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Message-ID: <20150210072634.GZ16879@pengutronix.de>
Date: Tue, 10 Feb 2015 08:26:34 +0100
From: Markus Pargmann <mpa@...gutronix.de>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [sched/core] 9edfbfed3f5: +88.2%
hackbench.time.involuntary_context_switches
Hi,
On Mon, Feb 09, 2015 at 09:31:20AM +0100, Peter Zijlstra wrote:
> On Mon, Feb 09, 2015 at 01:58:33PM +0800, Huang Ying wrote:
> > FYI, we noticed the below changes on
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
> > commit 9edfbfed3f544a7830d99b341f0c175995a02950 ("sched/core: Rework rq->clock update skips")
> >
> >
> > testbox/testcase/testparams: xps2/hackbench/performance-1600%-process-socket
> >
> > cebde6d681aa45f9 9edfbfed3f544a7830d99b341f
> > ---------------- --------------------------
> > %stddev %change %stddev
> > \ | \
> > 1839273 ± 6% +88.2% 3462337 ± 4% hackbench.time.involuntary_context_switches
> > 41965851 ± 5% +5.6% 44307403 ± 1% hackbench.time.voluntary_context_switches
> > 388 ± 39% -58.6% 160 ± 10% sched_debug.cfs_rq[1]:/.tg_load_contrib
> > 12957 ± 14% -60.5% 5117 ± 11% sched_debug.cfs_rq[2]:/.tg_load_avg
> > 30505 ± 14% -57.7% 12905 ± 6% sched_debug.cfs_rq[3]:/.tg_load_avg
> > 2790 ± 24% -65.4% 964 ± 32% sched_debug.cfs_rq[3]:/.blocked_load_avg
> > 2915 ± 23% -62.2% 1101 ± 29% sched_debug.cfs_rq[3]:/.tg_load_contrib
> > 1839273 ± 6% +88.2% 3462337 ± 4% time.involuntary_context_switches
> > 1474 ± 28% -61.7% 565 ± 43% sched_debug.cfs_rq[2]:/.tg_load_contrib
> > 11830 ± 15% +63.0% 19285 ± 11% sched_debug.cpu#4.sched_goidle
> > 19319 ± 29% +91.1% 36913 ± 7% sched_debug.cpu#3.sched_goidle
> > 5899 ± 31% -35.6% 3801 ± 11% sched_debug.cfs_rq[4]:/.blocked_load_avg
> > 5999 ± 30% -34.5% 3929 ± 11% sched_debug.cfs_rq[4]:/.tg_load_contrib
> > 37884 ± 13% -33.5% 25207 ± 7% sched_debug.cfs_rq[4]:/.tg_load_avg
> > 229547 ± 5% +47.9% 339519 ± 5% cpuidle.C1-NHM.usage
> > 35712 ± 3% +31.7% 47036 ± 9% cpuidle.C3-NHM.usage
> > 5010 ± 9% -29.0% 3556 ± 20% sched_debug.cfs_rq[6]:/.blocked_load_avg
> > 5139 ± 9% -28.2% 3690 ± 19% sched_debug.cfs_rq[6]:/.tg_load_contrib
> > 49568 ± 6% +24.8% 61867 ± 7% sched_debug.cpu#1.sched_goidle
> > 26369 ± 35% -42.0% 15289 ± 29% cpuidle.C6-NHM.usage
> > 18 ± 16% +36.5% 25 ± 7% sched_debug.cpu#4.nr_running
> > 1.41 ± 12% -19.3% 1.14 ± 13% perf-profile.cpu-cycles.sock_wfree.unix_destruct_scm.skb_release_head_state.skb_release_all.consume_skb
> > 25 ± 15% +28.7% 32 ± 9% sched_debug.cpu#3.nr_running
> > 1.63 ± 11% -18.0% 1.34 ± 12% perf-profile.cpu-cycles.unix_destruct_scm.skb_release_head_state.skb_release_all.consume_skb.unix_stream_recvmsg
> > 0.57 ± 8% +9.6% 0.62 ± 5% turbostat.CPU%c1
> > 148 ± 11% -16.7% 123 ± 7% sched_debug.cfs_rq[1]:/.load
> > 109 ± 6% +17.1% 128 ± 6% sched_debug.cpu#6.cpu_load[0]
> > 2.41 ± 8% -13.3% 2.09 ± 11% perf-profile.cpu-cycles.skb_release_head_state.skb_release_all.consume_skb.unix_stream_recvmsg.sock_aio_read
> > 147 ± 12% -16.4% 123 ± 7% sched_debug.cpu#1.load
> > 111 ± 5% +15.4% 129 ± 5% sched_debug.cpu#6.cpu_load[2]
> > 110 ± 5% +14.9% 127 ± 5% sched_debug.cfs_rq[6]:/.runnable_load_avg
> > 112 ± 5% +14.5% 128 ± 4% sched_debug.cpu#6.cpu_load[3]
> > 113 ± 5% +13.2% 128 ± 3% sched_debug.cpu#6.cpu_load[4]
> > 789953 ± 2% -10.8% 704528 ± 4% sched_debug.cpu#3.avg_idle
> > 15471 ± 5% -7.7% 14278 ± 2% sched_debug.cpu#5.curr->pid
> > 2675106 ± 10% +16.2% 3109411 ± 1% sched_debug.cpu#4.nr_switches
> > 2675140 ± 10% +16.2% 3109440 ± 1% sched_debug.cpu#4.sched_count
> > 155201 ± 5% +14.6% 177901 ± 3% softirqs.RCU
> > 8.64 ± 6% -9.6% 7.82 ± 5% perf-profile.cpu-cycles.skb_release_all.consume_skb.unix_stream_recvmsg.sock_aio_read.sock_aio_read
> > 2658351 ± 11% +13.7% 3021564 ± 2% sched_debug.cpu#5.sched_count
> > 2658326 ± 11% +13.7% 3021539 ± 2% sched_debug.cpu#5.nr_switches
> > 71443 ± 5% +9.9% 78486 ± 0% vmstat.system.cs
> > 8209 ± 5% +7.3% 8805 ± 0% vmstat.system.in
> >
>
> OK, so the interesting number is total runtime; I cannot find it.
> Therefore I cannot say what if anything changed. This is just a bunch of
> random numbers afaict.
The total runtime of hackbench in v3.19 compared to v3.15 to v3.18 is
shown here [1] (Group 5 -> linux_perf.hackbench). It is not the same
project so the profiling data is not related and not recorded. The
results should be reproducable by simply running hackbench with the same
options as cbenchsuite [2] did. The options are always listed in the
result browser [1] below the plots.
Best Regards,
Markus
[1] http://results.cbenchsuite.org/plots/2015-02-09__v3.15-v3.19-quad/detailed/
[2] http://cbenchsuite.org
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