Date: Mon, 21 Nov 2005 10:08:01 -0700 From: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> To: Daniel Rock <freebsd@deadcafe.de> Cc: current@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell Message-ID: <1513AD48-E08F-4670-A82B-E8D2D363F1E9@shire.net> In-Reply-To: <4381FE62.5040208@deadcafe.de> 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> <4381FE62.5040208@deadcafe.de>
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On Nov 21, 2005, at 10:05 AM, Daniel Rock wrote: > Chad Leigh -- Shire.Net LLC schrieb: >> 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? > > This is nothing unusual. I have a machine on which over 1.25GB is > mapped "out of the way". It is a Tyan Thunder K8WE (S2895). In BIOS > I can choose between Hardware/Software/Disabled mapping: > > > Hardware (requires E-stepping CPUs): > real memory = 5637144576 (5376 MB) > Physical memory chunk(s): > 0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages) > 0x0000000000985000 - 0x00000000a616ffff, 2776543232 bytes (677867 > pages) > 0x0000000100000000 - 0x000000014ffdffff, 1342046208 bytes (327648 > pages) > avail memory = 4109500416 (3919 MB) > > Software (should work regardless of stepping): > real memory = 6442450944 (6144 MB) > Physical memory chunk(s): > 0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages) > 0x0000000000985000 - 0x000000007ff1ffff, 2136584192 bytes (521627 > pages) > 0x0000000100000000 - 0x0000000174baffff, 1958412288 bytes (478128 > pages) > avail memory = 4085907456 (3896 MB) > > Disabled: > real memory = 2951872512 (2815 MB) > Physical memory chunk(s): > 0x0000000000001000 - 0x0000000000090fff, 589824 bytes (144 pages) > 0x0000000000983000 - 0x00000000aac56fff, 2855092224 bytes (697044 > pages) > avail memory = 2846003200 (2714 MB) Yes, but in your case the real memory is > 4gb so of course the amount mapped would be less. I have never seen on any of my motherboards, > 1Gb getting mapped when the physical memory is only 4GB Chad > > > > Daniel --- Chad Leigh -- Shire.Net LLC Your Web App and Email hosting provider chad@shire.net
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