linux-kernel - Re: [lkp-robot] [x86/mm] c4c3c3c2d0: will-it-scale.per_process

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Message-ID: <20171018081109.mj6lzzihxmlle3b6@pd.tnic>
Date:   Wed, 18 Oct 2017 10:11:09 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Ye Xiaolong <xiaolong.ye@...el.com>
Cc:     Markus Trippelsdorf <markus@...ppelsdorf.de>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Adam Borowski <kilobyte@...band.pl>,
        Brian Gerst <brgerst@...il.com>,
        Johannes Hirte <johannes.hirte@...enkhaos.de>, LKP <lkp@...org>
Subject: Re: [lkp-robot] [x86/mm] c4c3c3c2d0: will-it-scale.per_process_ops
 -61.0% regression

On Wed, Oct 18, 2017 at 09:59:02AM +0800, Ye Xiaolong wrote:
> 2017-10-14 23:43:02 ./runtest.py context_switch1 295 process 44
> tasks,processes,processes_idle,threads,threads_idle,linear
> 0,0,100,0,100,0
> 44,7723745,22.45,0,0.00,0
> 
> per_process_ops = 7723745 / 44 = 175540

What is that 7723745 value? 44 too?

Please explain it in plain english and not in the context of some script
you're running. Just assume I don't know *anything* about will-it-scale.
How would you explain what those numbers are, to me?

And then consider adding boilerplate text to your reports *explaining*
what you're measuring because as it is now, people are left wondering
WTF is going on.

> percent -61% is computed by (174892 - 448554) / 448554

Ok, that I understand.

Thx.

-- 
Regards/Gruss,
    Boris.

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