linux-kernel - Re: [PATCH -next v1] x86/apic: Reduce print level of CPU limit announcement

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Date:   Wed, 27 Mar 2019 13:58:39 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Joe Perches <joe@...ches.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86 <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-pm <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v1] x86/apic: Reduce print level of CPU limit
 announcement

On Wed, Mar 27, 2019 at 12:49:17PM +0100, Borislav Petkov wrote:
> On Wed, Mar 27, 2019 at 01:36:28PM +0200, Leon Romanovsky wrote:
> > At the end, it is reduced to our usage, we are running QEMU inside
> > docker to test kernel changes with limitation on number of CPUs to use.
> > The systems are optimized to boot kernel as soon as possible in order
> > to run tests and on my machine (64 CPUs) reduce is visible: from ~2.6
> > sec to ~2.3 sec from execution to kernel boot.
>
> You're kidding, right?
>
> 0.3 sec boot time "improvement" for a kernel on which you run tests
> which take orders of magnitude longer (I assume). And you want to hide
> this message in the upstream kernel because you want to minimally speed
> up *your* *specific* usage ?
>
> And we still are wasting time talking about this?!

I understand your point, we will keep it internally.
Sorry for wasting your time.

Thanks

>
> Oh boy.
>
> --
> Regards/Gruss,
>     Boris.
>
> Good mailing practices for 400: avoid top-posting and trim the reply.

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