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Message-ID: <20161019015400.GA343@yexl-desktop>
Date:   Wed, 19 Oct 2016 09:54:00 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Yuchung Cheng <ycheng@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org
Subject: [lkp] [tcp]  3613b3dbd1:  netpipe.bigger_5M_Mbps.avg -5.5% regression


FYI, we noticed a -5.5% regression of netpipe.bigger_5M_Mbps.avg due to commit:

commit 3613b3dbd1ade9a6a626dae1f608c57638eb5e8a ("tcp: prepare skbs for better sack shifting")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

in testcase: netpipe
on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 4 -m 6G
with following parameters:

	test: tcp
	cluster: cs-localhost

NetPIPE is a protocol independent performance tool that encapsulates the best of ttcp and netperf and visually represents the network performance under a variety of conditions.


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.

Details are as below:
-------------------------------------------------------------------------------------------------->


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml

=========================================================================================
cluster/compiler/kconfig/rootfs/tbox_group/test/testcase:
  cs-localhost/gcc-6/x86_64-rhel-7.2/debian-x86_64-2016-08-31.cgz/vm-lkp-a08/tcp/netpipe

commit: 
  e812bd905a (" wireless-drivers-next patches for 4.9")
  3613b3dbd1 ("tcp: prepare skbs for better sack shifting")

