linux-kernel - Re: [RFC PATCH 0/2] ARM: Remove any correlation between IPC and BogoMips value

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Message-ID: <5191033E.2000303@codeaurora.org>
Date:	Mon, 13 May 2013 11:14:06 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Will Deacon <will.deacon@....com>
CC:	Marc Zyngier <Marc.Zyngier@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 0/2] ARM: Remove any correlation between IPC and BogoMips
 value

Hi Will,

On 05/08/2013 05:06 AM, Will Deacon wrote:
> Hello Christopher,
> 
> On Tue, May 07, 2013 at 04:48:26PM +0100, Christopher Covington wrote:
>> On 05/07/2013 05:08 AM, Will Deacon wrote:
>>> That seems like a lot of effort in order to preserve something that isn't
>>> even meaningful. We might be better just zeroing the value, but then we'll
>>> inevitably get bug reports of it being `wrong'.
>>
>> If I were in to filing bug reports about bogomips values, I would be just as
>> likely to do it for 1, 10000, 99999, and get_random_bytes(...) as for 0.
> 
> That's a fair point, and one of the reasons I posted this as an RFC. I'd
> basically like an `obviously bogus' value so that people don't think `hey,
> my CPU sure it slow' and instead think `looks like this really is a bogus
> value after all'.
> 
> However, you're probably right that there isn't a number which can convey
> that information properly, so how about we just put a string in there along
> the lines of "not reported" and leave it at that?

That sounds reasonable to me.

Christopher

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