From: kernel test robot <oliver.sang@intel.com>
To: Askar Safin <safinaskar@gmail.com>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
Christian Brauner <brauner@kernel.org>,
<linux-fsdevel@vger.kernel.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-api@vger.kernel.org>,
<oliver.sang@intel.com>
Subject: [linux-next:master] [vmsplice] e2c0b23680: stress-ng.vm-splice.vm-splice_calls_per_sec 10.2% regression
Date: Thu, 11 Jun 2026 14:23:52 +0800 [thread overview]
Message-ID: <202606111018.cc992614-lkp@intel.com> (raw)
Hello,
kernel test robot noticed a 10.2% regression of stress-ng.vm-splice.vm-splice_calls_per_sec on:
commit: e2c0b2368081bef7d1f6758cc9e7edde8521237c ("vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
[still regression on linux-next/master 6e845bcb78c95af935094040bd4edc3c2b6dd784]
testcase: stress-ng
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:
nr_threads: 100%
testtime: 60s
test: vm-splice
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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202606111018.cc992614-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260611/202606111018.cc992614-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-srf-2sp3/vm-splice/stress-ng/60s
commit:
a9f7db50ed ("tee: fs/splice.c: remove unused parameter "flags" from "link_pipe"")
e2c0b23680 ("vmsplice: make vmsplice a trivial wrapper for preadv2/pwritev2")
a9f7db50ed2fff96 e2c0b2368081bef7d1f6758cc9e
---------------- ---------------------------
%stddev %change %stddev
\ | \
2122 -2.7% 2064 stress-ng.time.user_time
13281641 -10.2% 11928183 stress-ng.vm-splice.MB_per_sec_vm-splice_rate
1.183e+10 -4.8% 1.126e+10 stress-ng.vm-splice.ops
1.972e+08 -4.8% 1.878e+08 stress-ng.vm-splice.ops_per_sec
3.4e+09 -10.2% 3.054e+09 stress-ng.vm-splice.vm-splice_calls_per_sec
1397 ± 7% -21.1% 1103 ± 10% sched_debug.cfs_rq:/.runnable_avg.max
1.28 -22.1% 1.00 ± 44% turbostat.IPC
74419 +3.9% 77317 proc-vmstat.nr_shmem
633806 +1.1% 640727 proc-vmstat.numa_local
331878 ± 13% -30.3% 231247 ± 18% numa-numastat.node0.local_node
37379 ± 76% +241.6% 127705 ± 50% numa-numastat.node0.other_node
298829 ± 14% +36.1% 406730 ± 10% numa-numastat.node1.local_node
162072 ± 17% -55.7% 71783 ± 89% numa-numastat.node1.other_node
332129 ± 13% -30.4% 231269 ± 18% numa-vmstat.node0.numa_local
37379 ± 76% +241.6% 127705 ± 50% numa-vmstat.node0.numa_other
298881 ± 14% +36.1% 406833 ± 10% numa-vmstat.node1.numa_local
162072 ± 17% -55.7% 71783 ± 89% numa-vmstat.node1.numa_other
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:[~2026-06-11 6:24 UTC|newest]
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