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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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