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1b1ed1a
(Get the code!)
Hello,
reading in different forums I get more and more the idea that the IOMMU implementation in the GART driver is to blame.
To get back all your memory you can try the kernel option "iommu=soft" which forces a software emulated IOMMU to take over instead the AMD64 hardware IOMMU. Different people reported that this also fixes the problem without limiting the RAM. Btw. this is the default if you are using an Intel IA64 because this CPU has no hardware IOMMU.