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Date: Sun, 12 Feb 2023 21:56:03 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Nathan Huckleberry <nhuck@...gle.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>,
Sandeep Dhavale <dhavale@...gle.com>,
Daeho Jeong <daehojeong@...gle.com>,
Eric Biggers <ebiggers@...nel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<ying.huang@...el.com>, <feng.tang@...el.com>,
<zhengjun.xing@...ux.intel.com>, <fengwei.yin@...el.com>,
Nathan Huckleberry <nhuck@...gle.com>,
Tejun Heo <tj@...nel.org>,
Lai Jiangshan <jiangshanlai@...il.com>,
Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] workqueue: Add WQ_SCHED_FIFO
Greeting,
FYI, we noticed a -8.2% regression of stress-ng.kill.ops_per_sec due to commit:
commit: 62640b40b22c774c8b73b9d9a8f285fea233f78c ("[PATCH] workqueue: Add WQ_SCHED_FIFO")
url: https://github.com/intel-lab-lkp/linux/commits/Nathan-Huckleberry/workqueue-Add-WQ_SCHED_FIFO/20230114-050854
base: https://git.kernel.org/cgit/linux/kernel/git/tj/wq.git for-next
patch link: https://lore.kernel.org/all/20230113210703.62107-1-nhuck@google.com/
patch subject: [PATCH] workqueue: Add WQ_SCHED_FIFO
in testcase: stress-ng
on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz (Cascade Lake) with 512G memory
with following parameters:
nr_threads: 10%
disk: 1HDD
testtime: 60s
fs: ext4
class: os
test: kill
cpufreq_governor: performance
If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Link: https://lore.kernel.org/oe-lkp/202302122123.97c4a3d2-oliver.sang@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
sudo bin/lkp install job.yaml # job file is attached in this email
bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
sudo bin/lkp run generated-yaml-file
# if come across any failure that blocks the test,
# please remove ~/.lkp and /lkp dir to run from a clean state.
=========================================================================================
class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
os/gcc-11/performance/1HDD/ext4/x86_64-rhel-8.3/10%/debian-11.1-x86_64-20220510.cgz/lkp-csl-2sp7/kill/stress-ng/60s
commit:
c63a2e52d5 ("workqueue: Fold rebind_worker() within rebind_workers()")
62640b40b2 ("workqueue: Add WQ_SCHED_FIFO")
c63a2e52d5e08f01 62640b40b22c774c8b73b9d9a8f
---------------- ---------------------------
%stddev %change %stddev
\ | \
1579 -8.9% 1439 stress-ng.kill.kill_calls_per_sec
284747 -8.2% 261516 stress-ng.kill.ops
4745 -8.2% 4358 stress-ng.kill.ops_per_sec
622870 -9.5% 563827 stress-ng.time.voluntary_context_switches
0.69 ± 3% -0.0 0.65 ± 3% mpstat.cpu.all.irq%
37785 ± 6% -16.2% 31679 ± 14% turbostat.C1
17763 +8.7% 19302 proc-vmstat.nr_kernel_stack
142968 ± 15% -21.7% 111934 ± 9% proc-vmstat.pgpgout
2170 ± 16% -21.1% 1712 ± 9% vmstat.io.bo
21321 -8.2% 19583 vmstat.system.cs
4794 ± 7% -27.2% 3491 ± 10% sched_debug.cfs_rq:/.load_avg.max
541.58 ± 8% -17.5% 446.78 ± 10% sched_debug.cfs_rq:/.load_avg.stddev
514.00 +9.2% 561.20 ± 5% sched_debug.cfs_rq:/.removed.runnable_avg.max
82.50 ± 28% +34.5% 110.96 ± 10% sched_debug.cfs_rq:/.removed.runnable_avg.stddev
514.00 +9.2% 561.20 ± 5% sched_debug.cfs_rq:/.removed.util_avg.max
82.50 ± 28% +34.5% 110.96 ± 10% sched_debug.cfs_rq:/.removed.util_avg.stddev
0.93 ± 3% -0.0 0.89 ± 2% perf-stat.i.branch-miss-rate%
21969 -8.7% 20060 perf-stat.i.context-switches
0.03 ± 13% -0.0 0.03 ± 6% perf-stat.i.dTLB-load-miss-rate%
296329 ± 12% -17.7% 244025 ± 8% perf-stat.i.dTLB-load-misses
0.03 ± 13% -0.0 0.03 ± 7% perf-stat.overall.dTLB-load-miss-rate%
21632 -8.7% 19751 perf-stat.ps.context-switches
291040 ± 12% -17.7% 239628 ± 8% perf-stat.ps.dTLB-load-misses
39.79 ± 13% -6.6 33.16 ± 16% perf-profile.calltrace.cycles-pp.secondary_startup_64_no_verify
39.67 ± 13% -6.6 33.08 ± 16% perf-profile.calltrace.cycles-pp.cpu_startup_entry.start_secondary.secondary_startup_64_no_verify
39.67 ± 13% -6.6 33.08 ± 16% perf-profile.calltrace.cycles-pp.start_secondary.secondary_startup_64_no_verify
39.66 ± 13% -6.6 33.08 ± 16% perf-profile.calltrace.cycles-pp.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64_no_verify
39.46 ± 13% -6.6 32.89 ± 16% perf-profile.calltrace.cycles-pp.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary.secondary_startup_64_no_verify
38.55 ± 13% -6.5 32.08 ± 17% perf-profile.calltrace.cycles-pp.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary
38.35 ± 13% -6.4 31.91 ± 17% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry
39.79 ± 13% -6.6 33.16 ± 16% perf-profile.children.cycles-pp.secondary_startup_64_no_verify
39.79 ± 13% -6.6 33.16 ± 16% perf-profile.children.cycles-pp.cpu_startup_entry
39.79 ± 13% -6.6 33.16 ± 16% perf-profile.children.cycles-pp.do_idle
39.58 ± 13% -6.6 32.97 ± 16% perf-profile.children.cycles-pp.cpuidle_idle_call
39.67 ± 13% -6.6 33.08 ± 16% perf-profile.children.cycles-pp.start_secondary
38.66 ± 13% -6.5 32.15 ± 17% perf-profile.children.cycles-pp.cpuidle_enter_state
38.66 ± 13% -6.5 32.15 ± 17% perf-profile.children.cycles-pp.cpuidle_enter
0.86 ± 37% -0.3 0.54 ± 20% perf-profile.children.cycles-pp.ktime_get
0.68 ± 34% -0.3 0.41 ± 15% perf-profile.children.cycles-pp.clockevents_program_event
0.12 ± 13% -0.0 0.09 ± 15% perf-profile.children.cycles-pp.exit_to_user_mode_prepare
0.08 ± 12% -0.0 0.05 ± 53% perf-profile.children.cycles-pp.arch_do_signal_or_restart
0.12 ± 11% -0.0 0.09 ± 11% perf-profile.children.cycles-pp.exit_to_user_mode_loop
0.06 -0.0 0.03 ± 81% perf-profile.children.cycles-pp.rcu_sched_clock_irq
0.10 ± 11% -0.0 0.07 ± 10% perf-profile.children.cycles-pp.__schedule
0.78 ± 39% -0.3 0.48 ± 22% perf-profile.self.cycles-pp.ktime_get
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
View attachment "config-6.2.0-rc2-00033-g62640b40b22c" of type "text/plain" (166849 bytes)
View attachment "job-script" of type "text/plain" (8493 bytes)
View attachment "job.yaml" of type "text/plain" (5795 bytes)
View attachment "reproduce" of type "text/plain" (532 bytes)
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