* [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw
@ 2014-06-03 10:08 Jet Chen
2014-06-03 14:17 ` Paul E. McKenney
0 siblings, 1 reply; 4+ messages in thread
From: Jet Chen @ 2014-06-03 10:08 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: LKML, lkp, Fengguang Wu
[-- Attachment #1: Type: text/plain, Size: 6346 bytes --]
Hi Paul,
FYI, we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/fixes
commit 5057f55e543b7859cfd26bc281291795eac93f8a ("rcu: Bind RCU grace-period kthreads if NO_HZ_FULL")
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.127e+09 ~ 0% -23.5% 1.628e+09 ~ 4% bens/qperf/600s
2.127e+09 ~ 0% -23.5% 1.628e+09 ~ 4% TOTAL qperf.udp.recv_bw
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.128e+09 ~ 0% -23.3% 1.633e+09 ~ 4% bens/qperf/600s
2.128e+09 ~ 0% -23.3% 1.633e+09 ~ 4% TOTAL qperf.udp.send_bw
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% bens/iperf/300s-tcp
2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% TOTAL iperf.tcp.sender.bps
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% bens/iperf/300s-tcp
2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% TOTAL iperf.tcp.receiver.bps
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
1.331e+09 ~ 2% -5.8% 1.255e+09 ~ 2% bens/qperf/600s
2.4e+09 ~ 6% -30.4% 1.671e+09 ~12% brickland3/qperf/600s
2.384e+09 ~ 7% -12.1% 2.096e+09 ~ 3% lkp-sb03/qperf/600s
6.115e+09 ~ 5% -17.9% 5.022e+09 ~ 6% TOTAL qperf.sctp.bw
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.83e+09 ~ 1% -12.5% 2.476e+09 ~ 3% bens/qperf/600s
2.83e+09 ~ 1% -12.5% 2.476e+09 ~ 3% TOTAL qperf.tcp.bw
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
2.272e+08 ~ 1% -13.3% 1.97e+08 ~ 2% bens/qperf/600s
2.272e+08 ~ 1% -13.3% 1.97e+08 ~ 2% TOTAL proc-vmstat.pgalloc_dma32
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
53062 ~ 2% -35.1% 34464 ~ 3% bens/qperf/600s
109531 ~13% +46.9% 160928 ~ 5% brickland3/qperf/600s
67902 ~ 1% +13.8% 77302 ~ 3% lkp-sb03/qperf/600s
230496 ~ 7% +18.3% 272694 ~ 4% TOTAL softirqs.RCU
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
80344 ~ 1% -26.2% 59325 ~ 2% bens/qperf/600s
80344 ~ 1% -26.2% 59325 ~ 2% TOTAL softirqs.SCHED
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
1036 ~ 4% -17.6% 853 ~ 4% brickland3/qperf/600s
1036 ~ 4% -17.6% 853 ~ 4% TOTAL proc-vmstat.nr_page_table_pages
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
48.12 ~ 0% -11.7% 42.46 ~ 6% brickland3/qperf/600s
48.12 ~ 0% -11.7% 42.46 ~ 6% TOTAL turbostat.%pc2
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
74689352 ~ 1% -13.3% 64771743 ~ 2% bens/qperf/600s
74689352 ~ 1% -13.3% 64771743 ~ 2% TOTAL proc-vmstat.pgalloc_normal
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
3.019e+08 ~ 1% -13.3% 2.618e+08 ~ 2% bens/qperf/600s
3.019e+08 ~ 1% -13.3% 2.618e+08 ~ 2% TOTAL proc-vmstat.pgfree
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
23538414 ~ 0% -12.9% 20506157 ~ 2% bens/qperf/600s
23538414 ~ 0% -12.9% 20506157 ~ 2% TOTAL proc-vmstat.numa_local
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
