linux-kernel - Re: [PATCH] init: calibrate: don't print out bogomips value on boot

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Message-ID: <20131011104014.GC14732@mudshark.cambridge.arm.com>
Date:	Fri, 11 Oct 2013 11:40:14 +0100
From:	Will Deacon <will.deacon@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] init: calibrate: don't print out bogomips value on boot

On Thu, Oct 10, 2013 at 10:52:35PM +0100, Andrew Morton wrote:
> On Wed,  9 Oct 2013 15:57:20 +0100 Will Deacon <will.deacon@....com> wrote:
> 
> > @@ -295,9 +295,7 @@ void calibrate_delay(void)
> >  	}
> >  	per_cpu(cpu_loops_per_jiffy, this_cpu) = lpj;
> >  	if (!printed)
> > -		pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
> > -			lpj/(500000/HZ),
> > -			(lpj/(5000/HZ)) % 100, lpj);
> > +		pr_cont("lpj=%lu\n", lpj);
> >  
> >  	loops_per_jiffy = lpj;
> >  	printed = true;
> 
> Kidding?  BogoMIPS is an industry-standard metric which was established
> before many of us were born.  It even has its own wikipedia page!

Crikey, have you looked at that page? ARM is ominously described as `not
enough data (yet)' when discussing its BogoMIPS `rating'. This is all more
food for the marketing machines :(

> You have no heart.

Maybe I should stop worrying and learn to love the BogoMIPS.

Will
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