[McG]

Llano GPU i ovisnost o sistemskoj memoriji

Compared to the original Redwood, Sumo underwent only two major changes. First, they modified the memory interface to ensure that the GPU can work with dual-channel DDR3 SDRAM via the processor North Bridge and not directly. Work with the memory sub-system is a traditional bottleneck of the integrated graphics cores, so when they put a high-speed GPU inside the new APU, they had to come up with some special optimizations. Unfortunately, Llano doesn’t have anything like Intel’s ring bus and Sumo can’t use processor cache-memory for its own needs. However, it boasts a different feature, which is totally new for a graphics core: it can write directly into the system memory skipping the processor cores. Moreover, all graphics core’s operations with the memory have higher priority in Llano processors than the requests from the computational cores, so they will be processed by the memory controller in the first place.

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