23538414 ~ 0% -12.9% 20506157 ~ 2% bens/qperf/600s
23538414 ~ 0% -12.9% 20506157 ~ 2% TOTAL proc-vmstat.numa_hit
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
12789 ~ 1% -10.9% 11391 ~ 2% bens/qperf/600s
12789 ~ 1% -10.9% 11391 ~ 2% TOTAL softirqs.HRTIMER
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
481253 ~ 0% -8.9% 438624 ~ 0% bens/qperf/600s
481253 ~ 0% -8.9% 438624 ~ 0% TOTAL softirqs.TIMER
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
1297 ~33% +565.9% 8640 ~ 7% bens/iperf/300s-tcp
2788 ~ 3% +588.8% 19204 ~ 4% bens/qperf/600s
1191 ~ 5% +1200.9% 15493 ~ 4% brickland3/qperf/600s
1135 ~26% +1195.9% 14709 ~ 4% lkp-sb03/qperf/600s
6411 ~13% +805.3% 58047 ~ 4% TOTAL time.involuntary_context_switches
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
72398 ~ 1% -5.4% 68503 ~ 0% bens/qperf/600s
8789 ~ 4% +22.3% 10749 ~15% lkp-sb03/qperf/600s
81187 ~ 1% -2.4% 79253 ~ 2% TOTAL vmstat.system.in
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
141174 ~ 1% -5.4% 133551 ~ 0% bens/qperf/600s
143982 ~ 1% -4.4% 137600 ~ 0% brickland3/qperf/600s
285156 ~ 1% -4.9% 271152 ~ 0% TOTAL vmstat.system.cs
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
42351859 ~ 0% -5.3% 40114932 ~ 0% bens/qperf/600s
43015383 ~ 1% -4.4% 41143092 ~ 0% brickland3/qperf/600s
85367242 ~ 1% -4.8% 81258025 ~ 0% TOTAL time.voluntary_context_switches
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
146 ~ 0% -2.2% 143 ~ 0% bens/qperf/600s
147 ~ 1% -4.8% 140 ~ 1% brickland3/qperf/600s
293 ~ 0% -3.5% 283 ~ 0% TOTAL time.percent_of_cpu_this_job_got
71a9b26963f8c2d 5057f55e543b7859cfd26bc28
--------------- -------------------------
872 ~ 0% -2.3% 853 ~ 0% bens/qperf/600s
874 ~ 1% -4.6% 834 ~ 1% brickland3/qperf/600s
1747 ~ 0% -3.4% 1687 ~ 0% TOTAL time.system_time
Legend:
~XX% - stddev percent
[+-]XX% - change percent
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.
Thanks,
Jet
[-- Attachment #2: reproduce --]
[-- Type: text/plain, Size: 324 bytes --]
echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
./runtest.py unlink1 32 1 2 3 4
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw
2014-06-03 10:08 [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw Jet Chen
@ 2014-06-03 14:17 ` Paul E. McKenney
2014-06-04 12:33 ` Fengguang Wu
0 siblings, 1 reply; 4+ messages in thread
From: Paul E. McKenney @ 2014-06-03 14:17 UTC (permalink / raw)
To: Jet Chen; +Cc: LKML, lkp, Fengguang Wu
On Tue, Jun 03, 2014 at 06:08:41PM +0800, Jet Chen wrote:
> Hi Paul,
>
> FYI, we noticed the below changes on
>
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/fixes
> commit 5057f55e543b7859cfd26bc281291795eac93f8a ("rcu: Bind RCU grace-period kthreads if NO_HZ_FULL")
My guess would be that some of these workloads generated enough callbacks
that binding all the rcuo callback-offloading kthreads to CPU 0 resulted
in a bottleneck. If that was the case, CPU 0 would often hit 100%
CPU utilization, and there would be more wait time on other CPUs because
callback execution was delayed.
Does that match what you are seeing?
