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Date:      Tue, 7 Sep 1999 19:37:20 +0200 (CEST)
From:      Wilko Bulte <wilko@yedi.iaf.nl>
To:        peter@netplex.com.au (Peter Wemm)
Cc:        green@FreeBSD.ORG, aa8vb@ipass.net, mike@smith.net.au, hackers@FreeBSD.ORG
Subject:   Re: K6 Write Combining & FreeBSD
Message-ID:  <199909071737.TAA00842@yedi.iaf.nl>
In-Reply-To: <19990907101014.81C091CA8@overcee.netplex.com.au> from Peter Wemm at "Sep 7, 1999  6:10:14 pm"

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As Peter Wemm wrote ...
> Wilko Bulte wrote:
> > As Brian F. Feldman wrote ...
> > > On Sun, 5 Sep 1999, Randall Hopper wrote:
> > > 
...
> > > corrupt other memory...) For now, it's unsafe.
> > 
> > Maybe I'm missing the point here, but as a AMD user I'm interested anyway:
> > 'should be disabled', does that mean one has to 'hand hack' to disable it?
> > Stable being -stable I'd have guessed it should be disabled by default
> > if it is not 100% working like it should.
> 
> Uncomment the files.i386 line that adds k6_mem.c back to the build and it
> will be reactivated.  The problem is that it's been implicated as causing
> severe kernel (malloc and zone allocator) corruption when it's actually
> used, eg: when firing up XFree86 3.9.16.  The code is quite harmless when
> it's dormant though :-), but whem XFree86 4.0 gets released, it will cause
> RELENG_3 machines to die all over the place, which we don't need.

Which I really don't need ;-) But:

i386/i386/initcpu.c             standard
i386/i386/k6_mem.c              standard

in 

# $FreeBSD: src/sys/i386/conf/files.i386,v 1.220.2.12 1999/08/31 01:19:12
msmith

and

yedi#dmesg|grep -i mt
K6-family MTRR support enabled (2 registers)

in

yedi#uname -a
FreeBSD yedi.iaf.nl 3.3-RC FreeBSD 3.3-RC #0: Mon Sep  6 19:59:25 CEST 1999

I must have missed my system went from 3.2-STABLE to 3.3_RC with the
last cvsup/buildworld/installworld.

The question remains whether I should comment the k6_mem.c in files.i386

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


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