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Date:      Thu, 6 Apr 2000 19:01:56 +0100
From:      J McKitrick <jcm@freebsd-uk.eu.org>
To:        Brooks Davis <brooks@one-eyed-alien.net>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: bad memory patch?
Message-ID:  <20000406190156.B30755@dogma.freebsd-uk.eu.org>
In-Reply-To: <20000406101325.C10876@orion.ac.hmc.edu>; from brooks@one-eyed-alien.net on Thu, Apr 06, 2000 at 10:13:25AM -0700
References:  <20000406164114.B29984@dogma.freebsd-uk.eu.org> <20000406101325.C10876@orion.ac.hmc.edu>

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On Thu, Apr 06, 2000 at 10:13:25AM -0700, Brooks Davis wrote:
> On Thu, Apr 06, 2000 at 04:41:15PM +0100, J McKitrick wrote:
> > I saw this link recently...
> > 
> > http://home.zonnet.nl/vanrein/badram/
> > 
> > Apparently, you make a floppy with the supplied image, boot with it to
> > find the bad RAM addresses, and then those addresses are passed on as a
> > kernel parameter once the patch is applied.  Bad addresses will be excluded
> > from addressable/virtual memory from then on.
> > 
> > Sounds like sometheing we could use, eh?
> 
> Not really.  If you run it and it says the RAM is bad you know it's bad.
> If you run it and it says the RAM is good, then you whine and batch and
> moan for weeks, if not months, that FreeBSD is busted and your machine
> is perfectly functional until you finaly replace the RAM and the problem
> goes away.  This is not what we want to see.  The problem is that
> testing can't prove correctness because it can't try EVERY possiable
> access combination.

I think the concept here is that it allows you to use the bad RAM.  It's
like bad blocks on a hard drive.  SO now, if you think you have bad RAM, you
can run the test, mark the bad blocks, and memory will be allocated 'around'
them.

> P.S. The "you" in the above doens't refer to the poster, it refers to
> the poor sucker with a problem who tries to use this so called tool.

jm
-- 
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Jonathon McKitrick -- jcm@freebsd-uk.eu.org           To Microsoft:
"Your tyranny I was part of, is now cracking on every side.
Now your own life is in danger.  Your Empire is on fire." Front 242
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