Thanx, Paul
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.127e+09 ~ 0% -23.5% 1.628e+09 ~ 4% bens/qperf/600s
> 2.127e+09 ~ 0% -23.5% 1.628e+09 ~ 4% TOTAL qperf.udp.recv_bw
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.128e+09 ~ 0% -23.3% 1.633e+09 ~ 4% bens/qperf/600s
> 2.128e+09 ~ 0% -23.3% 1.633e+09 ~ 4% TOTAL qperf.udp.send_bw
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% bens/iperf/300s-tcp
> 2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% TOTAL iperf.tcp.sender.bps
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% bens/iperf/300s-tcp
> 2.101e+10 ~ 2% -18.7% 1.707e+10 ~ 2% TOTAL iperf.tcp.receiver.bps
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 1.331e+09 ~ 2% -5.8% 1.255e+09 ~ 2% bens/qperf/600s
> 2.4e+09 ~ 6% -30.4% 1.671e+09 ~12% brickland3/qperf/600s
> 2.384e+09 ~ 7% -12.1% 2.096e+09 ~ 3% lkp-sb03/qperf/600s
> 6.115e+09 ~ 5% -17.9% 5.022e+09 ~ 6% TOTAL qperf.sctp.bw
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.83e+09 ~ 1% -12.5% 2.476e+09 ~ 3% bens/qperf/600s
> 2.83e+09 ~ 1% -12.5% 2.476e+09 ~ 3% TOTAL qperf.tcp.bw
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 2.272e+08 ~ 1% -13.3% 1.97e+08 ~ 2% bens/qperf/600s
> 2.272e+08 ~ 1% -13.3% 1.97e+08 ~ 2% TOTAL proc-vmstat.pgalloc_dma32
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 53062 ~ 2% -35.1% 34464 ~ 3% bens/qperf/600s
> 109531 ~13% +46.9% 160928 ~ 5% brickland3/qperf/600s
> 67902 ~ 1% +13.8% 77302 ~ 3% lkp-sb03/qperf/600s
> 230496 ~ 7% +18.3% 272694 ~ 4% TOTAL softirqs.RCU
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 80344 ~ 1% -26.2% 59325 ~ 2% bens/qperf/600s
> 80344 ~ 1% -26.2% 59325 ~ 2% TOTAL softirqs.SCHED
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 1036 ~ 4% -17.6% 853 ~ 4% brickland3/qperf/600s
> 1036 ~ 4% -17.6% 853 ~ 4% TOTAL proc-vmstat.nr_page_table_pages
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 48.12 ~ 0% -11.7% 42.46 ~ 6% brickland3/qperf/600s
> 48.12 ~ 0% -11.7% 42.46 ~ 6% TOTAL turbostat.%pc2
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 74689352 ~ 1% -13.3% 64771743 ~ 2% bens/qperf/600s
> 74689352 ~ 1% -13.3% 64771743 ~ 2% TOTAL proc-vmstat.pgalloc_normal
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 3.019e+08 ~ 1% -13.3% 2.618e+08 ~ 2% bens/qperf/600s
> 3.019e+08 ~ 1% -13.3% 2.618e+08 ~ 2% TOTAL proc-vmstat.pgfree
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 23538414 ~ 0% -12.9% 20506157 ~ 2% bens/qperf/600s
> 23538414 ~ 0% -12.9% 20506157 ~ 2% TOTAL proc-vmstat.numa_local
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 23538414 ~ 0% -12.9% 20506157 ~ 2% bens/qperf/600s
> 23538414 ~ 0% -12.9% 20506157 ~ 2% TOTAL proc-vmstat.numa_hit
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 12789 ~ 1% -10.9% 11391 ~ 2% bens/qperf/600s
> 12789 ~ 1% -10.9% 11391 ~ 2% TOTAL softirqs.HRTIMER
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 481253 ~ 0% -8.9% 438624 ~ 0% bens/qperf/600s
> 481253 ~ 0% -8.9% 438624 ~ 0% TOTAL softirqs.TIMER
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 1297 ~33% +565.9% 8640 ~ 7% bens/iperf/300s-tcp
> 2788 ~ 3% +588.8% 19204 ~ 4% bens/qperf/600s
> 1191 ~ 5% +1200.9% 15493 ~ 4% brickland3/qperf/600s
> 1135 ~26% +1195.9% 14709 ~ 4% lkp-sb03/qperf/600s
> 6411 ~13% +805.3% 58047 ~ 4% TOTAL time.involuntary_context_switches
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 72398 ~ 1% -5.4% 68503 ~ 0% bens/qperf/600s
> 8789 ~ 4% +22.3% 10749 ~15% lkp-sb03/qperf/600s
> 81187 ~ 1% -2.4% 79253 ~ 2% TOTAL vmstat.system.in
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 141174 ~ 1% -5.4% 133551 ~ 0% bens/qperf/600s
> 143982 ~ 1% -4.4% 137600 ~ 0% brickland3/qperf/600s
> 285156 ~ 1% -4.9% 271152 ~ 0% TOTAL vmstat.system.cs
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 42351859 ~ 0% -5.3% 40114932 ~ 0% bens/qperf/600s
> 43015383 ~ 1% -4.4% 41143092 ~ 0% brickland3/qperf/600s
> 85367242 ~ 1% -4.8% 81258025 ~ 0% TOTAL time.voluntary_context_switches
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 146 ~ 0% -2.2% 143 ~ 0% bens/qperf/600s
> 147 ~ 1% -4.8% 140 ~ 1% brickland3/qperf/600s
> 293 ~ 0% -3.5% 283 ~ 0% TOTAL time.percent_of_cpu_this_job_got
>
> 71a9b26963f8c2d 5057f55e543b7859cfd26bc28
> --------------- -------------------------
> 872 ~ 0% -2.3% 853 ~ 0% bens/qperf/600s
> 874 ~ 1% -4.6% 834 ~ 1% brickland3/qperf/600s
> 1747 ~ 0% -3.4% 1687 ~ 0% TOTAL time.system_time
>
>
> Legend:
> ~XX% - stddev percent
> [+-]XX% - change percent
>
>
>
>
> 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.
