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Old 06-26-2006, 04:27 PM   #1
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Registered: Jan 2006
Location: FRANCE
Distribution: opensuse
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lost memory with workstation


I have a custom workstation with all the parameters given on the bottom of my message.
I have 6 GB of RAM memory installed (8 slots are available) on my mainboard. BIOS identifies all 6 GB upon booting (!!! point), whereas Linux sees only 5 GB (:-((( ).
Should be noted, however, that 6 memory slots are attached nonsymmetrically according with the manual in order to have all 6 GB available (4 for one CPU and 2 for another one, 2 slots are still unused).
I've been running current installation since 4-5 months and it never found 6 GB after (re)booting.
I do not address this issue to the linux type/version, since I got the same with Fedora5-64bit and Debian-amd64.

If someone knows how to get the whole memory working, pls, let me know !!!

Thanks much

Running: Suse10 - 64bit
Kernel: 2.6.13-15.10-smp x86_64
Custom workstation:
2 x AMD Opteron 275, Tyan Thunder K8WE - S2895A2NRF (AMD-8000 + NVIDIA nForce Professional), NVIDIA GeForce 6600 GT 256 Mo TV-Out/DVI - PCI Express, SB Audigy SE
Old 06-26-2006, 05:53 PM   #2
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I suggest you run memtest86 from the installation CD (before booting the system). You may have a bad memory module.

I bought a custom built box a few months ago, and had problems from the first day because of two bad memory modules. Once the bad ram was replaced, everything worked fine.
Old 06-28-2006, 09:35 AM   #3
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Well, when I tried to check memory with the Suse CD "test memory" utility, I discovered that it again doesn't find all 6GB memory from the beginning of analysis, but displays only 5GB memory available.
Then, I tried to find out what's going on and step by step disassembled-reassembled all the memory wafles many times in different order trying to catch the bad one. All look operable and work itself (in pairs), both BIOS and linux identify them.
Interestingly, my SMP motherboard "likes" only some unique/compulsory combinations: e.g., sometimes when I rig 4GB (4 waffles) - only 3GB are seen both by BIOS and by linux, but each one works itself. Also, SMP mainboard doesn't like odd numbers, like 3 and 5 GB installed are seen as 2 and 4, respectively.
Weird... and perplexing.

Perhaps I have to purchase and rig the rest 2x1 GB wafles to get the whole of the memory available...


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