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    SubjectRe: [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression
    On Tue, Aug 9, 2016 at 7:33 AM, kernel test robot <xiaolong.ye@intel.com> wrote:
    >
    > FYI, we noticed a -13.6% regression of aim7.jobs-per-min due to commit:
    > 68a9f5e7007c ("xfs: implement iomap based buffered write path")
    >
    > in testcase: aim7
    > on test machine: 48 threads Ivytown Ivy Bridge-EP with 64G memory
    > with following parameters:
    >
    > disk: 1BRD_48G
    > fs: xfs
    > test: disk_wrt
    > load: 3000
    > cpufreq_governor: performance

    Christop, Dave, was this expected?

    From looking at the numbers, it looks like much more IO going on (and
    this less CPU load)..

    > 37.23 ± 0% +15.6% 43.04 ± 0% aim7.time.elapsed_time
    > 37.23 ± 0% +15.6% 43.04 ± 0% aim7.time.elapsed_time.max
    > 6424 ± 1% +31.3% 8432 ± 1% aim7.time.involuntary_context_switches> 4003 ± 0% +28.1% 5129 ± 1% proc-vmstat.nr_active_file
    > 979.25 ± 0% +63.7% 1602 ± 1% proc-vmstat.pgactivate
    > 4699 ± 3% +162.6% 12340 ± 73% proc-vmstat.pgpgout
    > 50.23 ± 19% -27.3% 36.50 ± 17% sched_debug.cpu.cpu_load[1].avg
    > 466.50 ± 29% -51.8% 225.00 ± 73% sched_debug.cpu.cpu_load[1].max
    > 77.78 ± 33% -50.6% 38.40 ± 57% sched_debug.cpu.cpu_load[1].stddev
    > 300.50 ± 33% -52.9% 141.50 ± 48% sched_debug.cpu.cpu_load[2].max
    > 1836 ± 10% +65.5% 3039 ± 8% slabinfo.scsi_data_buffer.active_objs
    > 1836 ± 10% +65.5% 3039 ± 8% slabinfo.scsi_data_buffer.num_objs
    > 431.75 ± 10% +65.6% 715.00 ± 8% slabinfo.xfs_efd_item.active_objs
    > 431.75 ± 10% +65.6% 715.00 ± 8% slabinfo.xfs_efd_item.num_objs

    but what do I know. Those profiles from the robot are pretty hard to
    make sense of.

    Linus

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