linux-kernel - Re: [x86/mce] 7bb39313cd: netperf.Throughput

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Date:   Tue, 19 Jan 2021 20:15:05 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        kernel test robot <oliver.sang@...el.com>,
        Jonathan Lemon <bsd@...com>, Tony Luck <tony.luck@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        lkp@...ts.01.org, lkp@...el.com, ying.huang@...el.com,
        zhengjun.xing@...el.com
Subject: Re: [x86/mce]  7bb39313cd:  netperf.Throughput_tps -4.5% regression

On Tue, Jan 19, 2021 at 11:02:55AM +0100, Borislav Petkov wrote:
> On Mon, Jan 18, 2021 at 08:27:21PM -0800, Paul E. McKenney wrote:
> > I bet that the results vary depending on the type of CPU, and also on
> > the kernel address-space layout, which of course also varies based on
> > the Kconfig options.  Let's see how the maintainers would like to proceed.
> 
> So I ran the "reproduce" script in the original mail on a KBL box here
> with the .config tailored for it:
> 
> cpu family      : 6
> model           : 158
> model name      : Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz
> stepping        : 12
> microcode       : 0xd6

I will also try to find a similar KBL in 0day to run the job. This
-4.5% comes from a CascadeLake AP which is 4 nodes, 96C/192T.

> and I get mixed results. But I'd need to know how exactly they generate
> the metrics "netperf.Throughput_total_tps" and "netperf.Throughput_tps"
> 
> Feng?

I have to admit I'm just a dumb user of 0day :) I'll leave this question
to Philip/Oliver/Rong who are from 0day team.

I assumed you've cloned the lkp-tests.git, and seems one Ruby file
https://github.com/intel/lkp-tests/blob/master/stats/netperf is used to
process the output of the netperf.

Thanks,
Feng

> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette