linux-kernel - [linus:master] [x86] 284922f4c5: stress-ng.sockfd.ops_per

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Message-ID: <202511281306.51105b46-lkp@intel.com>
Date: Fri, 28 Nov 2025 14:30:22 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>, Sean Christopherson <seanjc@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>, Mateusz Guzik <mjguzik@...il.com>,
	<oliver.sang@...el.com>
Subject: [linus:master] [x86]  284922f4c5:  stress-ng.sockfd.ops_per_sec 6.1%
 improvement



Hello,

kernel test robot noticed a 6.1% improvement of stress-ng.sockfd.ops_per_sec on:


commit: 284922f4c563aa3a8558a00f2a05722133237fe8 ("x86: uaccess: don't use runtime-const rewriting in modules")
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: sockfd
	cpufreq_governor: performance



Details are as below:
-------------------------------------------------------------------------------------------------->


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251128/202511281306.51105b46-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/sockfd/stress-ng/60s

commit: 
  17d85f33a8 ("Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma")
  284922f4c5 ("x86: uaccess: don't use runtime-const rewriting in modules")

17d85f33a83b84e7 284922f4c563aa3a8558a00f2a0 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
  55674763            +6.1%   59075135        stress-ng.sockfd.ops
    927326            +6.1%     983845        stress-ng.sockfd.ops_per_sec
      3555 ±  3%     +10.6%       3932 ±  3%  perf-c2c.DRAM.remote
      4834 ±  3%     +12.0%       5415 ±  3%  perf-c2c.HITM.local
      2714 ±  2%     +12.5%       3054 ±  3%  perf-c2c.HITM.remote
      0.51            +3.9%       0.53        perf-stat.i.MPKI
  34903541            +5.2%   36715161        perf-stat.i.cache-misses
 1.072e+08            +5.8%  1.133e+08        perf-stat.i.cache-references
     18971            -5.5%      17932        perf-stat.i.cycles-between-cache-misses
      0.46 ± 30%     +13.6%       0.52        perf-stat.overall.MPKI
  31330827 ± 30%     +14.9%   36004895        perf-stat.ps.cache-misses
  96530576 ± 30%     +15.3%  1.113e+08        perf-stat.ps.cache-references
     48.32            -0.2       48.16        perf-profile.calltrace.cycles-pp._raw_spin_lock.unix_del_edges.unix_stream_read_generic.unix_stream_recvmsg.sock_recvmsg
     48.23            -0.2       48.07        perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.unix_del_edges.unix_stream_read_generic.unix_stream_recvmsg
     48.34            -0.2       48.18        perf-profile.calltrace.cycles-pp.unix_del_edges.unix_stream_read_generic.unix_stream_recvmsg.sock_recvmsg.____sys_recvmsg
      0.56 ±  4%      +0.1        0.65 ±  9%  perf-profile.calltrace.cycles-pp.path_openat.do_filp_open.do_sys_openat2.__x64_sys_openat.do_syscall_64
      0.62 ±  3%      +0.1        0.71 ±  8%  perf-profile.calltrace.cycles-pp.do_sys_openat2.__x64_sys_openat.do_syscall_64.entry_SYSCALL_64_after_hwframe.stress_sockfd
      0.56 ±  3%      +0.1        0.65 ±  8%  perf-profile.calltrace.cycles-pp.do_filp_open.do_sys_openat2.__x64_sys_openat.do_syscall_64.entry_SYSCALL_64_after_hwframe
     48.34            -0.2       48.18        perf-profile.children.cycles-pp.unix_del_edges
      0.15 ±  3%      +0.0        0.17 ±  2%  perf-profile.children.cycles-pp.__scm_recv_common
      0.08 ±  7%      +0.0        0.10 ±  7%  perf-profile.children.cycles-pp.lockref_put_return
      0.09 ±  5%      +0.0        0.11 ±  6%  perf-profile.children.cycles-pp.__fput
      0.35 ±  5%      +0.1        0.43 ± 12%  perf-profile.children.cycles-pp.do_open
      0.63 ±  3%      +0.1        0.72 ±  8%  perf-profile.children.cycles-pp.do_sys_openat2
      0.56 ±  3%      +0.1        0.65 ±  8%  perf-profile.children.cycles-pp.do_filp_open




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