Date: Sun, 20 Nov 2005 21:40:25 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Paul Saab <ps@freebsd.org> Cc: current@freebsd.org, "Chad Leigh -- Shire.Net LLC" <chad@shire.net>, Kris Kennaway <kris@obsecurity.org> Subject: Re: avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell Message-ID: <20051121034025.GD41629@dan.emsphone.com> In-Reply-To: <43813BBE.2010302@freebsd.org> References: <20051120183309.ysgk624asksckwow@mail.bafirst.com> <20051121004749.GA39061@xor.obsecurity.org> <43812AC7.3020506@rogers.com> <20051121020816.GA19252@xor.obsecurity.org> <C033B3B6-12A3-4428-A6B4-B51C6B09EB26@shire.net> <438136B5.9030506@freebsd.org> <20051121030915.GC41629@dan.emsphone.com> <43813BBE.2010302@freebsd.org>
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In the last episode (Nov 20), Paul Saab said: > Dan Nelson wrote: > >In the last episode (Nov 20), Paul Saab said: > >>Chad Leigh -- Shire.Net LLC wrote: > >>>I assume you are talking about the "phenomenon" of RAM "missing" > >>>due to PCI and other I/O mapping into the 4GB address space? What > >>>struck me about the OP is that the amount of RAM "missing" is more > >>>than I have ever seen due to this. My systems are usually > >>>3.4-3.6GB of RAM with 4GB installed, not 2.86GB (3005MB)... So > >>>are we sure that the PCI space mapping is the problem? > >> > >>Enable PAE and you'll get all your ram. > > > >Anyone know if it's possible for the kernel to determine if any RAM > >is mapped above the 4gb point and warn the user about how much > >memory is unaccessable without PAE? > > You mean like it does now? > "262144K of memory above 4GB ignored" That line didn't show up the the original poster's dmesg, though ( http://unixmania.com/dmesg_20051120.txt ). Maybe a verbose boot would shed more light. -- Dan Nelson dnelson@allantgroup.com
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