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Date: Thu, 16 Jan 2014 09:23:01 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Alex Shi <alex.shi@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>, lkp@...ux.intel.com
Subject: Re: [sched] 73628fba4: +69% context switches
On Mon, Jan 13, 2014 at 01:57:30PM +0800, Alex Shi wrote:
> On 01/11/2014 06:19 PM, Fengguang Wu wrote:
> > Alex,
> >
> > FYI, we find much increased interrupts and context switches introduced
> > by commit 73628fba4 ("sched: unify imbalance bias for target group")
> > in your noload branch:
>
> Many thanks for the generous and quick testing! :)
>
> few questions for the results and give a testing patch for try. it also push on github.
>
> What's about the aim7 shell_rtns_1 and shared throughput?
The throughputs remain the same. We only report changed numbers.
> > 7bea8c18805a5f1 73628fba451ae72221b155696
> > --------------- -------------------------
> > 14979 ~ 4% +1304.8% 210434 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
> > 2748 ~ 5% +977.4% 29607 ~ 0% nhm-white/micro/aim7/shared
> > 17727 +1254.1% 240041 TOTAL interrupts.RES
>
> RES interrupt increased about 200,000, but vmstat's interrupt
> increased a little. guess the vmstat data is per seconds, right? If
Yes.
> so, it is better give how long time the vmstat running.
vmstat runs throughout the aim7 test run.
> The same problem on the time.involuntary_context_switches and vmstat cs.
ditto.
> According to involuntary CS definition in time, RES interrupt will cause involuntary CS. but here 29607 RES of aim7/shared cause 233218 time inv CS, does sth I missed or the data is incorrect?
>
> >
> > 7bea8c18805a5f1 73628fba451ae72221b155696
> > --------------- -------------------------
> > 3617 ~ 0% +69.2% 6118 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
> > 3617 +69.2% 6118 TOTAL vmstat.system.in
> >
> > 7bea8c18805a5f1 73628fba451ae72221b155696
> > --------------- -------------------------
> > 132746 ~ 0% +69.0% 224346 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
> > 220038 ~ 0% +6.0% 233218 ~ 0% nhm-white/micro/aim7/shared
> > 352785 +29.7% 457564 TOTAL time.involuntary_context_switches
> >
> > 7bea8c18805a5f1 73628fba451ae72221b155696
> > --------------- -------------------------
> > 1424581 ~ 0% +8.6% 1546786 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
> > 1424581 +8.6% 1546786 TOTAL time.voluntary_context_switches
> >
> > 7bea8c18805a5f1 73628fba451ae72221b155696
> > --------------- -------------------------
> > 20982 ~ 0% +12.5% 23599 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
> > 6005 ~ 0% +4.2% 6256 ~ 0% nhm-white/micro/aim7/shared
> > 26988 +10.6% 29856 TOTAL vmstat.system.cs
> >
> > vmstat.system.cs
> >
>
> commit c5a8778a132cfa882609fbccb4ee6542eac9866d
> Author: Alex Shi <alex.shi@...aro.org>
> Date: Mon Jan 13 13:54:30 2014 +0800
>
> more bias towards local cpu group
In your rebased tree, there are still much increased interrupts and
context switches:
Comparing 91dd08bd65052b483f96f75ab ("sched: more bias towards local
cpu group") with upstream:
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
48 ~13% +485.4% 281 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
48 +485.4% 281 TOTAL numa-vmstat.node1.nr_shmem
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
10142 ~ 4% +2737.8% 287830 ~ 2% lkp-ne04/micro/aim7/shell_rtns_1
1349 ~16% +1479.3% 21319 ~ 4% nhm-white/micro/aim7/dbase
11492 +2590.0% 309149 TOTAL interrupts.RES
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
194 ~12% +472.9% 1115 ~ 2% lkp-ne04/micro/aim7/shell_rtns_1
194 +472.9% 1115 TOTAL numa-meminfo.node1.Shmem
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
118634 ~ 2% -73.0% 32081 ~ 0% nhm-white/micro/aim7/dbase
118634 -73.0% 32081 TOTAL interrupts.IWI
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
327 ~ 1% -71.0% 95 ~ 4% lkp-ne04/micro/aim7/shell_rtns_1
327 -71.0% 95 TOTAL numa-vmstat.node0.nr_shmem
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
1312 ~ 1% -70.8% 383 ~ 4% lkp-ne04/micro/aim7/shell_rtns_1
1312 -70.8% 383 TOTAL numa-meminfo.node0.Shmem
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
11786 ~ 9% +141.4% 28451 ~ 3% lkp-ne04/micro/aim7/shell_rtns_1
11786 +141.4% 28451 TOTAL sched_debug.cfs_rq[10]:/.min_vruntime
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
30715 ~ 0% -50.4% 15249 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
30715 -50.4% 15249 TOTAL numa-meminfo.node0.KernelStack
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
3823 ~ 0% -50.1% 1908 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
3823 -50.1% 1908 TOTAL numa-vmstat.node0.nr_kernel_stack