>
> Thanks,
> Jet
>
>
> echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
> echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
> echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
> ./runtest.py unlink1 32 1 2 3 4
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw
2014-06-03 14:17 ` Paul E. McKenney
@ 2014-06-04 12:33 ` Fengguang Wu
2014-06-04 22:17 ` Paul E. McKenney
0 siblings, 1 reply; 4+ messages in thread
From: Fengguang Wu @ 2014-06-04 12:33 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: Jet Chen, LKML, lkp
Hi Paul,
On Tue, Jun 03, 2014 at 07:17:20AM -0700, Paul E. McKenney wrote:
> On Tue, Jun 03, 2014 at 06:08:41PM +0800, Jet Chen wrote:
> > Hi Paul,
> >
> > FYI, we noticed the below changes on
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/fixes
> > commit 5057f55e543b7859cfd26bc281291795eac93f8a ("rcu: Bind RCU grace-period kthreads if NO_HZ_FULL")
>
> My guess would be that some of these workloads generated enough callbacks
> that binding all the rcuo callback-offloading kthreads to CPU 0 resulted
> in a bottleneck. If that was the case, CPU 0 would often hit 100%
> CPU utilization, and there would be more wait time on other CPUs because
> callback execution was delayed.
>
> Does that match what you are seeing?
This is the /proc/stat contents on completion of test
brickland3/qperf/600s. It shows that CPU 0 is not busy.
cpu 1707 0 57716 8569826 33 0 14572 0 0 0
cpu0 2 0 575 69345 29 0 8 0 0 0
cpu1 0 0 86 72203 3 0 1 0 0 0
cpu2 116 0 386 71437 0 0 0 0 0 0
The columns of numbers are:
- user: normal processes executing in user mode
- nice: niced processes executing in user mode
- system: processes executing in kernel mode
- idle: twiddling thumbs
- iowait: waiting for I/O to complete
- irq: servicing interrupts
- softirq: servicing softirqs
- steal: involuntary wait
- guest: running a normal guest
- guest_nice: running a niced guest
cpu3 32 0 59 72213 0 0 0 0 0 0
cpu4 8 0 35 72272 0 0 0 0 0 0
cpu5 1 0 3 72318 0 0 0 0 0 0
cpu6 1 0 3 72320 0 0 0 0 0 0
cpu7 0 0 2 72327 0 0 0 0 0 0
cpu8 0 0 2 72323 0 0 0 0 0 0
cpu9 0 0 1 72323 0 0 0 0 0 0
cpu10 0 0 2 72314 0 0 0 0 0 0
cpu11 0 0 2 72317 0 0 0 0 0 0
cpu12 0 0 3 72311 0 0 0 0 0 0
cpu13 0 0 2 72313 0 0 0 0 0 0
cpu14 0 0 20 72296 0 0 0 0 0 0
cpu15 0 0 90 72192 0 0 1 0 0 0
cpu16 0 0 13 72288 0 0 1 0 0 0
cpu17 115 0 137 71848 0 0 0 0 0 0
cpu18 28 0 32 72106 0 0 0 0 0 0
cpu19 7 0 5 72256 0 0 0 0 0 0
