycles-pp.asm_sysvec_apic_timer_interrupt 0.22 ± 54% +0.3 0.50 ± 48% perf-profile.self.cycles-pp.copy_mc_enhanced_fast_string 0.03 ±223% +0.5 0.56 ± 15% perf-profile.self.cycles-pp.update_rq_clock Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki