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Date: Sat, 22 Mar 2014 19:59:47 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Alex Shi <alex.shi@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [sched] 373e9ec30ad: -9.8% qperf.tcp_bw.bw.MB_sec
Alex,
FYI, we noticed the below changes on
https://github.com/alexshi/power-scheduling.git single-balance
commit 373e9ec30ad1efee2c4ba6b58fc317626e6482d0 ("sched: only do load balance on tick_do_timer_cpu")
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
0.10 ~ 3% +2134.7% 2.32 ~ 3% lkp-st02/micro/ebizzy/200%-100-10
0.10 ~ 3% +2134.7% 2.32 ~ 3% TOTAL ebizzy.throughput.per_thread.stddev_percent
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2432 ~50% -56.3% 1064 ~ 0% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
2432 ~50% -56.3% 1064 ~ 0% TOTAL fileio.request_latency_max_ms
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1541 ~ 0% +90.4% 2936 ~ 0% lkp-st02/micro/ebizzy/200%-100-10
1541 ~ 0% +90.4% 2936 ~ 0% TOTAL ebizzy.throughput.per_thread.max
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
135 ~ 4% +76.4% 238 ~33% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
135 ~ 4% +76.4% 238 ~33% TOTAL fileio.requests_per_sec
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1443 ~ 0% -31.2% 993 ~ 1% lkp-st02/micro/ebizzy/200%-100-10
1443 ~ 0% -31.2% 993 ~ 1% TOTAL ebizzy.throughput.per_thread.min
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
273 ~ 0% -11.2% 242 ~ 1% lkp-a06/micro/qperf/600s
273 ~ 0% -11.2% 242 ~ 1% TOTAL qperf.udp_bw.send_bw.MB_sec
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
268 ~ 0% -9.8% 242 ~ 0% lkp-a06/micro/qperf/600s
268 ~ 0% -9.8% 242 ~ 0% TOTAL qperf.tcp_bw.bw.MB_sec
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
266 ~ 0% -9.8% 240 ~ 1% lkp-a06/micro/qperf/600s
266 ~ 0% -9.8% 240 ~ 1% TOTAL qperf.udp_bw.recv_bw.MB_sec
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
18752 ~ 4% -19.1% 15167 ~11% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
48281 ~ 2% -81.3% 9035 ~ 1% lkp-a06/micro/qperf/600s
139171 ~ 8% -96.6% 4794 ~ 8% lkp-nex05/micro/will-it-scale/sched_yield
35512 ~ 1% -82.0% 6404 ~ 2% lkp-st02/micro/ebizzy/200%-100-10
241717 ~ 5% -85.4% 35402 ~ 6% TOTAL softirqs.SCHED
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1359067 ~ 4% -30.7% 942510 ~ 2% lkp-a06/micro/qperf/600s
63196 ~ 0% -84.2% 9974 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
1422264 ~ 3% -33.0% 952484 ~ 2% TOTAL interrupts.RES
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1013906 ~ 4% +76.3% 1787578 ~33% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
1013906 ~ 4% +76.3% 1787578 ~33% TOTAL proc-vmstat.pgpgin
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
71377 ~ 3% +74.3% 124397 ~32% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
71377 ~ 3% +74.3% 124397 ~32% TOTAL proc-vmstat.pgactivate
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2.076e+08 ~ 2% -33.4% 1.383e+08 ~ 9% lkp-a06/micro/qperf/600s
2.076e+08 ~ 2% -33.4% 1.383e+08 ~ 9% TOTAL cpuidle.C1.time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
69494 ~ 3% +69.9% 118079 ~31% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
69494 ~ 3% +69.9% 118079 ~31% TOTAL interrupts.43:PCI-MSI-edge.virtio1-requests
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
10201776 ~14% -30.1% 7133067 ~10% lkp-a06/micro/qperf/600s
10201776 ~14% -30.1% 7133067 ~10% TOTAL cpuidle.C3.time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
128295 ~ 0% -27.7% 92701 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
128295 ~ 0% -27.7% 92701 ~ 0% TOTAL cpuidle.C3-NHM.usage
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
52277488 ~ 4% -26.6% 38366608 ~ 6% lkp-a06/micro/qperf/600s
52277488 ~ 4% -26.6% 38366608 ~ 6% TOTAL cpuidle.C2.time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
49609 ~ 2% +38.8% 68871 ~19% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
49609 ~ 2% +38.8% 68871 ~19% TOTAL proc-vmstat.nr_active_file
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
198429 ~ 2% +38.8% 275466 ~19% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
198429 ~ 2% +38.8% 275466 ~19% TOTAL meminfo.Active(file)
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
3955 ~ 7% -24.8% 2972 ~14% lkp-a06/micro/qperf/600s
3955 ~ 7% -24.8% 2972 ~14% TOTAL cpuidle.C3.usage
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1.55 ~ 1% +27.6% 1.98 ~ 2% lkp-nex05/micro/will-it-scale/sched_yield
1.55 ~ 1% +27.6% 1.98 ~ 2% TOTAL perf-profile.cpu-cycles.trace_hardirqs_off_thunk.__sched_yield
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
220670 ~ 2% +34.9% 297725 ~17% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
220670 ~ 2% +34.9% 297725 ~17% TOTAL meminfo.Active
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
20.03 ~ 0% +25.8% 25.20 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
20.03 ~ 0% +25.8% 25.20 ~ 0% TOTAL turbostat.%c1
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2.16 ~ 1% +19.9% 2.58 ~ 2% lkp-nex05/micro/will-it-scale/sched_yield
2.16 ~ 1% +19.9% 2.58 ~ 2% TOTAL perf-profile.cpu-cycles.native_read_tsc.native_sched_clock.sched_clock.sched_clock_cpu.update_rq_clock
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
23914 ~ 4% -14.9% 20344 ~ 4% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
26884 ~ 4% -13.4% 23292 ~ 4% lkp-st02/micro/ebizzy/200%-100-10
50798 ~ 4% -14.1% 43636 ~ 4% TOTAL interrupts.IWI
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
7955 ~ 6% -14.7% 6789 ~ 3% lkp-st02/micro/ebizzy/200%-100-10
7955 ~ 6% -14.7% 6789 ~ 3% TOTAL slabinfo.kmalloc-64.active_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
3409 ~ 6% -14.0% 2932 ~ 3% lkp-st02/micro/ebizzy/200%-100-10
3409 ~ 6% -14.0% 2932 ~ 3% TOTAL slabinfo.kmalloc-192.active_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1.18 ~ 1% +15.5% 1.36 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
1.18 ~ 1% +15.5% 1.36 ~ 1% TOTAL perf-profile.cpu-cycles.rb_erase.__dequeue_entity.pick_next_task_fair.__schedule.schedule
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1.18 ~ 2% +16.6% 1.37 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
1.18 ~ 2% +16.6% 1.37 ~ 1% TOTAL perf-profile.cpu-cycles.rb_erase.pick_next_task_fair.__schedule.schedule.sys_sched_yield
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2743 ~ 4% -13.4% 2375 ~ 2% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
2743 ~ 4% -13.4% 2375 ~ 2% TOTAL uptime.idle
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
954 ~ 1% -15.0% 811 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
954 ~ 1% -15.0% 811 ~ 1% TOTAL slabinfo.taskstats.num_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
954 ~ 1% -15.0% 811 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
954 ~ 1% -15.0% 811 ~ 1% TOTAL slabinfo.taskstats.active_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1.81 ~ 2% -11.7% 1.60 ~ 1% lkp-nex05/micro/will-it-scale/sched_yield
1.81 ~ 2% -11.7% 1.60 ~ 1% TOTAL perf-profile.cpu-cycles.__dequeue_entity.pick_next_task_fair.__schedule.schedule.sys_sched_yield
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
25646 ~ 1% +13.7% 29148 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
25646 ~ 1% +13.7% 29148 ~ 0% TOTAL interrupts.0:IO-APIC-edge.timer
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2294497 ~ 0% -11.1% 2040824 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
2294497 ~ 0% -11.1% 2040824 ~ 0% TOTAL interrupts.LOC
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2972 ~ 0% +15.2% 3423 ~ 8% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
2972 ~ 0% +15.2% 3423 ~ 8% TOTAL slabinfo.radix_tree_node.num_slabs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2972 ~ 0% +15.2% 3423 ~ 8% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
2972 ~ 0% +15.2% 3423 ~ 8% TOTAL slabinfo.radix_tree_node.active_slabs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
83186 ~ 0% +15.2% 95811 ~ 8% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
83186 ~ 0% +15.2% 95811 ~ 8% TOTAL slabinfo.radix_tree_node.active_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
83245 ~ 0% +15.2% 95861 ~ 8% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
