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Message-ID: <53A27D66.6070409@hitachi.com>
Date: Thu, 19 Jun 2014 15:04:22 +0900
From: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
To: Jet Chen <jet.chen@...el.com>
Cc: Fengguang Wu <fengguang.wu@...el.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org,
Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [tracing] 939c7a4f04f: -46.4% cpuidle.C3-IVT.time
Hi Jet,
Thank you for your report.
I have some questions for your test.
1. Did you enable ftrace?
This patch added a feature for ftrace. If you disabled ftrace in
this test, my patch will not affect the system. Moreover, in my patch,
arrays for saved_cmdlines were just changed from using static global
variables to using kmalloc() on default setting. So, even if you enabled
ftrace, this patch will not induce a big problem, I think.
2. How did you test it and what does the result mean?
Please tell me the workload, how to calculate the score,
system settings, etc...
Thanks,
Yoshihiro YUNOMAE
(2014/06/18 12:15), Jet Chen wrote:
> Hi Yoshihiro,
>
> FYI, we noticed the below changes on
>
> commit 939c7a4f04fcd2162109744e8bf88194948a6e65 ("tracing: Introduce
> saved_cmdlines_size file")
>
> test case: brickland3/aim7/3000-brk_test
>
> beba4bb096201ce 939c7a4f04fcd2162109744e8
> --------------- -------------------------
> 352643 ~40% -46.4% 189136 ~15% TOTAL cpuidle.C3-IVT.time
> 750 ~ 2% -13.3% 650 ~ 2% TOTAL vmstat.procs.b
> 362016 ~ 3% -6.0% 340296 ~ 3% TOTAL
> proc-vmstat.pgmigrate_success
> 362016 ~ 3% -6.0% 340296 ~ 3% TOTAL
> proc-vmstat.numa_pages_migrated
> 1642328 ~ 3% +13.3% 1860721 ~ 2% TOTAL softirqs.RCU
> 2278829 ~ 2% -14.0% 1959647 ~ 2% TOTAL
> time.voluntary_context_switches
> 207 ~ 0% -10.4% 185 ~ 0% TOTAL time.user_time
> ~ 0% +8.5% ~ 0% TOTAL turbostat.RAM_W
> 4418246 ~ 3% -6.4% 4136447 ~ 1% TOTAL time.minor_page_faults
> ~ 0% +3.4% ~ 0% TOTAL turbostat.Cor_W
> ~ 0% +3.0% ~ 0% TOTAL turbostat.Pkg_W
> 11354889 ~ 0% +2.0% 11579897 ~ 0% TOTAL
> time.involuntary_context_switches
>
> Legend:
> ~XX% - stddev percent
> [+-]XX% - change percent
>
>
> time.voluntary_context_switches
>
> 2.4e+06
> ++---------------------------------------------------*------------+
> *.. *.. ..
> .. |
> 2.3e+06 ++ .*.. *.. ..
> * |
> | *..*. . .*.. .. * *.. +
> *.. *..*
> | *. * . .*..*.. +
> .. |
> 2.2e+06 ++ *..*. *
> * |
>
> | |
> 2.1e+06
> ++ |
>
> | |
> 2e+06 O+ O O
> O |
> | O O O
> O |
> | O O O O
> O |
> 1.9e+06 ++ O O O
> O |
> | O O
> O |
> 1.8e+06
> ++----------------------------------------------------------------+
>
>
> turbostat.Pkg_W
>
> ++--------------------------------------------------------------------+
> O+ O O O O O |
> | O O O O O O O O O O O O |
> ++ O O |
> ++ |
> ++ |
> ++ |
> | |
> ++ |
> ++ |
> ++ *.. .*.. |
> *+.*... .. *...*. *...*..*..*...*..*.. ..*.. *...*..*..*...*..*
> | * *. .. |
> ++ * |
> ++--------------------------------------------------------------------+
>
>
> turbostat.Cor_W
>
> ++--------------------------------------------------------------------+
> O+ O O O O O O O O O |
> | O O O O O O O O O O |
> ++ |
> ++ |
> | |
> ++ |
> ++ |
> ++ |
> | |
> ++ *.. |
> *+.*... .. *...*..*..*...*..*..*...*..*.. ..*.. *... .*..*...*..*
> | * *. .. *. |
> ++ * |
> ++--------------------------------------------------------------------+
>
>
> turbostat.RAM_W
>
> ++---------------------------------------------------------------------+
> | O O 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,
> Jet
>
>
--
Yoshihiro YUNOMAE
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: yoshihiro.yunomae.ez@...achi.com
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