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
22270 ~ 3% +91.0% 42527 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
22270 +91.0% 42527 TOTAL sched_debug.cfs_rq[10]:/.blocked_load_avg
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
1967 ~ 0% +90.5% 3749 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
1967 +90.5% 3749 TOTAL numa-vmstat.node1.nr_kernel_stack
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
15819 ~ 1% +89.1% 29910 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
15819 +89.1% 29910 TOTAL numa-meminfo.node1.KernelStack
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
41191 ~ 4% +75.7% 72359 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
41191 +75.7% 72359 TOTAL numa-meminfo.node1.SUnreclaim
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
10264 ~ 3% +76.5% 18121 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
10264 +76.5% 18121 TOTAL numa-vmstat.node1.nr_slab_unreclaimable
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
17782 ~ 2% -40.0% 10670 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
17782 -40.0% 10670 TOTAL numa-vmstat.node0.nr_slab_unreclaimable
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
71301 ~ 1% -40.0% 42766 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
71301 -40.0% 42766 TOTAL numa-meminfo.node0.SUnreclaim
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
59103 ~ 3% +49.8% 88528 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
59103 +49.8% 88528 TOTAL numa-meminfo.node1.Slab
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
89141 ~ 1% -30.2% 62248 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
89141 -30.2% 62248 TOTAL numa-meminfo.node0.Slab
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
38773 ~ 2% +29.7% 50304 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
38773 +29.7% 50304 TOTAL sched_debug.cpu#10.nr_switches
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
35293 ~ 1% +24.8% 44029 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
35293 +24.8% 44029 TOTAL sched_debug.cpu#15.nr_switches
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
35772 ~ 1% +23.9% 44317 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
35772 +23.9% 44317 TOTAL sched_debug.cpu#14.nr_switches
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
946595 ~ 0% -14.2% 812568 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
946595 -14.2% 812568 TOTAL numa-meminfo.node0.MemUsed
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
5966 ~ 0% +11.1% 6627 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
5966 +11.1% 6627 TOTAL slabinfo.mm_struct.active_objs
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
131624 ~ 0% +99.0% 261914 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
131624 +99.0% 261914 TOTAL time.involuntary_context_switches
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
3542 ~ 0% +104.2% 7233 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
2407 ~ 0% -10.4% 2156 ~ 0% nhm-white/micro/aim7/dbase
5950 +57.8% 9389 TOTAL vmstat.system.in
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
20993 ~ 0% +17.1% 24588 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
2166 ~ 0% +7.8% 2335 ~ 0% nhm-white/micro/aim7/dbase
23159 +16.3% 26923 TOTAL vmstat.system.cs
v3.13-rc8 91dd08bd65052b483f96f75ab
--------------- -------------------------
1423954 ~ 0% +12.2% 1598169 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
1423954 +12.2% 1598169 TOTAL time.voluntary_context_switches
Comparing e69bd3470ef8ab10bcb9d6ad4 ("sched: unify imbalance bias for
target group") with its parent:
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
15604 ~ 3% +1268.6% 213573 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
1532 ~16% +647.7% 11455 ~ 6% nhm-white/micro/aim7/dbase
17136 +1213.1% 225029 TOTAL interrupts.RES
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
107861 ~ 1% -63.0% 39865 ~ 2% nhm-white/micro/aim7/dbase
107861 -63.0% 39865 TOTAL interrupts.IWI
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
133536 ~ 0% +69.4% 226257 ~ 1% lkp-ne04/micro/aim7/shell_rtns_1
133536 +69.4% 226257 TOTAL time.involuntary_context_switches
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
2359 ~ 0% -9.5% 2134 ~ 0% nhm-white/micro/aim7/dbase
2359 -9.5% 2134 TOTAL vmstat.system.in
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
1431362 ~ 0% +8.5% 1552345 ~ 0% lkp-ne04/micro/aim7/shell_rtns_1
1431362 +8.5% 1552345 TOTAL time.voluntary_context_switches
64651525f152c05 e69bd3470ef8ab10bcb9d6ad4
--------------- -------------------------
2162 ~ 0% +5.2% 2274 ~ 0% nhm-white/micro/aim7/dbase
2162 +5.2% 2274 TOTAL vmstat.system.cs
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