Date: Wed, 28 Sep 2005 07:10:30 -0700 From: David Kirchner <dpk@dpk.net> To: Nelis Lamprecht <nlamprecht@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Intel 2U server 4GB RAM showing only 3GB Message-ID: <35c231bf05092807105143e86e@mail.gmail.com> In-Reply-To: <7cbadc87050928020839d3dde8@mail.gmail.com> References: <7cbadc87050928020839d3dde8@mail.gmail.com>
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On 9/28/05, Nelis Lamprecht <nlamprecht@gmail.com> wrote: > Hi, > > I have a new dual Xeon Intel 2U server which I'm configuring with > FreeBSD 5.4 and I can't get it to see more than 3GB RAM. If I try use > the MAXMEM=3D(4096*1024) option it fails to boot up and just resets > itself. Do I need to use the PAE option ? ..I wouldn't think so as > this is meant for >4GB. Yeah, you'll need to use PAE. Some BIOS apparently remap the top few hundred megabytes (I've seen it use up to 768MB or so) for PCI (-X, -Express?) devices. FreeBSD 5.4-RELEASE, unpatched, has a bug that causes kernel panics when you use PAE and memory above the 4GB barrier is accessed. The bug is fixed in 5.4-STABLE, as of a while ago. I'm not sure if it made it back in to any of the 5.4-RELEASE-p?? patches.
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