e812bd905a5cf00f 3613b3dbd1ade9a6a626dae1f6 
---------------- -------------------------- 
       fail:runs  %reproduction    fail:runs
           |             |             |    
         %stddev     %change         %stddev
             \          |                \  
      2427 ±  0%      -5.5%       2294 ±  0%  netpipe.bigger_5M_Mbps.avg
      1764 ±  1%      +5.0%       1853 ±  0%  netpipe.time.elapsed_time
      1764 ±  1%      +5.0%       1853 ±  0%  netpipe.time.elapsed_time.max
     84.75 ±  0%      -2.1%      83.00 ±  0%  netpipe.time.percent_of_cpu_this_job_got
      1497 ±  1%      +3.2%       1546 ±  0%  netpipe.time.system_time
   1378335 ±  1%     +28.6%    1772455 ±  1%  netpipe.time.voluntary_context_switches
     14140 ±  3%      +6.6%      15079 ±  2%  interrupts.CAL:Function_call_interrupts
    393.25 ±  2%     -29.1%     279.00 ±  2%  slabinfo.kmalloc-2048.active_objs
    412.00 ±  1%     -32.3%     279.00 ±  2%  slabinfo.kmalloc-2048.num_objs
      4069 ±  0%     +17.5%       4779 ±  0%  vmstat.system.cs
      2961 ±  0%      +5.3%       3118 ±  0%  vmstat.system.in
    229439 ± 94%   +6926.4%   16121408 ±172%  latency_stats.avg.max
    141971 ±160%  +11239.9%   16099418 ±172%  latency_stats.avg.nfs_wait_on_request.nfs_writepage_setup.nfs_updatepage.nfs_write_end.generic_perform_write.nfs_file_write.__vfs_write.vfs_write.SyS_write.entry_SYSCALL_64_fastpath
     90183 ±153%     -55.4%      40178 ± 84%  latency_stats.avg.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
    839.25 ± 21%   +1114.0%      10188 ±125%  latency_stats.avg.rpc_wait_bit_killable.__rpc_execute.rpc_execute.rpc_run_task.nfs4_call_sync_sequence.[nfsv4]._nfs4_proc_lookup.[nfsv4].nfs4_proc_lookup_common.[nfsv4].nfs4_proc_lookup.[nfsv4].nfs_lookup.lookup_slow.walk_component.path_lookupat
    414419 ± 86%   +7661.1%   32163484 ±172%  latency_stats.max.max
    257867 ±166%  +12362.7%   32137192 ±172%  latency_stats.max.nfs_wait_on_request.nfs_writepage_setup.nfs_updatepage.nfs_write_end.generic_perform_write.nfs_file_write.__vfs_write.vfs_write.SyS_write.entry_SYSCALL_64_fastpath
     81137 ±155%     -94.7%       4265 ± 45%  latency_stats.max.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
     90183 ±153%     -55.4%      40178 ± 84%  latency_stats.max.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
    839.25 ± 21%   +1114.0%      10188 ±125%  latency_stats.max.rpc_wait_bit_killable.__rpc_execute.rpc_execute.rpc_run_task.nfs4_call_sync_sequence.[nfsv4]._nfs4_proc_lookup.[nfsv4].nfs4_proc_lookup_common.[nfsv4].nfs4_proc_lookup.[nfsv4].nfs_lookup.lookup_slow.walk_component.path_lookupat
      6232 ± 87%    -100.0%       0.00 ± -1%  latency_stats.sum.call_rwsem_down_read_failed.__do_page_fault.trace_do_page_fault.do_async_page_fault.async_page_fault.skb_copy_datagram_iter.tcp_rcv_established.tcp_v4_do_rcv.tcp_prequeue_process.tcp_recvmsg.inet_recvmsg.sock_recvmsg
      1107 ± 62%    +964.9%      11788 ± 55%  latency_stats.sum.call_rwsem_down_read_failed.proc_pid_cmdline_read.__vfs_read.vfs_read.SyS_read.do_syscall_64.return_from_SYSCALL_64
    276091 ±166%  +11542.5%   32143926 ±172%  latency_stats.sum.nfs_wait_on_request.nfs_writepage_setup.nfs_updatepage.nfs_write_end.generic_perform_write.nfs_file_write.__vfs_write.vfs_write.SyS_write.entry_SYSCALL_64_fastpath
     97392 ±128%     -82.9%      16660 ± 29%  latency_stats.sum.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
     90183 ±153%     -55.4%      40178 ± 84%  latency_stats.sum.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
    839.25 ± 21%   +1114.0%      10188 ±125%  latency_stats.sum.rpc_wait_bit_killable.__rpc_execute.rpc_execute.rpc_run_task.nfs4_call_sync_sequence.[nfsv4]._nfs4_proc_lookup.[nfsv4].nfs4_proc_lookup_common.[nfsv4].nfs4_proc_lookup.[nfsv4].nfs_lookup.lookup_slow.walk_component.path_lookupat
      3561 ± 11%     +12.9%       4020 ±  6%  sched_debug.cpu.curr->pid.avg
      9783 ±  6%     +11.8%      10942 ±  3%  sched_debug.cpu.curr->pid.max
      4222 ±  7%     +11.3%       4701 ±  3%  sched_debug.cpu.curr->pid.stddev
   3988122 ± 13%     +24.4%    4962088 ±  4%  sched_debug.cpu.max_idle_balance_cost.max
   1330791 ± 13%     +30.8%    1740923 ±  4%  sched_debug.cpu.max_idle_balance_cost.stddev
    576379 ±  1%      +9.7%     632485 ±  3%  sched_debug.cpu.nr_load_updates.max
    987546 ±  1%     +20.0%    1184637 ±  1%  sched_debug.cpu.nr_switches.avg
   1074939 ±  2%     +23.9%    1332366 ±  3%  sched_debug.cpu.nr_switches.max
     67934 ± 31%    +110.9%     143278 ±  5%  sched_debug.cpu.nr_switches.stddev
    -15.31 ±-32%     -41.6%      -8.93 ±-57%  sched_debug.cpu.nr_uninterruptible.min
    990916 ±  1%     +20.2%    1190867 ±  1%  sched_debug.cpu.sched_count.avg
   1079929 ±  2%     +24.2%    1341786 ±  3%  sched_debug.cpu.sched_count.max
     69632 ± 31%    +111.3%     147114 ±  5%  sched_debug.cpu.sched_count.stddev
    386683 ±  1%     +25.2%     483992 ±  2%  sched_debug.cpu.sched_goidle.avg
    424674 ±  1%     +29.4%     549482 ±  1%  sched_debug.cpu.sched_goidle.max
     33344 ± 23%    +107.5%      69183 ±  9%  sched_debug.cpu.sched_goidle.stddev
    513012 ±  1%     +19.1%     610887 ±  1%  sched_debug.cpu.ttwu_count.avg
    570351 ±  5%     +24.2%     708599 ±  5%  sched_debug.cpu.ttwu_count.max
     40059 ± 42%    +112.3%      85064 ± 14%  sched_debug.cpu.ttwu_count.stddev




Thanks,
Xiaolong

View attachment "config-4.8.0-rc6-01240-g3613b3d" of type "text/plain" (153047 bytes)

View attachment "job-script" of type "text/plain" (6322 bytes)

View attachment "job.yaml" of type "text/plain" (3920 bytes)

View attachment "reproduce" of type "text/plain" (28 bytes)

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