linux-kernel - Re: [x86] 339a3922f6: +4.3% aim7 jobs-per-min

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Date:	Thu, 20 Feb 2014 14:13:20 +0100
From:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: Re: [x86] 339a3922f6: +4.3% aim7 jobs-per-min

op 20-02-14 14:06, Fengguang Wu schreef:
> Hi Maarten,
>
> We are glad to find that your commit 339a3922f68dcb7d93001f07b7e914d5cf6c066d
> ("decrease useless padding") increased aim disk_src performance by 4.3%:
>
> 74833276be6802b  339a3922f68dcb7d93001f07b
> ---------------  -------------------------
>      511685 ~ 0%      +4.3%     533571 ~ 0%  TOTAL aim7.2000.jobs-per-min
>       77.30 ~ 0%      -9.9%      69.66 ~ 0%  TOTAL time.system_time
>        1.95 ~ 2%      +7.0%       2.09 ~ 2%  TOTAL iostat.sda.rrqm/s
>       23.57 ~ 0%      -4.1%      22.60 ~ 0%  TOTAL time.elapsed_time
>         425 ~ 0%      -3.1%        412 ~ 0%  TOTAL time.percent_of_cpu_this_job_got
>        7.59 ~ 0%      -2.9%       7.37 ~ 0%  TOTAL boottime.dhcp
>       15.24 ~ 0%      -1.9%      14.94 ~ 0%  TOTAL boottime.boot
>
Really? I just did it to get rid of the 15-byte nop sequences with tons of prefixes.
Interesting..

~Maarten

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