[linus:master] [btrfs] b7fdfd29a1: postmark.transactions 9.5% regression

[kernel test robot <oliver.sang@intel.com>]

Hello,

kernel test robot noticed a 9.5% regression of postmark.transactions on:


commit: b7fdfd29a136a17c5c8ad9e9bbf89c48919c3d19 ("btrfs: only set the device specific options after devices are opened")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


we are in fact not sure what's the connection between this change and the
postmark.transactions performance. still report out due to below checks.

[still regression on      linus/master 4bb1f7e19c4a1d6eeb52b80acff5ac63edd1b91d]
[regression chould be solved by reverting this commit on linus/master head]
[still regression on linux-next/master 72fb0170ef1f45addf726319c52a0562b6913707]

testcase: postmark
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory
parameters:

	disk: 1HDD
	fs: btrfs
	fs1: nfsv4
	number: 4000n
	trans: 10000s
	subdirs: 100d
	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/202510271449.efa21738-lkp@intel.com


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


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251027/202510271449.efa21738-lkp@intel.com

=========================================================================================
compiler/cpufreq_governor/disk/fs1/fs/kconfig/number/rootfs/subdirs/tbox_group/testcase/trans:
  gcc-14/performance/1HDD/nfsv4/btrfs/x86_64-rhel-9.4/4000n/debian-13-x86_64-20250902.cgz/100d/lkp-cpl-4sp2/postmark/10000s

commit: 
  53a4acbfc1 ("btrfs: fix memory leak on duplicated memory in the qgroup assign ioctl")
  b7fdfd29a1 ("btrfs: only set the device specific options after devices are opened")

53a4acbfc1de85fa b7fdfd29a136a17c5c8ad9e9bbf 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
      2010           +10.5%       2222        nfsstat.Client.nfs.v4.open_noat
     97983 ± 11%     +18.5%     116101        numa-numastat.node1.other_node
     97983 ± 11%     +18.5%     116101        numa-vmstat.node1.numa_other
     16001 ±  5%      -7.5%      14797 ±  5%  sched_debug.cfs_rq:/.load.avg
   1474354 ±  3%      +9.9%    1620281 ±  4%  sched_debug.cpu.avg_idle.avg
    756151 ±  3%     +10.0%     831539 ±  4%  sched_debug.cpu.max_idle_balance_cost.avg
      3585            -2.6%       3490        perf-stat.i.context-switches
      6141 ±  2%      +4.0%       6385        perf-stat.i.cycles-between-cache-misses
      5796 ±  2%      +3.9%       6024        perf-stat.overall.cycles-between-cache-misses
      3580            -2.6%       3486        perf-stat.ps.context-switches
 9.548e+11            +7.3%  1.025e+12        perf-stat.total.instructions
    136494            +4.3%     142419        proc-vmstat.nr_inactive_file
    136494            +4.3%     142419        proc-vmstat.nr_zone_inactive_file
   2784208            +4.8%    2917180        proc-vmstat.numa_hit
   2435763            +5.5%    2568673        proc-vmstat.numa_local
   3042276            +5.1%    3196281        proc-vmstat.pgalloc_normal
   2627503            +6.9%    2808220        proc-vmstat.pgfault
   2754381            +5.4%    2903034        proc-vmstat.pgfree
     97857            +6.3%     104058        proc-vmstat.pgreuse
      9.80            -9.4%       8.88        postmark.creation_mixed_trans
    112312            -7.0%     104473        postmark.data_read
    203502            -7.0%     189298        postmark.data_written
      9.80            -9.4%       8.88        postmark.deletion_mixed_trans
      9.73            -9.5%       8.80        postmark.files_appended
     12.59            -7.0%      11.70        postmark.files_created
     12.59            -7.0%      11.70        postmark.files_deleted
      9.87            -9.5%       8.93        postmark.files_read
    715.35            +7.5%     768.93        postmark.time.elapsed_time
    715.35            +7.5%     768.93        postmark.time.elapsed_time.max
     51508            -1.6%      50690        postmark.time.voluntary_context_switches
     19.61            -9.5%      17.75        postmark.transactions




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