From: kernel test robot <yi1.lai@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: oe-lkp@lists.linux.dev, lkp@intel.com,
linux-kernel@vger.kernel.org, aubrey.li@linux.intel.com,
yu.c.chen@intel.com, yi1.lai@intel.com
Subject: [linus:master] [sched/fair] fb1050ac8e: stress-ng.sleep.ops_per_sec 29.9% regression
Date: Fri, 6 Nov 2026 09:53:05 +0800 [thread overview]
Message-ID: <202611060925.fb5500b1-lkp@intel.com> (raw)
Hello,
kernel test robot noticed a 29.9% regression of stress-ng.sleep.ops_per_sec on:
commit: fb1050ac8e40aaa014291b5b53612d27890c2b09 ("sched/fair: Change the default cgroup_mode to concur")
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: sleep
cpufreq_governor: performance
In addition to that, the commit also has significant impact on the following tests:
+------------------+---------------------------------------------------------------------------------------------+
| testcase: change | netperf: netperf.Throughput_Mbps -15.9% regression |
| test machine | 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory |
| test parameters | cluster=cs-localhost |
| | cpufreq_governor=performance |
| | ip=ipv4 |
| | nr_threads=200% |
| | runtime=300s |
| | test=TCP_STREAM |
+------------------+---------------------------------------------------------------------------------------------+
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/202611060925.fb5500b1-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20261106/202611060925.fb5500b1-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/sleep/stress-ng/60s
commit:
507f910a4e ("sched/fair: Add cgroup_mode: tasks")
fb1050ac8e ("sched/fair: Change the default cgroup_mode to concur")
507f910a4e1f140a fb1050ac8e40aaa014291b5b536
---------------- ---------------------------
%stddev %change %stddev
\ | \
96108453 -29.9% 67358809 stress-ng.sleep.ops
1599640 -29.9% 1120640 stress-ng.sleep.ops_per_sec
46082447 -29.1% 32658369 ± 2% stress-ng.time.involuntary_context_switches
15699 -11.3% 13918 stress-ng.time.percent_of_cpu_this_job_got
6459 -4.7% 6156 stress-ng.time.system_time
3034 -25.5% 2262 stress-ng.time.user_time
2.16e+09 -30.6% 1.5e+09 stress-ng.time.voluntary_context_switches
***************************************************************************************************
lkp-srf-2sp3: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory
=========================================================================================
cluster/compiler/cpufreq_governor/ip/kconfig/nr_threads/rootfs/runtime/tbox_group/test/testcase:
cs-localhost/gcc-14/performance/ipv4/x86_64-rhel-9.4/200%/debian-13-x86_64-20250902.cgz/300s/lkp-srf-2sp3/TCP_STREAM/netperf
commit:
507f910a4e ("sched/fair: Add cgroup_mode: tasks")
fb1050ac8e ("sched/fair: Change the default cgroup_mode to concur")
507f910a4e1f140a fb1050ac8e40aaa014291b5b536
---------------- ---------------------------
%stddev %change %stddev
\ | \
3415 -15.9% 2871 netperf.ThroughputBoth_Mbps
1311602 -15.9% 1102665 netperf.ThroughputBoth_total_Mbps
3415 -15.9% 2871 netperf.Throughput_Mbps
1311602 -15.9% 1102665 netperf.Throughput_total_Mbps
3.906e+08 ± 2% -63.2% 1.439e+08 ± 2% netperf.time.involuntary_context_switches
184303 -3.2% 178397 netperf.time.minor_page_faults
11296 +1.6% 11478 netperf.time.percent_of_cpu_this_job_got
33938 +2.0% 34626 netperf.time.system_time
444.02 ± 2% -27.5% 321.87 ± 2% netperf.time.user_time
425106 ± 27% -48.3% 219585 ± 12% netperf.time.voluntary_context_switches
3.002e+09 -15.9% 2.524e+09 netperf.workload
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
reply other threads:[~2026-11-06 1:53 UTC|newest]
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