From owner-freebsd-hackers  Thu Sep  2 13:17:31 1999
Delivered-To: freebsd-hackers@freebsd.org
Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12])
	by hub.freebsd.org (Postfix) with ESMTP
	id 2B3C815B89; Thu,  2 Sep 1999 13:17:21 -0700 (PDT)
	(envelope-from wilko@yedi.iaf.nl)
Received: from yedi.iaf.nl (uucp@localhost)
	  by uni4nn.gn.iaf.nl (8.9.2/8.9.2) with UUCP id WAA03199;
	  Thu, 2 Sep 1999 22:02:26 +0200 (MET DST)
Received: (from wilko@localhost)
	by yedi.iaf.nl (8.9.3/8.9.3) id VAA06448;
	Thu, 2 Sep 1999 21:15:53 +0200 (CEST)
	(envelope-from wilko)
From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199909021915.VAA06448@yedi.iaf.nl>
Subject: Re: CFD: "bogomips" CPU performance metric
In-Reply-To: <37CEB68D.848BDAF8@sftw.com> from Nick Sayer at "Sep 2, 1999 10:40:30 am"
To: nsayer@FreeBSD.ORG
Date: Thu, 2 Sep 1999 21:15:53 +0200 (CEST)
Cc: freebsd-hackers@FreeBSD.ORG
X-Organisation: Private FreeBSD site - Arnhem, The Netherlands
X-pgp-info: PGP public key at 'finger wilko@freefall.freebsd.org'
X-Mailer: ELM [version 2.4ME+ PL43 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

As Nick Sayer wrote ...

> so long as
> they don't break anything in the process.
> 
> I would like to generate a number that will hopefully be reasonably
> compatible with
> the one Linux spits out. The best method I have come up with is to have
> a similar
> (the same?) count down loop in assembler. Have it count down from
> 1,000,000 and
> see how much nanotime() has gone by. NANSPERSEC/nansused = bogomips.
> A 1 bogomips machine will take an extra second to do this (anything
> likely to be
> even able to run FreeBSD should exceed 1 BM - yes, ha ha), and a kBM CPU
> 
> can do it in 1 ms. Perhaps in the future a prescaler might be required,
> but
> this whole thing is just really chrome anyway.
> 
> Would anyone scream and projectile-vomit if I added this to identcpu.c?

I really don't see any merit in adding Linux-isms like this. Sounds a bit
like the 'hack of the day' to me. I feel FreeBSD is well respected 
for it's stability etc. Not for it's 'me too' Linux-isms without any 
practical use. Mind you, I don't say Linux does not have stuff that is
useful for inclusion in FreeBSD. I just stay BogoMips is what it
calls itself: bogus, and should be kept from the FreeBSD kernel.

Just my Dfl 0.02

W/
-- 
|   / o / /  _  	 Arnhem, The Netherlands	- Powered by FreeBSD -
|/|/ / / /( (_) Bulte 	 WWW  : http://www.tcja.nl 	http://www.freebsd.org


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message