From: kernel test robot <yi1.lai@intel.com>
To: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Phil Auld <pauld@redhat.com>,
aubrey.li@linux.intel.com, yu.c.chen@intel.com,
yi1.lai@intel.com
Subject: [linus:master] [sched/core] 118a2cf4ce: stress-ng.schedpolicy.ops_per_sec 14.1% regression
Date: Fri, 23 Oct 2026 19:49:20 +0800 [thread overview]
Message-ID: <202610231954.51716452-lkp@intel.com> (raw)
Hello,
kernel test robot noticed a 14.1% regression of stress-ng.schedpolicy.ops_per_sec on:
commit: 118a2cf4ced60777a2408001e2b4838fed1cea55 ("sched/core: Call wakeup_preempt() for queued tasks during class change") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: schedpolicy
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 <yi1.lai@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202610231954.51716452-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261023/202610231954.51716452-lkp@intel.com
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-spr-r02/schedpolicy/stress-ng/60s
commit:
v7.3-rc7
118a2cf4ce ("sched/core: Call wakeup_preempt() for queued tasks during class change")
v7.3-rc7 118a2cf4ced60777a2408001e2b
---------------- ---------------------------
%stddev %change %stddev
\ | \
246.24 -14.1% 211.56 stress-ng.schedpolicy.SCHED_BATCH_schedules_per_sec
246.24 -14.1% 211.56 stress-ng.schedpolicy.SCHED_DEADLINE_schedules_per_sec
246.24 -14.1% 211.55 stress-ng.schedpolicy.SCHED_FIFO_schedules_per_sec
246.23 -14.1% 211.55 stress-ng.schedpolicy.SCHED_OTHER_schedules_per_sec
246.24 -14.1% 211.56 stress-ng.schedpolicy.SCHED_RR_schedules_per_sec
16540375 -14.1% 14210394 stress-ng.schedpolicy.ops
275785 -14.1% 236940 stress-ng.schedpolicy.ops_per_sec
85768 ± 3% +734.4% 715671 ± 2% stress-ng.time.involuntary_context_switches
32443 ± 2% +13.9% 36955 ± 2% stress-ng.time.minor_page_faults
21807 -10.3% 19559 stress-ng.time.percent_of_cpu_this_job_got
13087 -10.3% 11737 stress-ng.time.system_time
78783 ± 2% +634.5% 578684 stress-ng.time.voluntary_context_switches
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
next reply other threads:[~2026-10-23 11:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-23 11:49 kernel test robot [this message]
2026-10-23 16:14 ` [linus:master] [sched/core] 118a2cf4ce: stress-ng.schedpolicy.ops_per_sec 14.1% regression Paul E. McKenney
2026-10-23 17:00 ` Peter Zijlstra
2026-10-23 18:51 ` Paul E. McKenney
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