Date: Mon, 15 Aug 2005 20:58:09 +0200 From: Daniel Rock <freebsd@deadcafe.de> To: freebsd-amd64@freebsd.org Subject: Re: 4 GB RAM showing up as 3, BIOS memory hole and all that Message-ID: <4300E5C1.4030808@deadcafe.de> In-Reply-To: <20050815172250.GA32804@troutmask.apl.washington.edu> References: <20050815125657.A92343@cons.org> <20050815172250.GA32804@troutmask.apl.washington.edu>
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Steve Kargl wrote: > On Mon, Aug 15, 2005 at 12:56:57PM -0400, Martin Cracauer wrote: >>Any way to get my GB back? > > > This should be a FAQ. No, you can't get it back. > David O'brien has explained this more than once in > the freebsd-amd64 list. Unfortunately, I don't > have a handy URL for you to read. I suggest scanning > the list for posts by David in the Feb to May timeframe. > Hmm, on my board I could get the missing hole back. BIOS has three settings for memory hole remapping: Disabled/Hardware/Software (Hardware remapping should only work on stepping E-Opterons). With each of these settings I get different results: Hardware: 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: 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) Unfortunately, only if I cut memory below 4GB, my nve network adapter does work at all (ehm, mostly) - but that is another story... Daniel
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