[linus:master] [bpf] f18b03faba: stress-ng.seccomp.ops_per_sec -2.0% regression

[linus:master] [bpf] f18b03faba: stress-ng.seccomp.ops_per_sec -2.0% regression

[kernel test robot]

Hello,

kernel test robot noticed a -2.0% regression of stress-ng.seccomp.ops_per_sec on:


commit: f18b03fabaa9b7c80e80b72a621f481f0d706ae0 ("bpf: Implement BPF exceptions")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

testcase: stress-ng
test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 128G memory
parameters:

	nr_threads: 1
	disk: 1HDD
	testtime: 60s
	fs: ext4
	class: os
	test: seccomp
	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/202311231458.61e2502f-oliver.sang@intel.com


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231123/202311231458.61e2502f-oliver.sang@intel.com

=========================================================================================
class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
  os/gcc-12/performance/1HDD/ext4/x86_64-rhel-8.3/1/debian-11.1-x86_64-20220510.cgz/lkp-csl-d02/seccomp/stress-ng/60s

commit: 
  335d1c5b54 ("bpf: Implement support for adding hidden subprogs")
  f18b03faba ("bpf: Implement BPF exceptions")

335d1c5b545284d7 f18b03fabaa9b7c80e80b72a621 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
     13890 ±  7%      -9.4%      12579 ±  3%  turbostat.POLL
      0.01 ± 13%     +48.4%       0.01 ± 16%  perf-sched.sch_delay.avg.ms.syslog_print.do_syslog.kmsg_read.vfs_read
      0.01 ± 11%     +70.3%       0.01 ± 16%  perf-sched.sch_delay.max.ms.syslog_print.do_syslog.kmsg_read.vfs_read
      0.78 ± 23%      -0.2        0.55 ± 11%  mpstat.cpu.all.irq%
      0.05 ± 17%      -0.0        0.03 ± 12%  mpstat.cpu.all.soft%
      2.39 ±  8%      +0.3        2.65 ±  2%  mpstat.cpu.all.sys%
     27256            -2.0%      26712        stress-ng.seccomp.ops
    454.26            -2.0%     445.19        stress-ng.seccomp.ops_per_sec
     54565            -1.9%      53516        stress-ng.time.voluntary_context_switches
      7.07 ±  4%      -1.7        5.36 ± 11%  perf-profile.calltrace.cycles-pp.emit_mov_imm32.do_jit.bpf_int_jit_compile.bpf_prog_select_runtime.bpf_prepare_filter
      6.01 ±  5%      -1.4        4.64 ± 10%  perf-profile.children.cycles-pp.emit_mov_imm32
      0.21 ± 15%      -0.0        0.16 ± 15%  perf-profile.children.cycles-pp.mod_objcg_state
      4.91 ±  5%      -1.0        3.90 ± 10%  perf-profile.self.cycles-pp.emit_mov_imm32
   3921440            -2.3%    3831836        proc-vmstat.numa_hit
   3921405            -2.3%    3829327        proc-vmstat.numa_local
  19214848            -2.1%   18810333        proc-vmstat.pgalloc_normal
  19165012            -2.1%   18760451        proc-vmstat.pgfree
    116766 ±  8%      -6.0%     109716        proc-vmstat.pgreuse
     25902            -2.0%      25381        proc-vmstat.thp_fault_alloc
      1.73 ± 59%      -1.3        0.48 ± 41%  perf-stat.i.branch-miss-rate%
  23564234 ±  2%      -5.6%   22236469        perf-stat.i.cache-references
    331079 ± 18%     -27.3%     240834 ±  9%  perf-stat.i.dTLB-load-misses
      0.07 ± 45%      -0.0        0.03 ± 26%  perf-stat.i.dTLB-store-miss-rate%
     53.82 ±  4%      -4.7       49.17        perf-stat.i.iTLB-load-miss-rate%
    679766 ±  6%     +11.1%     755158        perf-stat.i.iTLB-loads
      9620 ±  7%     +13.6%      10932 ±  2%  perf-stat.i.instructions-per-iTLB-miss
      2454 ±  2%      +4.3%       2560        perf-stat.overall.cycles-between-cache-misses
      0.03 ±  6%      -0.0        0.03 ±  2%  perf-stat.overall.dTLB-store-miss-rate%
     52.10            -2.3       49.76        perf-stat.overall.iTLB-load-miss-rate%
      9654 ±  3%      +6.5%      10286        perf-stat.overall.instructions-per-iTLB-miss
  23233597 ±  2%      -5.8%   21887967        perf-stat.ps.cache-references
    326645 ± 18%     -27.4%     237090 ±  9%  perf-stat.ps.dTLB-load-misses
    669939 ±  6%     +10.9%     743269        perf-stat.ps.iTLB-loads
 4.987e+11            -3.2%  4.829e+11        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

Re: [linus:master] [bpf] f18b03faba: stress-ng.seccomp.ops_per_sec -2.0% regression

[Kumar Kartikeya Dwivedi]

On Fri, 24 Nov 2023 at 01:41, kernel test robot <oliver.sang@intel.com> wrote:
>
>
>
> Hello,
>
> kernel test robot noticed a -2.0% regression of stress-ng.seccomp.ops_per_sec on:
>

Interesting. I'll take a look and investigate.
Thanks

>
> [...]