AMD is trading DMA containment for lower latency on its APUs, and it is on by default

T2Covered by 1 source · first reported by UploadVR / Road to VR / MIXED at 11 Oct, 05:54 UTC

AMD's integrated graphics will give up the IOMMU's containment of direct memory access by default in the next Linux kernel, and AMD wrote the trade down in its own commit message. "Arming PerfOpt trades IOMMU DMA containment for lower DMA latency," the amdgpu patch says. "This is enabled by default…