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Branko Badrljica <brankob@××××××××××.com> posted |
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4A01A58C.2040908@××××××××××.com, excerpted below, on Wed, 06 May 2009 |
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16:58:20 +0200: |
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|
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> Duncan wrote: |
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>> Then, look at memory model. Here, with current kernels, I have only |
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>> one option, Sparse. However [some have the] Flat and Discontiguous |
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>> options as well. |
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|
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> I thought those extra options were just for NUMA systems and were about |
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> how the memory from several NUMA nodes "fits together" ie whether it has |
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> to form one continuos memory range or not. |
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|
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It's possible. The documentation on them is a bit limited, and I may |
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have inferred more than was justified from the fact that the options |
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there were so similar to the ones in my BIOS that (seemed to) control the |
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>4-gig memory layout. It's also worth noting that I DO have a NUMA |
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system here, so my somewhat trial and error method of finding what worked |
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for me included that factor as well, and I may have misattributed the |
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effects. |
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|
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Never-the-less, it was the two BIOS options and the two kernel options, |
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that together I tweaked, until I came up with a config that gave me use |
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of all of memory, the GART based IOMMU (without which I found I couldn't |
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boot at all with >4 gig addressable memory, because my SIL_SATA PCI-X |
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hardware and/or the kernel driver for it are evidently legacy-PCI and the |
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kernel would halt trying to access the disk in DMA mode addressing above |
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4G RAM), and NUMA. |
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|
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Oh, something else I found didn't work, but this is a chipset specific |
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errata I believe. AGP fast-writes simply don't work on this system. I |
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had to disable them both in the BIOS and in xorg.conf. That's something |
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else people might want to watch for. |
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|
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-- |
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Duncan - List replies preferred. No HTML msgs. |
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"Every nonfree program has a lord, a master -- |
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and if you use the program, he is your master." Richard Stallman |