linux-kernel - Re: [genirq] cbe16f35be: will-it-scale.per_thread

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Message-ID: <87fszcnecr.ffs@nanos.tec.linutronix.de>
Date:   Tue, 27 Apr 2021 13:42:12 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kernel test robot <oliver.sang@...el.com>,
        Barry Song <song.bao.hua@...ilicon.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com, ying.huang@...el.com, feng.tang@...el.com,
        zhengjun.xing@...el.com, x86@...nel.org
Subject: Re: [genirq]  cbe16f35be:  will-it-scale.per_thread_ops -5.2% regression

Folks,

On Tue, Apr 27 2021 at 17:00, kernel test robot wrote:

> Greeting,
>
> FYI, we noticed a -5.2% regression of will-it-scale.per_thread_ops due to commit:
>
> commit: cbe16f35bee6880becca6f20d2ebf6b457148552 ("genirq: Add IRQF_NO_AUTOEN for request_irq/nmi()")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

this is the second report in the last week which makes not a lot of sense.
And this oneis makes absolutely no sense at all.

This commit affects request_irq() and the related variants and has
exactly ZERO influence on anything related to that test case simply
because.

I seriously have to ask the question whether this test infrastructure is
actually measuring what it claims to measure.

As this commit clearly _cannot_ have the 'measured' side effect, this
points to some serious issue in the tests or the test infrastructure
itself.

Thanks,

        tglx