Messages in this thread | | | From | Linus Torvalds <> | Date | Wed, 10 Aug 2016 11:24:16 -0700 | Subject | Re: [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression |
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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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