Greeting, We noticed a +8.2% improvement of vm-scalability.throughput due to commit: commit: 0610cbb3c679ad9cac6297f6bc7b6a780ef08c55 ("xfs: allow writeback on pages without buffer heads") git://git.infradead.org/users/hch/xfs xfs-iomap-write.6 in testcase: vm-scalability on test machine: 80 threads Skylake with 64G memory with following parameters: runtime: 300s size: 1T test: msync-mt cpufreq_governor: performance test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us. test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/ Details are as below: --------------------------------------------------------------------------------------------------> ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/runtime/size/test/cpufreq_governor: lkp-skl-2sp2/vm-scalability/debian-x86_64-2018-04-03.cgz/x86_64-rhel-7.2/gcc-7/300s/1T/msync-mt/performance commit: 954c5d1f8f6c0c96ac7c804017dd4990de0a3211 0610cbb3c679ad9cac6297f6bc7b6a780ef08c55 954c5d1f8f6c0c96 0610cbb3c679ad9cac6297f6bc ---------------- -------------------------- %stddev %change %stddev \ | \ 22918424 +8.2% 24793308 ± 3% vm-scalability.throughput 287516 +9.3% 314334 ± 3% vm-scalability.median 0.06 ± 10% +63.1% 0.10 ± 33% vm-scalability.median_stddev 0.06 ± 13% +68.0% 0.10 ± 32% vm-scalability.stddev 442.91 ± 2% -0.1% 442.59 ± 13% vm-scalability.time.elapsed_time 442.91 ± 2% -0.1% 442.59 ± 13% vm-scalability.time.elapsed_time.max 257174 ± 99% +3059.5% 8125542 ±171% vm-scalability.time.file_system_inputs 1.999e+08 ± 2% +6.9% 2.138e+08 ± 8% vm-scalability.time.file_system_outputs 2958834 ± 3% +5.9% 3132103 vm-scalability.time.involuntary_context_switches 5428 ± 86% +143.0% 13193 ± 38% vm-scalability.time.major_page_faults 32828702 +0.0% 32829407 vm-scalability.time.maximum_resident_set_size 1.656e+08 ± 4% -24.2% 1.255e+08 vm-scalability.time.minor_page_faults 4096 +0.0% 4096 vm-scalability.time.page_size 3142 -11.1% 2793 ± 11% vm-scalability.time.percent_of_cpu_this_job_got 5703 ± 2% -16.7% 4752 ± 4% vm-scalability.time.system_time 8213 ± 2% -9.6% 7426 vm-scalability.time.user_time 1.687e+08 ± 4% -5.3% 1.597e+08 ± 20% vm-scalability.time.voluntary_context_switches 8.864e+09 +0.0% 8.864e+09 vm-scalability.workload 4.96e+08 -1.2% 4.9e+08 interrupts.CAL:Function_call_interrupts 23.41 ± 3% +15.0% 26.91 ± 14% boot-time.boot 14.35 +19.2% 17.10 ± 22% boot-time.dhcp 1745 ± 4% +13.9% 1987 ± 16% boot-time.idle 14.71 +18.9% 17.48 ± 22% boot-time.kernel_boot 37.80 ± 3% +4.0 41.83 ± 14% mpstat.cpu.idle% 22.17 ± 6% +0.7 22.90 ± 10% mpstat.cpu.iowait% 0.00 ± 18% +0.0 0.00 ± 33% mpstat.cpu.soft% 17.40 -2.7 14.72 ± 11% mpstat.cpu.sys% 22.63 -2.1 20.54 ± 12% mpstat.cpu.usr% 6043 ±109% -8.1% 5553 ± 45% softirqs.NET_RX 1406677 ± 4% -3.8% 1352948 ± 18% softirqs.RCU 7347397 ± 2% -5.8% 6918912 ± 8% softirqs.SCHED 6460 ±102% -7.3% 5987 ± 42% softirqs.TASKLET 15084260 ± 3% +0.8% 15201176 ± 19% softirqs.TIMER 7.038e+09 ± 2% -5.5% 6.648e+09 ± 15% cpuidle.C1.time 1.959e+08 ± 3% -7.2% 1.817e+08 ± 18% cpuidle.C1.usage 7.082e+09 ± 5% +4.1% 7.376e+09 ± 5% cpuidle.C1E.time 17864428 ± 3% -2.3% 17455835 ± 2% cpuidle.C1E.usage 6.39e+09 ± 7% +29.4% 8.265e+09 ± 39% cpuidle.C6.time 6558906 ± 7% +28.8% 8450687 ± 39% cpuidle.C6.usage 1.369e+08 ± 3% -4.2% 1.312e+08 ± 17% cpuidle.POLL.time 3774992 ± 4% -6.2% 3540929 ± 20% cpuidle.POLL.usage vm-scalability.throughput 2.9e+07 +-+---------------------------------------------------------------+ | O | 2.8e+07 +-+ | 2.7e+07 O-+ O O O O O | | O O O O O O | 2.6e+07 +-O O O O O O O O O O | 2.5e+07 +-+ O O O | | O O O | 2.4e+07 +-+ | 2.3e+07 +-+ +. + .+.+.| |.+ : +.. +. .. + .+. .+. | 2.2e+07 +-++ +. : +. .+. .+..+. + +.+ + + | 2.1e+07 +-+ +.. + +.+.+.. .+. : + + + | | + + + | 2e+07 +-+---------------------------------------------------------------+ [*] bisect-good sample [O] bisect-bad sample 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. Thanks, Xiaolong