83245 ~ 0% +15.2% 95861 ~ 8% TOTAL slabinfo.radix_tree_node.num_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1245903 ~ 0% -10.2% 1118862 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
1245903 ~ 0% -10.2% 1118862 ~ 0% TOTAL softirqs.TIMER
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
6.34 ~ 1% -10.5% 5.67 ~ 2% lkp-nex05/micro/will-it-scale/sched_yield
6.34 ~ 1% -10.5% 5.67 ~ 2% TOTAL perf-profile.cpu-cycles.put_prev_task_fair.__schedule.schedule.sys_sched_yield.system_call_fastpath
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
3621 ~ 3% -9.6% 3275 ~ 2% lkp-st02/micro/ebizzy/200%-100-10
3621 ~ 3% -9.6% 3275 ~ 2% TOTAL slabinfo.kmalloc-192.num_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
9066611 ~ 0% -8.3% 8313872 ~ 1% lkp-a06/micro/qperf/600s
9066611 ~ 0% -8.3% 8313872 ~ 1% TOTAL proc-vmstat.pgalloc_dma32
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
8137 ~ 4% -7.9% 7495 ~ 2% lkp-st02/micro/ebizzy/200%-100-10
8137 ~ 4% -7.9% 7495 ~ 2% TOTAL slabinfo.kmalloc-64.num_objs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
24350865 ~ 0% -8.3% 22328921 ~ 1% lkp-a06/micro/qperf/600s
24350865 ~ 0% -8.3% 22328921 ~ 1% TOTAL proc-vmstat.pgfree
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
15285179 ~ 0% -8.3% 14016032 ~ 1% lkp-a06/micro/qperf/600s
15285179 ~ 0% -8.3% 14016032 ~ 1% TOTAL proc-vmstat.pgalloc_normal
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
91110 ~23% +8.6e+05% 7.845e+08 ~ 2% lkp-nex05/micro/will-it-scale/sched_yield
91110 ~23% +8.6e+05% 7.845e+08 ~ 2% TOTAL time.involuntary_context_switches
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
14152 ~ 1% +2.2% 14464 ~ 0% lkp-a06/micro/qperf/600s
14152 ~ 1% +2.2% 14464 ~ 0% TOTAL vmstat.system.cs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
968 ~ 4% +91.9% 1858 ~34% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
968 ~ 4% +91.9% 1858 ~34% TOTAL vmstat.io.bi
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2027778 ~ 4% +76.3% 3575122 ~33% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
2027778 ~ 4% +76.3% 3575122 ~33% TOTAL time.file_system_inputs
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2961 ~ 3% -19.7% 2378 ~ 3% lkp-a06/micro/qperf/600s
8365 ~ 0% -11.3% 7416 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
11326 ~ 1% -13.5% 9795 ~ 1% TOTAL vmstat.system.in
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
589 ~ 0% -15.6% 497 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
589 ~ 0% -15.6% 497 ~ 0% TOTAL time.user_time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
904 ~ 0% -13.6% 781 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
904 ~ 0% -13.6% 781 ~ 0% TOTAL time.percent_of_cpu_this_job_got
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
2244 ~ 0% -13.0% 1951 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
2244 ~ 0% -13.0% 1951 ~ 0% TOTAL time.system_time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
44.92 ~ 0% -11.5% 39.74 ~ 0% lkp-nex05/micro/will-it-scale/sched_yield
44.92 ~ 0% -11.5% 39.74 ~ 0% TOTAL turbostat.%c0
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
63860 ~ 2% +8.7% 69402 ~ 1% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
63860 ~ 2% +8.7% 69402 ~ 1% TOTAL vmstat.io.bo
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
1047 ~ 2% -8.0% 963 ~ 1% kbuildx/sysbench/fileio/600s-100%-1HDD-xfs-64G-1024-rndrd-sync
1047 ~ 2% -8.0% 963 ~ 1% TOTAL time.elapsed_time
v3.14-rc6 373e9ec30ad1efee2c4ba6b58
--------------- -------------------------
3887389 ~20% +9.7% 4262549 ~ 0% lkp-a06/micro/qperf/600s
3887389 ~20% +9.7% 4262549 ~ 0% TOTAL time.voluntary_context_switches
Legend:
~XX% - stddev percent
[+-]XX% - change percent
qperf.udp_bw.send_bw.MB_sec
280 ++-------------------------------------------------------------------+
| .*..... |
275 *+...*.....*.... ...*....*.... .. * |
270 ++ *....*.. *. |
| |
265 ++ |
260 ++ |
| |
255 ++ |
250 ++ O |
| |
245 ++ O |
240 O+ O O O O O O O
| O O O |
235 ++----------------------------------------O--------------------------+
[*] bisect-good sample
[O] bisect-bad sample
Thanks,
Fengguang
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