linux-kernel - RE: [LKP] Re: [perf x86] b77491648e: will-it-scale.per_process

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Date:   Thu, 6 Feb 2020 03:07:15 +0000
From:   "Li, Philip" <philip.li@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>,
        "Chen, Rong A" <rong.a.chen@...el.com>
CC:     Roman Sudarikov <roman.sudarikov@...ux.intel.com>,
        lkp <lkp@...el.com>, Kan Liang <kan.liang@...ux.intel.com>,
        "Antonov, Alexander" <alexander.antonov@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>
Subject: RE: [LKP] Re: [perf x86] b77491648e: will-it-scale.per_process_ops
 -2.1% regression

> Subject: [LKP] Re: [perf x86] b77491648e: will-it-scale.per_process_ops -2.1%
> regression
> 
> kernel test robot <rong.a.chen@...el.com> writes:
> 
> > Greeting,
> >
> > FYI, we noticed a -2.1% regression of will-it-scale.per_process_ops due to
> commit:
> >
> >
> > commit: b77491648e6eb2f26b6edf5eaea859adc17f4dcc ("perf x86: Infrastructure
> for exposing an Uncore unit to PMON mapping")
> > https://github.com/0day-ci/linux/commits/roman-sudarikov-linux-intel-com/perf-
> x86-Exposing-IO-stack-to-IO-PMON-mapping-through-sysfs/20200118-075508
> 
> Seems to be spurious bisect. I don't think that commit could change
> anything performance related.
Hi Andi, we will look into this as early as possible, we also receive another input from
Pater Z that he got false positive of will-it-scale.per_process_ops performance
regression. We will investigate them.

> 
> -Andi
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