On 2014-08-05 07:40, martin f krafft wrote: > Hello, > > A NAS seems to be having RAM problems, leading me to want to swap > out DIMMs until I found the offender; I'd rather not go to the rack > every time I need to make a change. > > Is there a way to declare a DIMM unavailable to Linux with a boot > parameter? There is mem= and memmap= but i cannot figure them out. > > I have two 4Gb DIMMs in there and I just want to disable one, then > the other… > > This is the e820 physical RAM map: > > [ 0.000000] e820: BIOS-provided physical RAM map: > [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009e7ff] usable > [ 0.000000] BIOS-e820: [mem 0x000000000009e800-0x000000000009ffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000000e2000-0x00000000000fffff] reserved > [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000bff8ffff] usable > [ 0.000000] BIOS-e820: [mem 0x00000000bff9e000-0x00000000bff9ffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000bffa0000-0x00000000bffaa5ff] ACPI > data > [ 0.000000] BIOS-e820: [mem 0x00000000bffaa600-0x00000000bffdffff] ACPI NVS > [ 0.000000] BIOS-e820: [mem 0x00000000bffe0000-0x00000000bfffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000e0000000-0x00000000efffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x00000000ffa00000-0x00000000ffffffff] reserved > [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000022fffffff] usable > > But what do I do with those info? > The e820 is probably not what you want to be looking at. I would suggest looking into memory hot-plug/hot-remove support, IIRC the hot-remove support allows you to bring a bank offline.
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