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Date:      Fri, 31 Dec 1999 11:20:35 -0800
From:      "David Schwartz" <davids@webmaster.com>
To:        "Brad Knowles" <blk@skynet.be>, <tsikora@powerusersbbs.com>
Cc:        <freebsd-stable@FreeBSD.ORG>
Subject:   RE: Temperature Findings
Message-ID:  <000101bf53c4$1cf9c690$021d85d1@youwant.to>
In-Reply-To: <v04220800b4921b47e7a3@[195.238.23.239]>

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> At 10:27 PM -0800 1999/12/30, Mike Smith wrote:
>
> >  The difference has already been explained as a different
> instruction mix.
> >  This should be obvious to anyone that has been in the industry for as
> >  long as you have.
>
> 	It seems to me that you guys are all talking past each other:
>
> 		1.  He's mentioned that he runs the same instruction mix
> (i.e., two seti@home clients) under both Linux and FreeBSD

	Yes, Linux before he overclocked and overvoltaged and FreeBSD before.

> 		2.  He's mentioned that he's run FreeBSD in both
> uniprocessor
> and SMP modes

	Yes, UP uses HLT, SMP doesn't. With FreeBSD's SMP kernel, both processors
are always running full bore.

> 		3.  He's mentioned that he's run FreeBSD SMP with
> 3.3 without problems

	Before he overclocked and overvoltaged. Possibly also before his fan's
capacity decreased due to bearing failure or similar.

> 		4.  He's mentioned that the overclocking is a recent
> introduction to the issue and the system was overheating before then

	So he has cooling problems even at normal CPU voltages and frequencies.
Obviously, he either has inadequate cooling or he has some defective
component in his system that is creating too much heat.

> 		5.  He's also mentioned that this is a chipset which we now
> know is not directly supported by the measurement interface, and
> therefore the temperature multiples might (or might not) be off

	Okay, so we can't even trust his data as correctly indicating a temperature
problems. So, perhaps we know nothing at all.

[snip]
> 	Of course, the fact that everyone is talking past each other is
> not surprising, seeing as many of the correspondents are spread
> around the globe.

	There's nothing to explain or analyze. Much of his data comes from
unsupported (and unsupportable) configurations.

> 	If I might make a suggestion based on my own recent introduction
> to this mailing list -- it really helps if the new poster provides as
> much detail as possible and doesn't make any assumptions about how
> much they know about the problem based on their decade-plus (or more)
> experience, and it really helps if the other people involved give the
> guy at least half a break while he tries to explain what weirdo
> whacked out thing he's seeing.

	Seeing an overclocked, overvoltaged SMP system overheat is not exactly
weird or whacked out. It's specifically the reason most people do not
recommend overclocking or overvoltaging.

	DS



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