* [linus:master] [ext4] 1ad0f42823: fio.write_iops 23.8% improvement
@ 2026-04-30 5:38 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-04-30 5:38 UTC (permalink / raw)
To: Zhang Yi
Cc: oe-lkp, lkp, linux-kernel, Theodore Ts'o, Jan Kara,
linux-ext4, oliver.sang
Hello,
kernel test robot noticed a 23.8% improvement of fio.write_iops on:
commit: 1ad0f42823291bcac371dafd37533f5e8d92acc3 ("ext4: move pagecache_isize_extended() out of active handle")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
testcase: fio-basic
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
parameters:
runtime: 300s
disk: 1HDD
fs: ext4
nr_task: 1
test_size: 128G
rw: write
bs: 4k
ioengine: falloc
cpufreq_governor: performance
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260430/202604301021.faab1f8a-lkp@intel.com
=========================================================================================
bs/compiler/cpufreq_governor/disk/fs/ioengine/kconfig/nr_task/rootfs/runtime/rw/tbox_group/test_size/testcase:
4k/gcc-14/performance/1HDD/ext4/falloc/x86_64-rhel-9.4/1/debian-13-x86_64-20250902.cgz/300s/write/lkp-icl-2sp9/128G/fio-basic
commit:
116c0bdac2 ("ext4: remove ctime/mtime update from ext4_alloc_file_blocks()")
1ad0f42823 ("ext4: move pagecache_isize_extended() out of active handle")
116c0bdac2ec059d 1ad0f42823291bcac371dafd375
---------------- ---------------------------
%stddev %change %stddev
\ | \
0.11 ± 5% -0.0 0.08 ± 7% fio.latency_2us%
0.07 ± 3% -0.0 0.05 ± 6% fio.latency_4us%
34.79 -19.1% 28.14 fio.time.elapsed_time
34.79 -19.1% 28.14 fio.time.elapsed_time.max
24.17 -26.0% 17.90 fio.time.system_time
3736 -18.7% 3037 fio.time.voluntary_context_switches
3812 +23.8% 4720 fio.write_bw_MBps
850.67 -22.7% 657.33 fio.write_clat_90%_ns
857.33 -22.4% 665.33 fio.write_clat_95%_ns
872.00 -22.5% 676.00 fio.write_clat_99%_ns
835.45 -22.7% 645.60 fio.write_clat_mean_ns
192.67 ± 28% +122.3% 428.28 ± 20% fio.write_clat_stddev
975889 +23.8% 1208502 fio.write_iops
1.13 -7.7% 1.05 iostat.cpu.system
146867 -17.0% 121930 turbostat.IRQ
2.317e+09 -17.6% 1.908e+09 cpuidle..time
121665 ± 9% -11.5% 107660 ± 5% cpuidle..usage
1.13 -0.1 1.04 mpstat.cpu.all.sys%
0.54 ± 2% +0.1 0.62 ± 2% mpstat.cpu.all.usr%
124.09 ± 2% -6.1% 116.50 uptime.boot
7577 ± 2% -6.3% 7099 uptime.idle
1507 ± 4% +13.8% 1714 vmstat.io.bo
1.58 ± 3% +9.7% 1.73 ± 2% vmstat.procs.r
256506 -3.5% 247467 proc-vmstat.numa_hit
281823 -4.4% 269466 proc-vmstat.pgalloc_normal
166349 -7.9% 153190 proc-vmstat.pgfault
159495 -7.7% 147154 proc-vmstat.pgfree
7811 ± 20% -45.1% 4288 proc-vmstat.pgpgout
7649 -8.2% 7019 ± 2% proc-vmstat.pgreuse
4.74 ± 63% -4.7 0.00 perf-profile.calltrace.cycles-pp.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.acpi_idle_do_entry.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.acpi_safe_halt.acpi_idle_do_entry.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry
3.64 ±104% -3.1 0.56 ±223% perf-profile.calltrace.cycles-pp.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary.common_startup_64
4.95 ± 81% -3.4 1.54 ±149% perf-profile.children.cycles-pp.__split_vma
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.acpi_idle_do_entry
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.acpi_idle_enter
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.acpi_safe_halt
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.cpuidle_enter
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.cpuidle_enter_state
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.cpuidle_idle_call
3.64 ±104% -3.1 0.56 ±223% perf-profile.children.cycles-pp.pv_native_safe_halt
1.82 ±148% +5.8 7.59 ± 39% perf-profile.children.cycles-pp.__mmap_region
1.82 ±148% +6.5 8.34 ± 44% perf-profile.children.cycles-pp.do_mmap
1.82 ±148% +6.5 8.34 ± 44% perf-profile.children.cycles-pp.vm_mmap_pgoff
0.03 ± 7% +21.8% 0.04 ± 4% perf-stat.i.MPKI
0.26 +0.1 0.32 perf-stat.i.branch-miss-rate%
4548711 +21.7% 5537175 perf-stat.i.branch-misses
274432 ± 6% +20.4% 330549 ± 4% perf-stat.i.cache-misses
1860596 +8.1% 2011597 perf-stat.i.cache-references
0.47 +2.1% 0.48 perf-stat.i.cpi
2398 +3.0% 2470 perf-stat.i.minor-faults
2398 +3.0% 2470 perf-stat.i.page-faults
0.03 ± 6% +22.3% 0.04 ± 4% perf-stat.overall.MPKI
0.26 +0.1 0.32 perf-stat.overall.branch-miss-rate%
14.77 ± 6% +1.7 16.46 ± 4% perf-stat.overall.cache-miss-rate%
0.47 +1.8% 0.48 perf-stat.overall.cpi
14177 ± 6% -16.9% 11783 ± 5% perf-stat.overall.cycles-between-cache-misses
2.12 -1.8% 2.08 perf-stat.overall.ipc
8603 -19.7% 6911 perf-stat.overall.path-length
1.69e+09 -1.7% 1.662e+09 perf-stat.ps.branch-instructions
4424559 +21.0% 5353882 perf-stat.ps.branch-misses
267376 ± 6% +19.9% 320480 ± 4% perf-stat.ps.cache-misses
1810896 +7.5% 1947007 perf-stat.ps.cache-references
7.998e+09 -2.0% 7.838e+09 perf-stat.ps.instructions
2334 +2.5% 2393 perf-stat.ps.minor-faults
2334 +2.5% 2393 perf-stat.ps.page-faults
2.887e+11 -19.7% 2.319e+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
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2026-04-30 5:38 [linus:master] [ext4] 1ad0f42823: fio.write_iops 23.8% improvement kernel test robot
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