Date: Thu, 12 Aug 1999 20:37:56 +0930 (CST) From: Greg Lewis <glewis@ares.maths.adelaide.edu.au> To: Andrew MacIntyre <andymac@bullseye.apana.org.au> Cc: lyz@ems.guangzhou.gd.cn, freebsd-questions@FreeBSD.ORG Subject: Re: SMP and MEM Message-ID: <199908121107.UAA91478@ares.maths.adelaide.edu.au> In-Reply-To: <Pine.OS2.3.95.990812091556.337A-100000@CENTRAL> from Andrew MacIntyre at "Aug 12, 1999 09:22:02 am"
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> > > 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?). I'm still not convinced specifying MAXMEM _incorrectly_ is a good thing :). Certainly you sometimes need to specify the correct amount of memory if your BIOS is fibbing and FreeBSD can't work it out. > 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. Yep, have been following this thread on freebsd-stable :). -- Greg Lewis glewis@trc.adelaide.edu.au Computing Officer +61 8 8303 5083 Teletraffic Research Centre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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