On 21.08.2013 17:03, Peter Grehan wrote: >> The way to go should be 4K clusters as they are native to the architecture. >> IIRC a PCIe DMA can't cross a 4K boundary anyway > > That's a 4G boundary, for some devices. I meant a single PCIe DMA transaction can be at most 4K before it has to set up another one? -- Andre