Date: Wed, 30 Mar 2005 14:57:15 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: "Greg 'groggy' Lehey" <grog@FreeBSD.org> Cc: FreeBSD-amd64@FreeBSD.org Subject: Re: Problems with AMD64 and 8 GB RAM? Message-ID: <20050330225715.GA4816@troutmask.apl.washington.edu> In-Reply-To: <20050330224445.GW84137@wantadilla.lemis.com> References: <20050330222439.GU84137@wantadilla.lemis.com> <20050330223546.GA4705@troutmask.apl.washington.edu> <20050330224445.GW84137@wantadilla.lemis.com>
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On Thu, Mar 31, 2005 at 08:14:45AM +0930, Greg 'groggy' Lehey wrote: > On Wednesday, 30 March 2005 at 14:35:46 -0800, Steve Kargl wrote: > > On Thu, Mar 31, 2005 at 07:54:39AM +0930, Greg 'groggy' Lehey wrote: > >> None of these problems occur when I use 4 GB memory. About the only > >> strangeness, which seems to come from the BIOS, is that it recognizes > >> only 3.5 GB. If I put all DIMMS in, it recognizes the full 8 GB > >> memory. > >> > >> I realize that this isn't enough to diagnose the problem. The reason > >> for this message now is to ask: > >> > >> 3. Where should I look next? > > > > Have you run sysutils/memtest86 with the 8 GB? > > Heh. Difficult when the system doesn't run. That's what happens when 1 of 8 (1 of 4?) DIMM is bad :-) > > I had 4 bad out of 12 tested where the DIMMs were Crucial PC2700 2GB > > Reg. ECC DIMMs. > > OK, this makes sense. It might also explain why the 4 GB > configuration only recognizes 3.5 GB. Search amd64 mailing list. The missing memory is reserved for something which escapes me at the moment. Similar to the infamous ISA memory hole. -- Steve
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