Date: Thu, 12 Aug 1999 09:22:02 +1000 (EST) From: Andrew MacIntyre <andymac@bullseye.apana.org.au> To: Greg Lewis <glewis@ares.maths.adelaide.edu.au> Cc: lyz@ems.guangzhou.gd.cn, freebsd-questions@FreeBSD.ORG Subject: Re: SMP and MEM Message-ID: <Pine.OS2.3.95.990812091556.337A-100000@CENTRAL> In-Reply-To: <199908110647.QAA81698@ares.maths.adelaide.edu.au>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, 11 Aug 1999, Greg Lewis wrote:
> > 2. The other question is my compaq 3000 server down again and again when MEM
> > increase to 1 G.
> > I have set the option in kernel like this:
> >
> >
> > options "MAXMEM=(1024*1024)"
> >
> >
> > appreciate for your help.
>
> Right. So you've compiled a kernel which insists that your machine has
> 1G of physical RAM yet you state above that it has 512 M. I'm guessing
> this is a Bad Thing [TM]. You only need to specify MAXMEM if FreeBSD
> isn't detecting the amount of RAM you have correctly.
Compaqs are a PITA. You have to do this to get any more than 16M usable.
I did think that the startup code still checked how much memory actually
existed (why is it called _MAX_MEM?).
There has however been an extensive thread in the last day or two on a
similar issue, with the observation that FreeBSD is known to work
reliably on machines with 1G of real memory, but that considerable
care/knowledge is required to find the right memory to actually get a
reliable system with 1G. There seem to be lots of electrical and memory
spec gotchas for many motherboards that claim to support this much memory.
--
Andrew I MacIntyre "These thoughts are mine alone..."
E-mail: andrew.macintyre@aba.gov.au (work) | Snail: PO Box 370
andymac@bullseye.apana.org.au (play) | Belconnen ACT 2616
Fido: Andrew MacIntyre, 3:620/243.18 | Australia
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.OS2.3.95.990812091556.337A-100000>