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Date: Sun, 29 Jun 2014 15:47:00 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Fengguang Wu <fengguang.wu@...el.com>
Cc: Dave Hansen <dave.hansen@...el.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [rcu] 2d033d5c0d4: +225.2% iperf.tcp.sender.bps
On Sun, Jun 29, 2014 at 11:15:44PM +0800, Fengguang Wu wrote:
> Hi Paul,
>
> FYI, we noticed the below changes on
>
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
> commit 2d033d5c0d424b7029abd0fc82e940ebc318fd89 ("rcu: Bind grace-period kthreads to non-NO_HZ_FULL CPUs")
Nice! Clearly outlines the hazards of providing too few housekeeping CPUs,
I would guess.
Thanx, Paul
> test case: bens/iperf/300s-tcp
>
> e17adc3f20bc9a1 2d033d5c0d424b7029abd0fc8
> --------------- -------------------------
> 7.011e+09 ~ 1% +225.2% 2.28e+10 ~ 2% TOTAL iperf.tcp.sender.bps
> 7.011e+09 ~ 1% +225.2% 2.28e+10 ~ 2% TOTAL iperf.tcp.receiver.bps
> 15620691 ~ 1% +224.3% 50663012 ~ 2% TOTAL proc-vmstat.pgalloc_normal
> 62969722 ~ 1% +224.3% 2.042e+08 ~ 2% TOTAL proc-vmstat.pgfree
> 47347349 ~ 1% +224.3% 1.535e+08 ~ 2% TOTAL proc-vmstat.pgalloc_dma32
> 4996590 ~ 1% +218.9% 15933563 ~ 3% TOTAL softirqs.NET_RX
> 8084072 ~ 1% +218.4% 25739055 ~ 2% TOTAL proc-vmstat.numa_hit
> 8084072 ~ 1% +218.4% 25739055 ~ 2% TOTAL proc-vmstat.numa_local
> 28676 ~ 2% -47.5% 15059 ~11% TOTAL softirqs.RCU
> 99756 ~ 2% +76.0% 175606 ~ 2% TOTAL softirqs.SCHED
> 562 ~11% +50.9% 848 ~17% TOTAL slabinfo.proc_inode_cache.active_objs
> 620 ~ 8% +38.7% 860 ~15% TOTAL slabinfo.proc_inode_cache.num_objs
> 271905 ~ 4% +17.4% 319216 ~ 0% TOTAL softirqs.TIMER
> 1117 ~ 1% -9.1% 1015 ~ 2% TOTAL proc-vmstat.pgactivate
> 9049 ~11% -94.6% 485 ~26% TOTAL time.involuntary_context_switches
> 23233 ~ 1% +72.1% 39979 ~ 2% TOTAL vmstat.system.cs
> 13078 ~ 1% +69.1% 22117 ~ 1% TOTAL vmstat.system.in
>
> Legend:
> ~XX% - stddev percent
> [+-]XX% - change percent
>
>
> iperf.tcp.sender.bps
>
> 2.4e+10 ++----O-----O-----------O--------------O-----O--------O-----O-----+
> | O O O O O O O O |
> 2.2e+10 O+ O O O |
> 2e+10 ++ O |
> | |
> 1.8e+10 ++ |
> 1.6e+10 ++ O O |
> | |
> 1.4e+10 ++ |
> 1.2e+10 ++ |
> | |
> 1e+10 ++ |
> 8e+09 ++ |
> *..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*
> 6e+09 ++----------------------------------------------------------------+
>
>
> iperf.tcp.receiver.bps
>
> 2.4e+10 ++----O-----O-----------O--------------O-----O--------O-----O-----+
> | O O O O O O O O |
> 2.2e+10 O+ O O O |
> 2e+10 ++ O |
> | |
> 1.8e+10 ++ |
> 1.6e+10 ++ O O |
> | |
> 1.4e+10 ++ |
> 1.2e+10 ++ |
> | |
> 1e+10 ++ |
> 8e+09 ++ |
> *..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*..*
> 6e+09 ++----------------------------------------------------------------+
>
>
> time.involuntary_context_switches
>
> 14000 ++------------------------------------------------------------------+
> | |
> 12000 *+. .*.. ..*..*.. .*.. |
> | .*..*. *. *. |
> 10000 ++ *. *..*.. .*..*..*.. ..*..*.. *
> | *. *. .*.. ..|
> 8000 ++ *. * |
> | |
> 6000 ++ |
> | |
> 4000 ++ |
> | |
> 2000 ++ |
> | O O O O |
> 0 O+-O--O--O--O--O---O--O--O--O--O--O--O--O-----O------O--O-----O-----+
>
>
> [*] bisect-good sample
> [O] bisect-bad sample
>
>
> 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,
> Fengguang
> ./iperf3 -s
> ./iperf3 -t 300 -f M -J -c 127.0.0.1
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