cpu20 2 0 72 71938 0 0 0 0 0 0
cpu21 0 0 3 72273 0 0 0 0 0 0
cpu22 0 0 2 72284 0 0 0 0 0 0
cpu23 0 0 1 72284 0 0 0 0 0 0
cpu24 0 0 2 72279 0 0 0 0 0 0
cpu25 0 0 1 72281 0 0 0 0 0 0
cpu26 0 0 2 72274 0 0 0 0 0 0
cpu27 0 0 5 72274 0 0 0 0 0 0
cpu28 0 0 22 72255 0 0 0 0 0 0
cpu29 0 0 1 72273 0 0 0 0 0 0
cpu30 24 0 748 70165 0 0 407 0 0 0
cpu31 28 0 906 70251 0 0 465 0 0 0
cpu32 62 0 2276 68376 0 0 604 0 0 0
cpu33 27 0 1100 70059 0 0 453 0 0 0
cpu34 23 0 1359 69933 0 0 418 0 0 0
cpu35 32 0 1663 69109 0 0 775 0 0 0
cpu36 103 0 8569 60806 0 0 2306 0 0 0
cpu37 88 0 7052 63141 0 0 518 0 0 0
cpu38 51 0 2881 67927 0 0 498 0 0 0
cpu39 36 0 1705 69166 0 0 430 0 0 0
cpu40 99 0 8657 60720 0 0 1767 0 0 0
cpu41 103 0 7088 61185 0 0 1749 0 0 0
cpu42 42 0 1567 69244 0 0 525 0 0 0
cpu43 43 0 1661 68865 0 0 457 0 0 0
cpu44 39 0 2610 68046 0 0 660 0 0 0
cpu45 3 0 248 71852 0 0 30 0 0 0
cpu46 4 0 16 72140 0 0 6 0 0 0
cpu47 115 0 297 71435 0 0 159 0 0 0
cpu48 30 0 81 71940 0 0 61 0 0 0
cpu49 14 0 163 71815 0 0 118 0 0 0
cpu50 6 0 144 71832 0 0 129 0 0 0
cpu51 12 0 508 71217 0 0 276 0 0 0
cpu52 18 0 498 71082 0 0 378 0 0 0
cpu53 11 0 440 71236 0 0 282 0 0 0
cpu54 4 0 205 71710 0 0 144 0 0 0
cpu55 4 0 136 71898 0 0 78 0 0 0
cpu56 13 0 400 71305 0 0 288 0 0 0
cpu57 14 0 377 71346 0 0 316 0 0 0
cpu58 2 0 109 71954 0 0 73 0 0 0
cpu59 1 0 8 72174 0 0 3 0 0 0
cpu60 0 0 0 72191 0 0 0 0 0 0
cpu61 86 0 313 71749 0 0 0 0 0 0
cpu62 3 0 9 72173 0 0 0 0 0 0
cpu63 2 0 8 72175 0 0 0 0 0 0
cpu64 0 0 2 72178 0 0 0 0 0 0
cpu65 0 0 2 72177 0 0 0 0 0 0
cpu66 0 0 2 72175 0 0 0 0 0 0
cpu67 0 0 2 72173 0 0 0 0 0 0
cpu68 0 0 4 72169 0 0 0 0 0 0
cpu69 0 0 2 72168 0 0 0 0 0 0
cpu70 0 0 1 72166 0 0 0 0 0 0
cpu71 0 0 1 72164 0 0 0 0 0 0
cpu72 0 0 0 72163 0 0 0 0 0 0
cpu73 0 0 0 72161 0 0 0 0 0 0
cpu74 0 0 1 72158 0 0 0 0 0 0
cpu75 0 0 0 72156 0 0 0 0 0 0
cpu76 73 0 330 71709 0 0 0 0 0 0
cpu77 4 0 10 72137 0 0 0 0 0 0
cpu78 1 0 4 72145 0 0 0 0 0 0
cpu79 0 0 50 72077 0 0 0 0 0 0
cpu80 0 0 5 72138 0 0 0 0 0 0
cpu81 0 0 1 72141 0 0 0 0 0 0
cpu82 0 0 66 72074 0 0 0 0 0 0
cpu83 0 0 1 72137 0 0 0 0 0 0
cpu84 0 0 0 72136 0 0 0 0 0 0
cpu85 0 0 1 72133 0 0 0 0 0 0
cpu86 0 0 0 72131 0 0 0 0 0 0
cpu87 0 0 0 72129 0 0 0 0 0 0
cpu88 0 0 1 72127 0 0 0 0 0 0
cpu89 0 0 0 72124 0 0 0 0 0 0
cpu90 0 0 0 72122 0 0 0 0 0 0
cpu91 63 0 1377 70501 0 0 162 0 0 0
cpu92 2 0 14 72100 0 0 0 0 0 0
cpu93 1 0 5 72109 0 0 0 0 0 0
