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

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Date:   Tue, 17 Oct 2017 10:00:37 +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>,
        kernel test robot <xiaolong.ye@...el.com>,
        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 Tue, Oct 17, 2017 at 06:57:43AM +0200, Markus Trippelsdorf wrote:
> On 2017.10.16 at 18:06 -0700, Andy Lutomirski wrote:
> > On Mon, Oct 16, 2017 at 3:15 AM, Borislav Petkov <bp@...en8.de> wrote:
> > > On Mon, Oct 16, 2017 at 10:39:17AM +0800, kernel test robot wrote:
> > >>
> > >> Greeting,
> > >>
> > >> FYI, we noticed a -61.0% regression of will-it-scale.per_process_ops due to commit:
> 
> I think you are reading this wrong:
> -61.0% regression means 61.0% improvement.

Well, it has this:

5b8809deb4b0a77f  c4c3c3c2d00826c88b5c02c20e
----------------  --------------------------
         %stddev      change         %stddev
             \          |                \
    448554             -61%     174892        will-it-scale.per_process_ops

Xiaolong, can you first explain what those numbers mean? And how do you
compute those 61%?

Thx.

-- 
Regards/Gruss,
    Boris.

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