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Message-ID: <202510281337.398a9aa9-lkp@intel.com>
Date: Tue, 28 Oct 2025 14:25:53 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Eric Dumazet <edumazet@...gle.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
Jakub Kicinski <kuba@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>,
<netdev@...r.kernel.org>, <oliver.sang@...el.com>
Subject: [linus:master] [net] 16c610162d: netperf.Throughput_tps 17.2%
regression
Hello,
kernel test robot noticed a 17.2% regression of netperf.Throughput_tps on:
commit: 16c610162d1f1c332209de1c91ffb09b659bb65d ("net: call cond_resched() less often in __release_sock()")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[still regression on linus/master dcb6fa37fd7bc9c3d2b066329b0d27dedf8becaa]
[still regression on linux-next/master 8fec172c82c2b5f6f8e47ab837c1dc91ee3d1b87]
testcase: netperf
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory
parameters:
ip: ipv4
runtime: 300s
nr_threads: 200%
cluster: cs-localhost
test: TCP_CRR
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 <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202510281337.398a9aa9-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251028/202510281337.398a9aa9-lkp@intel.com
=========================================================================================
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_CRR/netperf
commit:
abfa70b380 ("Merge branch 'tcp-__tcp_close-changes'")
16c610162d ("net: call cond_resched() less often in __release_sock()")
abfa70b380348cf4 16c610162d1f1c332209de1c91f
---------------- ---------------------------
%stddev %change %stddev
\ | \
2.80 -0.4 2.43 ± 3% mpstat.cpu.all.usr%
199581 ± 96% -75.4% 49072 ± 64% numa-meminfo.node0.Mapped
6583442 ± 6% -30.2% 4594175 ± 5% numa-numastat.node0.local_node
6709344 ± 6% -30.4% 4672973 ± 5% numa-numastat.node0.numa_hit
50277 ± 96% -75.4% 12383 ± 63% numa-vmstat.node0.nr_mapped
6708267 ± 6% -30.3% 4672365 ± 5% numa-vmstat.node0.numa_hit
6582364 ± 6% -30.2% 4593568 ± 5% numa-vmstat.node0.numa_local
224.83 ±100% +224.8% 730.17 ± 36% perf-c2c.DRAM.local
1438 ±100% +132.4% 3343 ± 11% perf-c2c.DRAM.remote
1569 ±100% +115.5% 3383 ± 10% perf-c2c.HITM.local
1089 ±100% +121.1% 2408 ± 10% perf-c2c.HITM.remote
14776381 ± 9% -21.6% 11587148 ± 8% proc-vmstat.numa_hit
14576750 ± 9% -21.9% 11387471 ± 8% proc-vmstat.numa_local
51492399 ± 6% -26.1% 38054262 ± 5% proc-vmstat.pgalloc_normal
48277971 ± 5% -26.9% 35310227 ± 5% proc-vmstat.pgfree
2874230 -17.2% 2379822 netperf.ThroughputBoth_total_tps
7484 -17.2% 6197 netperf.ThroughputBoth_tps
2874230 -17.2% 2379822 netperf.Throughput_total_tps
7484 -17.2% 6197 netperf.Throughput_tps
1.351e+09 -13.7% 1.165e+09 netperf.time.involuntary_context_switches
9145 +7.8% 9855 netperf.time.percent_of_cpu_this_job_got
27055 +8.4% 29322 netperf.time.system_time
927.87 -11.1% 824.49 netperf.time.user_time
1.975e+08 ± 5% -28.2% 1.418e+08 ± 6% netperf.time.voluntary_context_switches
8.623e+08 -17.2% 7.139e+08 netperf.workload
7908218 ± 8% +33.3% 10540980 ± 7% sched_debug.cfs_rq:/.avg_vruntime.stddev
2.27 -10.2% 2.04 sched_debug.cfs_rq:/.h_nr_queued.avg
11.92 ± 7% -18.9% 9.67 ± 8% sched_debug.cfs_rq:/.h_nr_queued.max
2.33 ± 5% -13.6% 2.02 ± 4% sched_debug.cfs_rq:/.h_nr_queued.stddev
5.14 ± 27% -50.8% 2.53 ± 51% sched_debug.cfs_rq:/.load_avg.min
7908224 ± 8% +33.3% 10540996 ± 7% sched_debug.cfs_rq:/.min_vruntime.stddev
245718 ± 4% -10.4% 220184 ± 8% sched_debug.cpu.max_idle_balance_cost.stddev
2.26 -10.2% 2.03 sched_debug.cpu.nr_running.avg
2.33 ± 5% -13.8% 2.01 ± 4% sched_debug.cpu.nr_running.stddev
8021905 -16.0% 6738879 sched_debug.cpu.nr_switches.avg
10163286 -20.5% 8082726 ± 2% sched_debug.cpu.nr_switches.max
1494738 ± 14% -50.1% 745542 ± 9% sched_debug.cpu.nr_switches.stddev
6.417e+10 -16.1% 5.383e+10 perf-stat.i.branch-instructions
0.52 -0.0 0.49 perf-stat.i.branch-miss-rate%
3.329e+08 -21.1% 2.628e+08 perf-stat.i.branch-misses
49601635 ± 8% -15.1% 42090142 ± 6% perf-stat.i.cache-misses
2.238e+08 -11.6% 1.979e+08 ± 2% perf-stat.i.cache-references
10160912 -15.7% 8567209 perf-stat.i.context-switches
1.74 +20.0% 2.09 perf-stat.i.cpi
2679 ± 7% -22.9% 2067 ± 3% perf-stat.i.cpu-migrations
12544 ± 7% +17.2% 14707 ± 5% perf-stat.i.cycles-between-cache-misses
3.464e+11 -16.3% 2.898e+11 perf-stat.i.instructions
0.58 -16.4% 0.49 perf-stat.i.ipc
52.92 -15.7% 44.62 perf-stat.i.metric.K/sec
0.52 -0.0 0.49 perf-stat.overall.branch-miss-rate%
1.74 +19.4% 2.07 perf-stat.overall.cpi
12209 ± 8% +17.3% 14320 ± 6% perf-stat.overall.cycles-between-cache-misses
0.58 -16.3% 0.48 perf-stat.overall.ipc
122980 +1.1% 124361 perf-stat.overall.path-length
6.398e+10 -16.1% 5.367e+10 perf-stat.ps.branch-instructions
3.319e+08 -21.1% 2.62e+08 perf-stat.ps.branch-misses
49465671 ± 8% -15.1% 41971976 ± 6% perf-stat.ps.cache-misses
2.231e+08 -11.6% 1.973e+08 ± 2% perf-stat.ps.cache-references
10129507 -15.7% 8540638 perf-stat.ps.context-switches
2669 ± 7% -22.8% 2061 ± 3% perf-stat.ps.cpu-migrations
3.454e+11 -16.3% 2.89e+11 perf-stat.ps.instructions
1.06e+14 -16.3% 8.879e+13 perf-stat.total.instructions
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
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