cpu94 0 0 4 72108 0 0 0 0 0 0
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cpu97 0 0 0 72105 0 0 0 0 0 0
cpu98 0 0 1 72102 0 0 0 0 0 0
cpu99 0 0 2 72099 0 0 0 0 0 0
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cpu101 0 0 0 72096 0 0 0 0 0 0
cpu102 0 0 0 72094 0 0 0 0 0 0
cpu103 0 0 1 72092 0 0 0 0 0 0
cpu104 0 0 0 72089 0 0 0 0 0 0
cpu105 0 0 1 72086 0 0 0 0 0 0
cpu106 66 0 363 71601 0 0 9 0 0 0
cpu107 2 0 4 72075 0 0 0 0 0 0
cpu108 0 0 2 72077 0 0 0 0 0 0
cpu109 0 0 8 72069 0 0 0 0 0 0
cpu110 0 0 1 72073 0 0 0 0 0 0
cpu111 0 0 9 72063 0 0 0 0 0 0
cpu112 0 0 1 72070 0 0 0 0 0 0
cpu113 0 0 0 72068 0 0 0 0 0 0
cpu114 0 0 1 72064 0 0 0 0 0 0
cpu115 0 0 1 72063 0 0 0 0 0 0
cpu116 0 0 1 72060 0 0 0 0 0 0
cpu117 0 0 0 72059 0 0 0 0 0 0
cpu118 0 0 0 72056 0 0 0 0 0 0
cpu119 0 0 1 72053 0 0 0 0 0 0
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ctxt 84441175
btime 1401871947
processes 23608
procs_running 2
procs_blocked 0
softirq 84702758 9 1574595 174 82369760 28 0 305 456968 84738 216181
Thanks,
Fengguang
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw
2014-06-04 12:33 ` Fengguang Wu
@ 2014-06-04 22:17 ` Paul E. McKenney
0 siblings, 0 replies; 4+ messages in thread
From: Paul E. McKenney @ 2014-06-04 22:17 UTC (permalink / raw)
To: Fengguang Wu; +Cc: Jet Chen, LKML, lkp
On Wed, Jun 04, 2014 at 08:33:38PM +0800, Fengguang Wu wrote:
> Hi Paul,
>
> On Tue, Jun 03, 2014 at 07:17:20AM -0700, Paul E. McKenney wrote:
> > On Tue, Jun 03, 2014 at 06:08:41PM +0800, Jet Chen wrote:
> > > Hi Paul,
> > >
> > > FYI, we noticed the below changes on
> > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/fixes
> > > commit 5057f55e543b7859cfd26bc281291795eac93f8a ("rcu: Bind RCU grace-period kthreads if NO_HZ_FULL")
> >
> > My guess would be that some of these workloads generated enough callbacks
> > that binding all the rcuo callback-offloading kthreads to CPU 0 resulted
> > in a bottleneck. If that was the case, CPU 0 would often hit 100%
> > CPU utilization, and there would be more wait time on other CPUs because
> > callback execution was delayed.
> >
> > Does that match what you are seeing?
>
> This is the /proc/stat contents on completion of test
> brickland3/qperf/600s. It shows that CPU 0 is not busy.
Hmmm... Might be sometimes busy, thus blocking grace periods?
I posted a speculative fix at a558e309f99cf8b809691417324c6770e10bb614,
please let me know how it goes!
Thanx, Paul
> cpu 1707 0 57716 8569826 33 0 14572 0 0 0
> cpu0 2 0 575 69345 29 0 8 0 0 0
> cpu1 0 0 86 72203 3 0 1 0 0 0
> cpu2 116 0 386 71437 0 0 0 0 0 0
>
> The columns of numbers are:
>
> - user: normal processes executing in user mode
> - nice: niced processes executing in user mode
> - system: processes executing in kernel mode
> - idle: twiddling thumbs
> - iowait: waiting for I/O to complete
> - irq: servicing interrupts
> - softirq: servicing softirqs
> - steal: involuntary wait
> - guest: running a normal guest
> - guest_nice: running a niced guest
>
> cpu3 32 0 59 72213 0 0 0 0 0 0
> cpu4 8 0 35 72272 0 0 0 0 0 0
> cpu5 1 0 3 72318 0 0 0 0 0 0
> cpu6 1 0 3 72320 0 0 0 0 0 0
> cpu7 0 0 2 72327 0 0 0 0 0 0
> cpu8 0 0 2 72323 0 0 0 0 0 0
> cpu9 0 0 1 72323 0 0 0 0 0 0
> cpu10 0 0 2 72314 0 0 0 0 0 0
> cpu11 0 0 2 72317 0 0 0 0 0 0
> cpu12 0 0 3 72311 0 0 0 0 0 0
> cpu13 0 0 2 72313 0 0 0 0 0 0
> cpu14 0 0 20 72296 0 0 0 0 0 0
> cpu15 0 0 90 72192 0 0 1 0 0 0
> cpu16 0 0 13 72288 0 0 1 0 0 0
> cpu17 115 0 137 71848 0 0 0 0 0 0
> cpu18 28 0 32 72106 0 0 0 0 0 0
> cpu19 7 0 5 72256 0 0 0 0 0 0
> cpu20 2 0 72 71938 0 0 0 0 0 0
> cpu21 0 0 3 72273 0 0 0 0 0 0
> cpu22 0 0 2 72284 0 0 0 0 0 0
> cpu23 0 0 1 72284 0 0 0 0 0 0
> cpu24 0 0 2 72279 0 0 0 0 0 0
> cpu25 0 0 1 72281 0 0 0 0 0 0
> cpu26 0 0 2 72274 0 0 0 0 0 0
> cpu27 0 0 5 72274 0 0 0 0 0 0
> cpu28 0 0 22 72255 0 0 0 0 0 0
> cpu29 0 0 1 72273 0 0 0 0 0 0
> cpu30 24 0 748 70165 0 0 407 0 0 0
> cpu31 28 0 906 70251 0 0 465 0 0 0
> cpu32 62 0 2276 68376 0 0 604 0 0 0
> cpu33 27 0 1100 70059 0 0 453 0 0 0
> cpu34 23 0 1359 69933 0 0 418 0 0 0
> cpu35 32 0 1663 69109 0 0 775 0 0 0
> cpu36 103 0 8569 60806 0 0 2306 0 0 0
> cpu37 88 0 7052 63141 0 0 518 0 0 0
> cpu38 51 0 2881 67927 0 0 498 0 0 0
> cpu39 36 0 1705 69166 0 0 430 0 0 0
> cpu40 99 0 8657 60720 0 0 1767 0 0 0
> cpu41 103 0 7088 61185 0 0 1749 0 0 0
> cpu42 42 0 1567 69244 0 0 525 0 0 0
> cpu43 43 0 1661 68865 0 0 457 0 0 0
> cpu44 39 0 2610 68046 0 0 660 0 0 0
> cpu45 3 0 248 71852 0 0 30 0 0 0
> cpu46 4 0 16 72140 0 0 6 0 0 0
> cpu47 115 0 297 71435 0 0 159 0 0 0
> cpu48 30 0 81 71940 0 0 61 0 0 0
> cpu49 14 0 163 71815 0 0 118 0 0 0
> cpu50 6 0 144 71832 0 0 129 0 0 0
> cpu51 12 0 508 71217 0 0 276 0 0 0
> cpu52 18 0 498 71082 0 0 378 0 0 0
> cpu53 11 0 440 71236 0 0 282 0 0 0
> cpu54 4 0 205 71710 0 0 144 0 0 0
> cpu55 4 0 136 71898 0 0 78 0 0 0
> cpu56 13 0 400 71305 0 0 288 0 0 0
> cpu57 14 0 377 71346 0 0 316 0 0 0
