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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Anton Blanchard <anton@samba.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	balbir@linux.vnet.ibm.com,
	Bharata B Rao <bharata@linux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
	mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org,
	schwidefsky@de.ibm.com, balajirrao@gmail.com,
	dhaval@linux.vnet.ibm.com, tglx@linutronix.de,
	akpm@linux-foundation.org
Subject: Re: [PATCH] better align percpu counter (Was Re: [tip:sched/core] sched: cpuacct: Use bigger percpu counter batch values for stats counters
Date: Fri, 21 Aug 2009 11:20:54 +0900	[thread overview]
Message-ID: <20090821112054.1e6bc4e6.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20090820100403.GB29093@elte.hu>

On Thu, 20 Aug 2009 12:04:03 +0200
Ingo Molnar <mingo@elte.hu> wrote:
> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> > with your program
> > before patch.
> > cpuacct off : 414000-416000 ctsw per sec.
> > cpuacct on  : 401000-404000 ctsw per sec.
> > 
> > after patch
> > cpuacct on  : 412000-413000 ctsw per sec.
> > 
> > Maybe I should check cache-miss late ;)
> 
> Btw., in latest upstream you can do that via:
> 
>   cd tools/perf/
>   make -j install
> 
>   perf stat --repeat 5 -- taskset -c 1 ./context_switch
> 

tried. (on 8cpu/2socket host). It seems cache-miss decreases.
But IPC ..?
==
/root/bin/perf stat --repeat 5 -a -e cycles,instructions,cache-misses,L1-dcache-load-misses,L1-dcache-store-misses -- ./ctxt_sw.sh
[Before] patch
 Performance counter stats for './ctxt_sw.sh' (5 runs):

  1511260148530  cycles                     ( +-   0.025% )  (scaled from 63.49%             )
   470690642181  instructions             #      0.311 IPC     ( +-   0.098% )(scaled from 79.49%)
     1210051728  cache-misses               ( +-   0.629% )  (scaled from 79.00%             )
     3202978828  L1-dcache-load-misses      ( +-   1.118% )  (scaled from 78.00%             )
     1803963907  L1-dcache-store-misses     ( +-   0.728% )  (scaled from 42.99%             )

   60.161941918  seconds time elapsed   ( +-   0.029% )

[After] patch
 Performance counter stats for './ctxt_sw.sh' (5 runs):

  1511961867506  cycles                     ( +-   0.018% )  (scaled from 71.50%)
   448724406149  instructions             #      0.297 IPC     ( +-   0.133% )  (scaled from 75.49%)
     1184548041  cache-misses               ( +-   0.136% )  (scaled from 75.50%)
     3086357048  L1-dcache-load-misses      ( +-   0.822% )  (scaled from 77.50%)
     1708375493  L1-dcache-store-misses     ( +-   0.328% )  (scaled from 47.00%)

   60.179814774  seconds time elapsed   ( +-   0.052% )

Thanks,
-Kame


  reply	other threads:[~2009-08-21  2:23 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-07  9:59 [PATCH v3] cpuacct: VIRT_CPU_ACCOUNTING don't prevent percpu cputime count KOSAKI Motohiro
2009-05-07 10:50 ` Ingo Molnar
2009-05-09  9:26   ` KOSAKI Motohiro
2009-05-09  9:38     ` Peter Zijlstra
2009-05-09  9:52       ` KOSAKI Motohiro
2009-05-09 10:14         ` KOSAKI Motohiro
2009-05-11 12:33           ` [tip:sched/core] sched: cpuacct: Use bigger percpu counter batch values for stats counters tip-bot for KOSAKI Motohiro
2009-05-11 12:36           ` tip-bot for KOSAKI Motohiro
2009-05-11 15:07             ` Ingo Molnar
2009-05-12 10:01               ` KOSAKI Motohiro
2009-05-12 10:02                 ` Peter Zijlstra
2009-05-12 10:06                   ` KOSAKI Motohiro
2009-05-12 10:22                     ` KOSAKI Motohiro
2009-05-12 10:27                       ` Ingo Molnar
2009-05-12 10:42                         ` KOSAKI Motohiro
2009-05-12 10:10                 ` Balbir Singh
2009-05-12 10:13                   ` KOSAKI Motohiro
2009-05-12 10:24                     ` Balbir Singh
2009-05-12 10:29                       ` Ingo Molnar
2009-05-12 10:44                         ` KOSAKI Motohiro
2009-05-12 13:28                           ` Ingo Molnar
2009-05-12 13:40                             ` KOSAKI Motohiro
2009-05-12 13:42                               ` Ingo Molnar
2009-07-16  8:10                           ` Bharata B Rao
2009-07-16  8:39                             ` Anton Blanchard
2009-08-20  5:10                               ` Anton Blanchard
2009-08-20  5:16                                 ` KAMEZAWA Hiroyuki
2009-08-20  5:26                                 ` Balbir Singh
2009-08-20  5:52                                   ` Peter Zijlstra
2009-08-20  6:05                                     ` Anton Blanchard
2009-08-20  6:10                                       ` KAMEZAWA Hiroyuki
2009-08-20  6:24                                         ` Anton Blanchard
2009-08-20  8:41                                           ` [PATCH] better align percpu counter (Was " KAMEZAWA Hiroyuki
2009-08-20 10:04                                             ` Ingo Molnar
2009-08-21  2:20                                               ` KAMEZAWA Hiroyuki [this message]
2009-08-21 11:29                                                 ` Ingo Molnar
2009-08-21  3:56                                             ` KAMEZAWA Hiroyuki
2009-08-20 11:46                                           ` Balbir Singh
2009-08-21  6:21                                           ` KAMEZAWA Hiroyuki
2010-01-18  4:41                                 ` [PATCH] " Anton Blanchard
2010-01-18  4:55                                   ` KOSAKI Motohiro
2010-01-18  7:51                                   ` Peter Zijlstra
2010-01-18  8:21                                     ` Anton Blanchard
2010-01-18  8:34                                       ` Peter Zijlstra
2010-01-18  8:35                                   ` Balbir Singh
2010-01-18  9:42                                   ` Martin Schwidefsky
2010-01-18  9:55                                     ` Anton Blanchard
2010-01-18 11:00                                       ` Balbir Singh
2010-01-21 15:25                                       ` Balbir Singh
2010-01-21 15:36                                         ` Peter Zijlstra
2010-01-25 23:14                                   ` Andrew Morton
2010-01-25 23:44                                     ` KOSAKI Motohiro
2010-01-26  6:17                                     ` Balbir Singh
2010-01-26  6:35                                       ` Andrew Morton
2010-01-26  8:07                                         ` Anton Blanchard
2010-01-27 13:15                                   ` [tip:sched/urgent] " tip-bot for Anton Blanchard
2010-01-27 13:34                                     ` Balbir Singh
2010-01-27 21:22                                       ` Andrew Morton
2010-01-27 21:43                                         ` Peter Zijlstra
2010-01-28 12:48                                           ` [PATCH 1/2] percpu_counter: Make __percpu_counter_add an inline function on UP Anton Blanchard
2010-01-28 12:52                                             ` [PATCH 2/2] sched: cpuacct: Use bigger percpu counter batch values for stats counters Anton Blanchard
2010-01-28  5:21                                         ` [tip:sched/urgent] " Balbir Singh

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