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Date:   Tue, 12 Jan 2021 15:14:38 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        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,
        feng.tang@...el.com, zhengjun.xing@...el.com
Subject: Re: [x86/mce]  7bb39313cd:  netperf.Throughput_tps -4.5% regression

On Tue, Jan 12, 2021 at 10:21:09PM +0800, kernel test robot wrote:
> 
> Greeting,
> 
> FYI, we noticed a -4.5% regression of netperf.Throughput_tps due to commit:
> 
> 
> commit: 7bb39313cd6239e7eb95198950a02b4ad2a08316 ("x86/mce: Make mce_timed_out() identify holdout CPUs")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git ras/core
> 
> 
> in testcase: netperf
> on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G memory
> with following parameters:
> 
> 	ip: ipv4
> 	runtime: 300s
> 	nr_threads: 16
> 	cluster: cs-localhost
> 	test: TCP_CRR
> 	cpufreq_governor: performance
> 	ucode: 0x5003003
> 
> test-description: Netperf is a benchmark that can be use to measure various aspect of networking performance.
> test-url: http://www.netperf.org/netperf/

I'm very very sceptical this thing benchmarks #MC exception handler
performance. Because the code this patch adds gets run only during a MCE
exception.

So unless I'm missing something obvious please check your setup.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

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