> cpu58 2 0 109 71954 0 0 73 0 0 0
> cpu59 1 0 8 72174 0 0 3 0 0 0
> cpu60 0 0 0 72191 0 0 0 0 0 0
> cpu61 86 0 313 71749 0 0 0 0 0 0
> cpu62 3 0 9 72173 0 0 0 0 0 0
> cpu63 2 0 8 72175 0 0 0 0 0 0
> cpu64 0 0 2 72178 0 0 0 0 0 0
> cpu65 0 0 2 72177 0 0 0 0 0 0
> cpu66 0 0 2 72175 0 0 0 0 0 0
> cpu67 0 0 2 72173 0 0 0 0 0 0
> cpu68 0 0 4 72169 0 0 0 0 0 0
> cpu69 0 0 2 72168 0 0 0 0 0 0
> cpu70 0 0 1 72166 0 0 0 0 0 0
> cpu71 0 0 1 72164 0 0 0 0 0 0
> cpu72 0 0 0 72163 0 0 0 0 0 0
> cpu73 0 0 0 72161 0 0 0 0 0 0
> cpu74 0 0 1 72158 0 0 0 0 0 0
> cpu75 0 0 0 72156 0 0 0 0 0 0
> cpu76 73 0 330 71709 0 0 0 0 0 0
> cpu77 4 0 10 72137 0 0 0 0 0 0
> cpu78 1 0 4 72145 0 0 0 0 0 0
> cpu79 0 0 50 72077 0 0 0 0 0 0
> cpu80 0 0 5 72138 0 0 0 0 0 0
> cpu81 0 0 1 72141 0 0 0 0 0 0
> cpu82 0 0 66 72074 0 0 0 0 0 0
> cpu83 0 0 1 72137 0 0 0 0 0 0
> cpu84 0 0 0 72136 0 0 0 0 0 0
> cpu85 0 0 1 72133 0 0 0 0 0 0
> cpu86 0 0 0 72131 0 0 0 0 0 0
> cpu87 0 0 0 72129 0 0 0 0 0 0
> cpu88 0 0 1 72127 0 0 0 0 0 0
> cpu89 0 0 0 72124 0 0 0 0 0 0
> cpu90 0 0 0 72122 0 0 0 0 0 0
> cpu91 63 0 1377 70501 0 0 162 0 0 0
> cpu92 2 0 14 72100 0 0 0 0 0 0
> cpu93 1 0 5 72109 0 0 0 0 0 0
> cpu94 0 0 4 72108 0 0 0 0 0 0
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> cpu96 0 0 1 72106 0 0 0 0 0 0
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> cpu98 0 0 1 72102 0 0 0 0 0 0
> cpu99 0 0 2 72099 0 0 0 0 0 0
> cpu100 0 0 1 72099 0 0 0 0 0 0
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> cpu106 66 0 363 71601 0 0 9 0 0 0
> cpu107 2 0 4 72075 0 0 0 0 0 0
> cpu108 0 0 2 72077 0 0 0 0 0 0
> cpu109 0 0 8 72069 0 0 0 0 0 0
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> cpu111 0 0 9 72063 0 0 0 0 0 0
> cpu112 0 0 1 72070 0 0 0 0 0 0
> cpu113 0 0 0 72068 0 0 0 0 0 0
> cpu114 0 0 1 72064 0 0 0 0 0 0
> cpu115 0 0 1 72063 0 0 0 0 0 0
> cpu116 0 0 1 72060 0 0 0 0 0 0
> cpu117 0 0 0 72059 0 0 0 0 0 0
> cpu118 0 0 0 72056 0 0 0 0 0 0
> cpu119 0 0 1 72053 0 0 0 0 0 0
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> ctxt 84441175
> btime 1401871947
> processes 23608
> procs_running 2
> procs_blocked 0
> softirq 84702758 9 1574595 174 82369760 28 0 305 456968 84738 216181
>
> Thanks,
> Fengguang
>
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2014-06-03 10:08 [rcu] 5057f55e543: -23.5% qperf.udp.recv_bw Jet Chen
2014-06-03 14:17 ` Paul E. McKenney
2014-06-04 12:33 ` Fengguang Wu
2014-06-04 22:17 ` Paul E. McKenney
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