On Tue, 11 Nov 2008, Yasunori Goto wrote: > But our box supports both of 32bit I/O and 64bit I/O without IOMMU. > Is it abnormal platform? New interface is necessary for our box like Altix? No its like x86 with the GFP_DMA zone for < 16M addresses. The special memory creates an imbalance that sometimes leads to weird VM behavior. I'd make sure to set GFP_DMA only for devices that actually require < 4GB memory and only use it if no IOMMU like stuff is available. Its best to not use GFP_DMA. -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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