Hello, kernel test robot noticed a 92.5% regression of fileio.latency_95th_ms on: commit: 6a3afb6ac6dfab158ebdd4b87941178f58c8939f ("jbd2: increase the journal IO's priority") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master testcase: fileio test machine: 128 threads 2 sockets Intel(R) Xeon(R) Platinum 8358 CPU @ 2.60GHz (Ice Lake) with 128G memory parameters: period: 600s nr_threads: 100% disk: 1HDD fs: ext4 size: 64G filenum: 1024f rwmode: seqwr iomode: sync 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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-lkp/202401021525.a27b9444-oliver.sang@xxxxxxxxx Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240102/202401021525.a27b9444-oliver.sang@xxxxxxxxx ========================================================================================= compiler/cpufreq_governor/disk/filenum/fs/iomode/kconfig/nr_threads/period/rootfs/rwmode/size/tbox_group/testcase: gcc-12/performance/1HDD/1024f/ext4/sync/x86_64-rhel-8.3/100%/600s/debian-11.1-x86_64-20220510.cgz/seqwr/64G/lkp-icl-2sp5/fileio commit: 8555922721 ("jbd2: correct the printing of write_flags in jbd2_write_superblock()") 6a3afb6ac6 ("jbd2: increase the journal IO's priority") 85559227211020b2 6a3afb6ac6dfab158ebdd4b8794 ---------------- --------------------------- %stddev %change %stddev \ | \ 37.99 ± 9% +92.5% 73.13 fileio.latency_95th_ms 19872 ± 16% -24.1% 15078 ± 21% numa-meminfo.node1.Active(file) 24.74 ± 6% +97.3% 48.81 ± 2% perf-sched.wait_time.avg.ms.kjournald2.kthread.ret_from_fork.ret_from_fork_asm 8157448 -5.7% 7691858 ± 2% proc-vmstat.pgpgout 13464 -5.7% 12700 ± 2% vmstat.io.bo 4968 ± 16% -24.1% 3768 ± 21% numa-vmstat.node1.nr_active_file 4968 ± 16% -24.1% 3768 ± 21% numa-vmstat.node1.nr_zone_active_file 1413 +2.8% 1452 ± 2% perf-stat.i.cycles-between-cache-misses 1.59 -2.9% 1.54 perf-stat.overall.MPKI 1368 +2.5% 1402 perf-stat.overall.cycles-between-cache-misses 161.13 ± 9% +17.4% 189.23 ± 10% sched_debug.cpu.curr->pid.avg 25531 ± 6% -12.4% 22376 ± 8% sched_debug.cpu.nr_switches.stddev -93.66 +38.8% -130.00 sched_debug.cpu.nr_uninterruptible.min 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